Nexus 1262 / Electro Industries/GaugeTech. Installation & Operation Manual Version High Performance Socket and Switchboard Meters

Transcription

1 The Leader in Power Monitoring and Control

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3 Nexus 1262 / 1272 High Performance Socket and Switchboard Meters Installation & Operation Manual Version 1.10 August 5, 2008 Doc #: E V1.10 Electro Industries/GaugeTech 1800 Shames Drive Westbury, New York Tel: Fax: Sales@electroind.com The Leader in Power Monitoring and Control

4 Electro Industries/GaugeTech Doc # E151701

5 Nexus 1262 / 1272 Meter Installation and Operation Manual Version 1.10 Published by: Electro Industries/GaugeTech 1800 Shames Drive Westbury, NY All rights reserved. No part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopying, recording, or information storage or retrieval systems or any future forms of duplication, for any purpose other than the purchaser s use, without the expressed written permission of Electro Industries/GaugeTech Electro Industries/GaugeTech Nexus is a registered trademark of Electro Industries/Gauge Tech. Printed in the United States of America. e Electro Industries/GaugeTech Doc # E i

6 Customer Service and Support Customer support is available 9:00 am to 4:30 pm, eastern standard time, Monday through Friday. Please have the model, serial number and a detailed problem description available. If the problem concerns a particular reading, please have all meter readings available. When returning any merchandise to EIG, a return materials authorization number is required. For customer or technical assistance, repair or calibration, phone or fax Product Warranty Electro Industries/GaugeTech warrants all products to be free from defects in material and workmanship for a period of four years from the date of shipment. During the warranty period, we will, at our option, either repair or replace any product that proves to be defective. To exercise this warranty, fax or call our customer-support department. You will receive prompt assistance and return instructions. Send the instrument, transportation prepaid, to EIG at 1800 Shames Drive, Westbury, NY Repairs will be made and the instrument will be returned. Limitation of Warranty This warranty does not apply to defects resulting from unauthorized modification, misuse, or use for any reason other than electrical power monitoring. The Nexus Monitor is not a user-serviceable product. Our products are not to be used for primary over-current protection. Any protection feature in our products is to be used for alarm or secondary protection only. THIS WARRANTY IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESSED OR IMPLIED, INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. ELECTRO INDUSTRIES/GAUGETECH SHALL NOT BE LIABLE FOR ANY INDIRECT, SPECIAL OR CONSEQUENTIAL DAMAGES ARISING FROM ANY AUTHO- RIZED OR UNAUTHORIZED USE OF ANY ELECTRO INDUSTRIES/GAUGETECH PRODUCT. LIABILITY SHALL BE LIMITED TO THE ORIGINAL COST OF THE PRODUCT SOLD. Statement of Calibration Our instruments are inspected and tested in accordance with specifications published by Electro Industries/GaugeTech. The accuracy and a calibration of our instruments are traceable to the National Institute of Standards and Technology through equipment that is calibrated at planned intervals by comparison to certified standards. Disclaimer The information presented in this publication has been carefully checked for reliability; however, no responsibility is assumed for inaccuracies. The information contained in this document is subject to change without notice. This symbol indicates that the operator must refer to an explanation in the operating instructions. Please see Chapter 3, Hardware Installation, for important safety information regarding installation and hookup of the Nexus 1262/1272 meter. e Electro Industries/GaugeTech Doc # E ii

7 About Electro Industries/GaugeTech History Founded in 1973 by engineer and inventor Dr. Samuel Kagan, Electro Industries/GaugeTech changed the face of power monitoring forever with its first breakthrough innovation: an affordable, easy-to-use AC power meter. A few of our many Technology Firsts include: 1978: First microprocessor-based power monitor 1986: First PC-based power monitoring software for plant-wide power distribution analysis 1994: First 1 Meg Memory high performance power monitor for data analysis and recording 1999: Nexus series generation power monitoring with industry-leading accuracy 2000: First low profile socket meter with advanced features for utility deregulation Today Over thirty years later, Electro Industries/GaugeTech, the leader in Web-Accessed Power Monitoring, continues to revolutionize the industry with the highest quality, cutting edge power monitoring and control technology on the market today. An ISO 9001:2000 certified company, EIG sets the standard for web-accessed power monitoring, advanced power quality, revenue metering, artificial intelligence reporting, industrial submetering and substation data acquisition and control. EIG s products can be found on site at virtually all of today s leading manufacturers, industrial giants and utilities. World Leader In fact, EIG products are used globally and EIG is accepted as the world leader in power monitoring and metering technology. With direct offices in the United States, Turkey, Brazil, Mexico, Guatemala, Croatia and the Phillipines, EIG support is available in most regions around the world. Our worldwide support, advanced technology and quality manufacturing standards make EIG the superior choice when dependable, reliable service is paramount.. In recent years, General Electric has become the single largest corporate shareholder, with a 30+% share of EIG corporate holdings. All EIG products are designed, manufactured, tested and calibrated at our facility in Westbury, New York. Applications: Multifunction power monitoring Single and multifunction power monitoring Power quality monitoring On board data logging for trending power usage and quality Disturbance analysis Portable Analyzers: Power quality analysis Energy analysis e Electro Industries/GaugeTech Doc # E iii

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9 Table of Contents Quick Start Guide for Nexus Type S Meters Q-1 Chapter 1: Quick Start Up for Nexus S Type Meters 1.1: Start-Up and Bench Check : Meters with Auxiliary Power : Meters without Auxiliary Power : PC to Nexus Meter Serial Communications : Optical Port : Serial Communications : Program the Nexus Meter : Install Communicator EXT Software & Connect : Configure Programmable Settings : Device Profile Screens : Save the New Program : Field Installation Chapter 2: Nexus 1262/1272 Meter Overview 2.1: The Nexus 1262/1272 Multiparameter Power Meter : Accu-Measure TM Technology - Theory of Operation : Advanced Measurement Functionality : Advanced Revenue Billing Capability : Advanced Communications and I/O Capabilities : EN50160 Flicker : Display Screens : Additional Switches : Nexus External Output Modules : Optional P40N, P41N and P43N LED Remote Displays : Optional P60N Touch Screen Remote Display : Nexus 1262/1272 Meter Forms : Nexus 1262/1272 Meter Specifications Overview : Nexus 1262/1272 Meter Logging Specifications : DNP V3.00 Level Chapter 3: Operating Instructions for the Nexus 1262/1272 Meter 3.1: Nameplate Information : Basic Operations : Display Information : Nexus 1262/1272 Programmable Display Navigation Map : Programmable Display Overview : Programmable Display Setup : Programmable Display Screens Chapter 4: Testing for the Nexus 1262/1272 Meter 4.1: Testing Tools : Test Pulse LED e Electro Industries/GaugeTech Doc # E v

10 4.1.2: LCD Display : Test Mode : Entering Test Mode : Using Test Mode : Test Mode Preset Accumulators : Exiting Test Mode Chapter 5: Serial Communication Wiring 5.1: Communication Overview : Communicating to the Nexus meter through the ANSI Type II Optical Port : RS485 Serial Communication : RS485 Wiring Fundamentals (Port 1 & Port 4) : Using the Unicom : RS485 Connection - Meter to a Computer or PLC : RJ-11 (Telephone Line) Connection- Meter with INP2 Option to PC : RJ-45 Connection- Meter with INP200 (10/100BaseT) Option : Modem/Ethernet Connection- Meter with INP202 (Combo Card) Option : RS485 Connection- Meter to the P40N, P41N or P43N LED Display : RS485 Connection- Meter to the P60N Touch Screen External Display : Communication Ports on the Output Modules : RS485 Connection Meter to Output Modules : Steps to Determine Power Needed : Output Modules Factory Settings and VA Ratings : Remote Communication Over Telephone Lines Using the RS485 Port : Programming Modems for Remote Communication : Selected Modem Strings : High Speed Inputs Connection : IRIG-B Connections : Time Synchronization Alternatives : INP2 Internal Modem with Dial In/Dial Out Option 5.4.1: Hardware Overview : Hardware Connection : Dial-In Function : Dial-Out Function : INP200 Onboard Ethernet 5.5.1: Hardware Overview : Hardware Connection : INP202 Ethernet/Modem Combination 5.6.1: Hardware Overview : Hardware Connection Chapter 6: Hardware Installation 6.1: Mounting the Nexus Socket Meter : Cable Color Key : Internal Battery Installation and Maintenance : Battery Holder Detail : Battery Safety and Disposal : Mounting the Optional Nexus P40N, P41N or P43N LED External Display e Electro Industries/GaugeTech Doc # E vi

11 6.4: Mounting the Optional Nexus P60N Touch Screen External Display : Daisy Chain Meters with the P60N : Mounting the Nexus External Output Modules Chapter 7: Nexus Meter s Time of Use Feature 7.1: Introduction : The Nexus Meter s TOU Calendar : TOU Frozen & Active Registers : Updating, Retrieving and Replacing TOU Calendars : Daylight Savings and Demand Chapter 8: Transformer Loss Compensation 8.1: Introduction : Nexus 1262/1272 Meter s Transformer Loss Compensation : Loss Compensation in Three Element Installations : Three Element Loss Compensation Worksheet Chapter 9: Using the Nexus External Displays 9.1: Overview : Nexus P40N, P41N and P43N LED External Displays : Connect Multiple Displays : Nexus P40N Display Modes : Dynamic Readings Mode : Navigational Map of Dynamic Readings Mode : Nexus Information Mode : Navigational Map of Nexus Information Mode : Display Features Mode : Navigational Map of Display Features Mode : Nexus P60N Touch Screen External Display and Screens : Navigational Map for P60N Touch Screen External Display : Optional P40N, P41N, P43N LED External Display Specifications : Optional P60N Touch Screen Remote Display Specifications Chapter 10: Nexus External Output Modules 10.1: Hardware Overview : Port Overview : Installing Nexus External Output Modules : Power Source for Output Modules : Using Multiple Output Modules : Steps for Attaching Multiple Output Modules : Factory Settings and Reset Button : Analog Transducer Signal Output Modules : Overview : Normal Mode e Electro Industries/GaugeTech Doc # E vii

12 10.6: Digital Dry Contact Relay Output (Form C) Module : Overview : Communication : Normal Mode : Digital Solid State Pulse Output (KYZ) Module : Overview : Communication : Normal Mode : Specifications Chapter 11: Electrical Installation for Nexus 1262/1272 Meter (Type S) 11.1: Wiring Diagrams (Forms 9S, 36S and 45S) : 9S Meter Mounted in S/A Adapter Chapter 12: Nexus 1262/1272 Switchboard Meter (Type Z) 12.1: Introduction : Labels : Specifications and Dimensions : Installation : Wiring Diagrams (Forms 9Z and 36Z) Chapter 13: Nexus Meter Calculations 13.1: Measurements and Calculations : Demand Integrators Chapter 14: EN50160 Flicker 14.1: Overview : Theory of Operation : Setup : Software - User Interface : Logging : Polling : Log Viewer : Performance Notes e Electro Industries/GaugeTech Doc # E viii

13 Appendix A: Transformer Loss Compensation Excel Spreadsheet with Examples A.1: Calculating Values A-1 A.2: Excel Spreadsheet with Example Numbers A-1 Appendix B: Blade Configuration for Forms 9S, 36S and 45S B.1: 1262/1272 Forms B-1 B.2: Blade Configuration Drawings B-1 Appendix C: Three-Phase Power Measurement C.1: Three-Phase System Configurations C-1 C.1.1: Wye Connection C-1 C.1.2: Delta Connection C-3 C.1.3: Blondell s Theorem and Three-Phase Measurement C-4 C.2: Power, Energy and Demand C-6 C.3: Reactive Energy and Power Factor C-8 C.4: Harmonic Distortion C-10 C.5: Power Quality C-13 Glossary of Terms List of Figures Chapter 1: Quick Start Up for Nexus Type S Meters Figure 1.1: The Nexus 1272 Meter Figure 1.2: The Nexus 1272 Meter Rear View Diagram Figure 1.3: Form 9S & 36S Aux Terminals Figure 1.4: Form 45S Aux Terminals Figure 1.5: A7Z Communication Interface Chapter 2: Nexus 1262/1272 Meter Overview Figure 2.1: The Nexus 1272 Meter Figure 2.2: How the Nexus 1272 Meter Processes Inputs Figure 2.3: How the Nexus 1262 Meter Processes Inputs Chapter 3: Operating Instructions Figure 3.1: Nexus 1272 Meter Nameplate Figure 3.2: Nexus 1262/1272 Meter Switches and Indicators Chapter 4: Testing for the Nexus 1262/1272 Meter Figure 4.1: The Nexus 1272 Meter Chapter 5: Serial Communication Wiring Figure 5.1: Communication Overview Figure 5.2: Nexus 1272 Meter Optical Port Figure 5.3: A7Z Communication Interface Figure 5.4: 1262/ Wire RS-485 Port Detail Figure 5.5: RS485 Daisy Chain Connection e Electro Industries/GaugeTech Doc # E ix

14 Figure 5.6: Incorrect T and Star Topologies Figure 5.7: Unicom 2500 with Connections Figure 5.8: Detail of Jumpers Figure 5.9: Meter Connected to P40N, P41N or P43N LED External Display Figure 5.10: P60N Touch Screen Display Port Figure 5.11: Communication Ports on the I/O Modules Figure 5.12: Meter Connected to I/O Module Figure 5.13: Remote Connections-RS Figure 5.14: High Speed Inputs Connection Figure 5.15: IRIG-B Connection Chapter 6: Hardware Installation Figure 6.1: Nexus 1262/1272 Meter Mounting Dimensions Figure 6.2: Nexus 1272 Meter Rear View Diagram Figure 6.3: Nexus 1262/1272 MeterMounted in A-Base Bottom Figure 6.4: Nexus 1262/1272 Meter Mounted (Side View) Figure 6.5: Nexus 1272 Meter without Internal Shroud Figure 6.6: Battery Holder Detail Figure 6.7: Nexus P40N, P41N and P43N LED External Display Mounting Diagrams Figure 6.8: Nexus P60N Touch Screen Display Mounting Diagram Figure 6.9: Nexus P60N Display Back Detail Figure 6.10: Cutout for Nexus P60N Touch Screen Display Figure 6.11: Daisy Chain Meters with the P60N Touch Screen Display Figure 6.12: Nexus Output Modules Mounting Diagram, Overhead View Figure 6.13: Nexus Output Module Communication Ports Figure 6.14: Nexus Output Modules Mounting Diagram, Front View Figure 6.15: Nexus Output Modules with PSIO Mounting Diagram Figure 6.16: Output Wiring Detail Chapter 8: Transformer Loss Compensation Figure 8.1: Low Voltage Metering Installation Requiring Loss Compensation Figure 8.2: Joint Ownership Line Metering Requiring Loss Compensation Chapter 9: Using the Nexus External Displays Figure 9.1: Nexus P40N LED External Display Figure 9.2: Nexus P40N Display Daisy Chain Figure 9.3: Nexus P41N LED External Display Figure 9.4: Nexus P43N LED External Display Figure 9.5: Nexus P60N Touch Screen External Display Screen Captures for All Readings Chapter 10: Nexus External Output Modules Figure 10.1: Output Module Components Figure 10.2: Nexus Meter Connected to Output Module Figure 10.3: PSIO Power Source (Side View) Figure 10.4: Power flow from PSIO to Output Module Figure 10.5: Labels for the PSIO Power Source Figure 10.6: Multiple Output Modules e Electro Industries/GaugeTech Doc # E x

15 Chapter 11: Electrical Installation Figure 11.1: Form 9S Wye, no PTs, 3 CTs Figure 11.2: Form 9S Wye, 3 PTs, 3 CTs Figure 11.3: Form 9S 4-Wire Delta, no PTs, 3 CTs Figure 11.4: Form 9S 4-Wire Delta, 3 PTs, 3 CTs Figure 11.5: Form 9S 4-Wire Delta, no PTs, 2 CTs Figure 11.6: Form 9S 4-Wire Delta, 2 PTs, 2 CTs Figure 11.7: Form 9S 3-Wire Delta, no PTs, 2 CTs Figure 11.8: Form 9S 3-Wire Delta, 2 PTs, 2 CTs Figure 11.9: Form 36S 2.5 Element Wye, no PTs, 3 CTs Figure 11.10: Form 36S 2.5 Element Wye, 2 PTs, 3 CTs Figure 11.11: Form 45S Wye, no PTs, 3 CTs Figure 11.12: Form 45S Wye, 2 PTs, 3 CTs Figure 11.13: Form 45S 3-Wire Delta, no PTs, 2 CTs Figure 11.14: Form 45S 3-Wire Delta, 2 PTs, 2 CTs Figure 11.15: Form 45S 4-Wire Delta, no PTs, 2 CTs Figure 11.16: Form 45S 4-Wire Delta, 2 PTs, 2 CTs Figure 11.17: Form 9S mounted in an S/A Adapter Chapter 12: Nexus 1262/1272 Meter Switchboard Meter Figure 12.1: 1262/1272 Switchboard Meter, Front View Figure 12.2: Front View of the 1262/1272 Switchboard Meter Figure 12.3: Options Label for the 1262/1272 Switchboard Meter Figure 12.4: Switchboard Meter, Back View Figure 12.5: Switchboard Meter, Side View Figure 12.6: Switchboard Meter Cutout with Tolerance Figure 12.7: Front Case showing Built-In Screws Figure 12.8: Back Angle View of Switchboard Meter Figure 12.9: Form 9Z Wye, no PTs, 3 CTs Figure 12.10: Form 9Z Wye, 3 PTs, 3 CTs Figure 12.11: Form 9Z 4-Wire Delta, no PTs, 3 CTs Figure 12.12: Form 9Z 4-Wire Delta, 3 PTs, 3 CTs Figure 12.13: Form 9Z 4-Wire Delta, no PTs, 2 CTs Figure 12.14: Form 9Z 4-Wire Delta, 2 PTs, 2 CTs Figure 12.15: Form 9Z 3-Wire Delta, no PTs, 2 CTs Figure 12.16: Form 9Z 3-Wire Delta, 2 PTs, 2 CTs Figure 12.17: Form 36Z 2.5 Element Wye, no PTs, 3 CTs Figure 12.18: Form 36Z 2.5 Element Wye, 2 PTs, 3 CTs Chapter 14: Flicker Figure 14.1: Simulation of Eye Brain Response e Electro Industries/GaugeTech Doc # E xi

16 Appendix B: Blade Configuration Figure B.1: Form 9S & 36S Base with Knock Out Holes B-2 Figure B.2: Form 45S Base with Knock Out Holes B-2 Appendix C: Three-Phase Power Measurement Figure C.1: Three-Phase Wye Winding C-1 Figure C.2: Phasor diagram showing Three-phase Voltages and Currents C-2 Figure C.3: Three-Phase Delta Winding Relationship C-3 Figure C.4: Phasor diagram showing Three-phase Voltages, Currents, Delta Connected.. C-3 Figure C.5: Phasor diagram showing Three-phase, 4-wire Delta Connected System.... C-4 Figure D.6: Three-Phase Wye Load C-5 Figure C.7: Power Use Over Time C-6 Figure C.8: Energy Use and Demand C-8 Figure C.9: Voltage and Complex Current C-9 Figure C.10: Nondistorted Current Waveform C-10 Figure C.11: Distorted current wave C-11 Figure C.12: Waveforms of the Harmonics C-11 Tables Table 6.1: Cable Color Key Table 11.1: Nexus 1262/1272 Meter Forms (Type S) Table 12.1: 1262/1272 Switchboard Meter Forms (Type Z) Table C.1: Common Phase Voltages on Wye Services C-2 Table C.2: Power and Energy Relationship Over Time C-7 Table C.3: Typical Power Quality Problems and Sources C-13 e Electro Industries/GaugeTech Doc # E xii

17 Quick Start Guide for Nexus Type S Meters Q.1: Bench Check Bench Check saves field time. Q.1.1: Meters with Auxiliary Power Apply appropriate power to Auxiliary power cable. Display information scrolls. See Fig Hanger Q.1.2: Meters without Auxiliary Power Apply appropriate power to voltage terminals. Terminals are determined by Meter Form (on the front plate of the meter). For Forms 9S and 36S, connect power source to one of the three left most and to the right most voltage terminals (center row of smaller terminals). See Fig. 1.3 & 1.4. Q.2: PC to Meter Communications Q.2.1: Optical Port Connect with Modbus RTU, Connect SC-3 Smart Coupler (RS232) from Nexus meter s Optical Port to a PC s (9- or 25-pin) serial port (or) Q.2.2: Serial Communications Connect with Modbus RTU, Connect meter s Port 1 (or 4) (RS485) to PC's RS232 serial port via a Unicom RS485/ RS232 Converter. Q.3: Q.4: Install Communicator EXT Software & Connect Ethernet: Connect with Network, Modbus TCP, Modem: Connection Manager, Modbus ASCII, Configure Programmable Settings From Main Screen, click the Profile Icon. Communicator EXT displays the Meter's Initial Profile for editing. Before making changes, click SAVE to Save the Initial Settings as Initial Settings.NPS* on hard drive. Click on the (+/-) icon, double-click on the selected parameter. The screen appears. Make changes. Click OK. Then use buttons at the bottom of the screen to UPDATE DEVICE, SAVE, LOAD, print a REPORT or CANCEL. Section 1.5 reviews screens. SAVE the new NPS File as Modified Settings.NPS or as a unique identifying name (Example: Unique System ID or Customer s Name). Fig. Q.1: The Nexus 1272 Meter Fig. Q.3: 9S, 36S Aux Terminals Optional Aux Power Cable Voltage Terminals Common Fig. Q.2: 1272 Rear Diagram Fig. Q.4: 45S Aux Terminals Modem/ Ethernet Q.5: To implement changes, click UPDATE DEVICE. To LOAD a new or different file, select a file name. RESET ALL LOGS in Communicator EXT Main screen > Tools > Reset. Device Profile Screens General Settings Site Information (CT, PT Ratios) If you are using Block Demand, Transformer Loss Compensation, other than 15 minute demand, or Load Profile Recording (Trending in Communicator EXT) the Initial Settings should be changed. NOTE: Any change to CT settings will automatically update the corresponding Full Scale value in the Limit and Waveform Full Scales settings and will effect all other settings. NOTE: Make sure settings are correct for installation site. Fig. Q.5: 1262/1272 Device Profile Fig. Q.6: CT & PT Settings Electro Industries/Gauge Tech Doc # E Q-1

18 Limit & Waveform Full Scales These settings are based on a percentage of Full Scales, which are derived from the CT Ratios and can be changed without effecting accuracy. Be sure to set the CT Ratios first. Time Settings (not shown) (Initial Setting is - 5:00 Eastern Time) - 6:00 = Central Time - 9:00 Pacific Time - 7:00 = Mountain Time -10:00 Hawaii - 8:00 = Pacific Time -11:00 Midway Island Daylight Savings Time: choose from Disabled; Auto DST to enable pre-2007 Daylight Savings Time; User Defined, and Auto DST U.S. EPA 2005 to enable the standard U.S. DST schedule. Line Synchronization: Enable/Disable and choose Frequency. Communications Settings Ports 1 & 4 are programmable. Port 4 is INITIALLY SET for External Devices and can be changed. For Internal Modem & Network Options, set Advanced Settings & Dial Out Profile. Revenue & Energy Settings Block Average Demand Input settings for Demand Integration. Click OK. Display Configuration - Screen Assignments Use pull down windows to set up Display Modes & Screens. Power Quality & Alarm Settings Limits Double-click on a column or setting, change setting. Click OK. Waveform - CBEMA Profile (PQ Thresholds) Triggers for waveforms are set here based on a percentage of Full Scales (set on the Limit & Waveform Full Scales screen). Set Sampling Rate and Total Captures. Click OK. Trending Profile Settings Log Time Intervals (not shown) Set Intervals for Time Stamps from 1 second to 18 Hours. Based on Nexus time. Click OK. Time is set in the Tools Menu. Trending Setup for Historical Logs (not shown) Using pull down menus, select Type of Snapshot and Channel. Click Add or Remove. A running Total of Bytes Used appears on the screen. Click OK. NOTE: This guide is intended to be a brief tutorial for the Installation and Configuration of the Nexus 1262/1272 Power Meter. This guide does not purport to cover all details or variations in equipment. All work should be done by appropriate qualified personnel. For details, refer to later chapters & Communicator EXT User Manual. Electro Industries/Gauge Tech Doc # E Q-2

19 Chapter 1 Quick Start Up for Nexus Type S Meters The Nexus 1262/1272 Multiparameter Socket Meter can be installed in three ways: Type S Meter, Type A Meter (on an A Base) and Type Z Meter (in a Switchboard case). This Quick Start Guide is meant to give the field technician the basic steps for installation of the Type S Meter. Steps are detailed in later chapters of this manual. 1.1: Start-Up and Bench Check Power Up and Bench Check saves field time : Meters with Auxiliary Power If the meter has an Auxiliary Power cable (Fig. 1.2), apply appropriate power to the 2 leads of the power cable. Meter information scrolls on the display : Meters without Auxiliary Power To energize meters without Auxiliary Power, apply appropriate power to the voltage terminals of the meter. Terminals vary by Meter Form. The Nexus 1272 Meter Form (FM 9S, 36S, 39S or 45S) is shown in the white block under the display (Fig. 1.1). See Figures 1.3 & 1.4 to determine terminals. For Form 9S, 36S and 39S meters, connect appropriate power to the one of the three left most and to the right most voltage terminals (center row of smaller terminals). They are small, bold terminals in Figure 1.3. (The large terminals are current terminals for these Forms.) NOTE: Form 39S uses the same voltage terminals but the current terminals differ. Form 45S uses large terminals. Optional Aux Power Cable Cable 1 Port 1 Port 4 IRIG-B Cable 3 Optional KYZ Cable Figure 1.1: The Nexus 1272 Meter Cable 2 Cable to High Speed Inputs OPTIONAL COMMUNICATION Combo Modem / Ethernet Cable 4 RS-485 Gateway Cable 5 RJ-11 Modem Cable 6 RJ-45 Ethernet Modem Cable 4 RS-485 Gateway Cable 5 RJ-11 Modem Cable 7 Battery Ethernet Cable 6 RJ-45 Ethernet Figure 1.2: The Nexus 1272 Meter Rear View Diagram Voltage Terminals When the meter is energized, the display lights up and meter information scrolls on the display. This completes a 95% test of meter functionality. Fig 1.3: Form 9S & 36S Aux Terminals Common Fig 1.4: Form 45S Aux Terminals Electro Industries/Gauge Tech Doc # E

20 1.2: PC to Nexus Meter Serial Communications Use either of the two following methods: 1.2.1: Optical Port Connect with Modbus RTU, 9600 Baud Rate (Initial setting). The A7Z uses no power supply. All power is received from the host PC serial port via TX/RX circuits in the probe. Connect the A7Z at one end to the meter s Optical Port. At the other end, connect to a PC s RS232 serial port (9- or 25-pin) : Serial Communications Connect with Modbus RTU, Baud Rate. Connect meter s Port 1 (or 4) (RS485) serial communications port to PC's RS232 serial port via a Unicom RS485/RS232 Converter. Programming the Nexus Meter Programming the Nexus meter is much simpler than other high function meters. Here are some things you may find different about the Nexus meter: All functions operate simultaneously in the Nexus meter. You don t need to select which subset of functionality is needed for a particular application. The Nexus meter is shipped with Initial settings that allow it to operate. Programming consists primarily of modifying the Initial settings (Device Profile), as necessary. The key steps to programming a Nexus meter are: 1. Setting up communications. 2. Entering site information (CT and PT ratios). 3. Setting limits. 4. Selecting items to be displayed. 1.3: Install Communicator EXT Software & Connect See section 1.2 of Communicator EXT Manual for details. The setup process is simple - just insert a Communicator EXT CD into the disc drive; the software walks you through the installation process. If auto-start doesn't begin, use Windows Explorer: 1. Right-click Start Button and select Explorer. 2. Then select the drive with the Communicator EXT CD. 3. To start installation, double click "Communicator Setup.exe". Use Communicator EXT's Quick Connect (or Connect) function to set up the Communication link. The Command is: Connection > Quick Connect (or Connect). Ethernet Connection: Connect with Network, Modbus TCP, Modem: Connection Manager, Modbus ASCII, The Device Status Screen appears when the connection is complete. Fig 1.5: A7Z Communication Interface Electro Industries/Gauge Tech Doc # E

21 1.4: Configure Programmable Settings From the Communicator EXT Main screen, click the Profile Icon on the Tool Bar. Communicator EXT will copy the meter's initial profile into computer memory and display it for editing. NOTE: You have now completed a 98% verification of Meter Function. Before making changes, Save the Initial Settings as Initial Settings.NPS* on the hard drive by clicking Save. Click on the Group (+/-) icon, e.g., General Settings; then double-click the parameter you want to set. The setting screen for the parameter opens. Make changes as needed. Click OK. Then use the buttons at the bottom of the screen to UPDATE DEVICE, SAVE, LOAD, print a REPORT or CANCEL. Section 1.5 details the primary Device Profile screens. SAVE the new NPS File as Modified Settings.NPS or as a unique name to identify the file (Unique System ID or Customer s Name, for example). To implement changes, click UPDATE DEVICE. To LOAD a new or different file, select a file name. RESET ALL LOGS in Main screen>tools >Reset. 1.5: Device Profile Screens General Settings CT and PT Ratios and System Hookup Any change to CT settings will automatically update the corresponding Full Scale value in the Limit and Waveform Full Scales settings and will effect all other settings. NOTE: Chapter 4 of the Communicator EXT User Manual contains detailed instructions for programming options the Nexus 1262/1272 meter. If you are using Block Demand, Transformer Loss Compensation, other than 15 minute demand or Load Profile Recording (Trending) the default values should be changed. NOTE: Be sure to set the CT and VT ratios to values that are correct for the installation site. Electro Industries/Gauge Tech Doc # E

22 Limit and Waveform Full Scales These settings are based on a percentage of Full Scales, which are derived from the CT Ratios and can be changed without effecting accuracy. Be sure to set CT Ratios first. Time Settings (Initial Setting is - 5:00 Eastern Time) - 6:00 = Central Time - 9:00 Pacific Time - 7:00 = Mountain Time -10:00 Hawaii - 8:00 = Pacific Time -11:00 Midway Island Daylight Savings Time Settings and Line Synchronization Settings. See Chapter 4 of the Communicator EXT User Manual for details. Communications Settings Ports 1 and 4 are programmable. Port 4 is INITIALLY SET for External Devices and can be changed. - For Internal Modem (INP2) and Network (INP200) options, set Advanced Settings and Dial Out Profile. - For INP202, the INP202 Tab on the Advanced Settings screen accesses additional programming screens. See Chapter 4 of the Communicator EXT User Manual for details. When settings are complete, click OK to return to the Communications Settings screen. Click OK to return to the Main screen. Electro Industries/Gauge Tech Doc # E

23 Revenue & Energy Settings Block Average Demand Input settings for Demand Integration. Click OK. Display Configuration - Assign Screens Use pull down windows to set up Display Modes & Screens. Power Quality & Alarm Settings Limits Double-click on a column or setting, change setting. Click OK. Waveform - CBEMA Profile Triggers for waveforms are set here based on a percentage of Full Scales (set on the Limit & Waveform Full Scales screen). Set Sampling Rate and Total Captures. Click OK. Electro Industries/Gauge Tech Doc # E

24 Trending Profile Settings Trending Log Time Intervals Set Intervals for Time Stamps from 1 second to 18 Hours (based on Device time). Click OK. Device Time is set in the Tools Menu. Trending Setup for Historical Logs Using drop-down menus, select Type of Snapshot and Channel. Click Add or Remove. A running Total of Bytes Used appears on the screen. Click OK. See Chapter 4 of the Communicator EXT User Manual for details : Save the New Program Click the SAVE Button on the Device Profile screen and give your new program an identifiable name. 1.6: Field Installation You now have a tested meter with a program for the site where it will be installed. Meter installation is like any other meter of that Form. See Chapter 11 of this manual for Wiring Diagrams. Electro Industries/Gauge Tech Doc # E

25 Chapter 2 Nexus 1262/1272 Meter Overview Bar Code Infrared Test Pulse Example Screen Form Factor Diagram Mode (Reed) Switch Optical Port Test Button Under Cover Reset Switch Figure 2.1: The Nexus 1272 Meter 2.1: The Nexus 1262/1272 Multiparameter Power Meter The Nexus 1262/1272 transformer-rated, polyphase meter is a unique collection of metering technologies to fulfill advanced metering requirements. It provides high-accuracy power and energy measurements of voltage, current and all power values, data logging and power quality recording. The unit makes the data available through the display, connected systems and historic logs. 2.2: Accu-Measure TM Technology - Theory of Operation The advanced metering capability of the Nexus 1262/1272 device is a result of EIG s Accu-Measure TM Digital Sensing Technology. Accu-Measure TM technology is a combination of high-speed sampling, high-resolution measurement and high-speed calculation. All voltage and current waveforms are sampled and RMS values calculated continuously every cycle. Values of voltage, current and power are produced every three cycles and every second. Figure 2.2 illustrates the key processes operating within the Nexus 1272 meter. The meter allows for four types of inputs and can provide outputs to an integrated display, pulse outputs and several communication ports. Nexus 1262 meter processses are illustrated in Figure 2.3. Voltage and current signals enter the meter and are sampled at up to 256 samples per cycle. Each sample is resolved to a digital value using 16-bit analog-to-digital converters. Two 16-bit A/D converters are used for the 1272 (one for 1262). The first is for the real-time measurements. The second is for the waveform recorder. The use of two A/D converters ensures that both signals have maximum resolution, accuracy and integrity. The second also isolates energy sampling and calculations from the waveform fault recording requirements. This provides both advanced energy and advanced waveform analysis. Electro Industries/GaugeTech Doc # E

26 Figure 2.2: How the Nexus 1272 Meter Processes Inputs The digitized signals are then passed to the appropriate processor. Real-time measurements are calculated in one processor and made available for meter readings and historical logs. A separate processor performs waveform recording. Calculated data and logs are stored in memory for delivery to displays, external systems and download processes. The meter includes a time synchronizing input port that accepts an industry standard IRIG-B signal to synchronize meter time to standard universal time. If there is no IRIG-B signal, the meter uses a time synchronizing input port that uses line frequency to synchronize meter time to standard universal time. The Line Synchronization Feature may be Enabled or Disabled. If it is not Enabled, the Internal Clock provides time sychronization. All readings and logs are time stamped to the nearest millisecond. Eight status channels provide input of status or pulse signals. Status inputs are date/time stamped to the nearest millisecond and placed in the event log. Pulse inputs are multiplied by a user-supplied factor and accumulated in reading registers. These accumulated values can also be totalized. This feature makes the Nexus 1272 meter a good fit in universal metering applications. Any one input channel can be selected to accept an End of Interval pulse from another meter. Meter set-up parameters and all historical log data are stored in nonvolatile RAM. The user has multiple log functionality. Data is made available through the onboard display. Display screens are described in Section Several additional communication channels operate simultaneously, including the optional Ethernet/Modem Combo Card.. External systems can be connected to either of the RS485 ports or the Ethernet/Modem port. Stored data can be downloaded through the RS485 ports, the Ethernet/Modem port or the IR port. Electro Industries/GaugeTech Doc # E

27 Figure 2.3: How the Nexus 1262 Meter Processes Inputs Voltage and current signals enter the meter and are sampled at up to 256 samples per cycle. Each sample is resolved to a digital value using a 16-bit analog-to-digital converters. The 16-bit A/D converter is for the real-time measurements. The Nexus 1262 meter does not have a second converter for ITIC/CBEMA Log or Waveform recording. The meter includes a time synchronizing input port that accepts an industry standard IRIG-B signal to synchronize meter time to standard universal time. If there is no IRIG-B signal, the meter uses a timesynchronizing input port that uses line frequency to synchronize the meter time to standard universal time. The Line Synchronization Feature may be Enabled or Disabled. If this feature is not Enabled, the Internal Clock provides the time sychronization. All readings and logs are time stamped to the nearest millisecond. Meter setup parameters and all historical log data are stored in nonvolatile RAM. The user has multiple log functionality. Data is made available through the onboard display. Display screens are described in Section Several additional communication channels operate simultaneously, including the optional Ethernet/Modem Combo Card (separate connections that can be used simultaneously). External systems can be connected to either of the RS485 ports or the Ethernet/Modem port. Stored data can be downloaded through the RS485 ports, the Ethernet/Modem port or the IR port. Electro Industries/GaugeTech Doc # E

28 2.3: Advanced Measurement Functionality 2.3.1: Advanced Revenue Billing Capability The Nexus 1262/1272 device is a full four-quadrant power meter with accuracy of within 0.06% of reading. Energy measurements include: kwh Delivered & Received, kvarh Delivered & Received, kvah, kvarh, kwh in each quadrant and Total kvah. The meter measures instantaneous power and provides multiple, simultaneous demand measurements, including time-stamped maximum and minimum readings. Time of Use The Nexus meter s Time of Use functionality offers the following standard capabilities: 8 TOU Schedules Bidirectional Consumption and Demand 4 Seasons/Year 20 Year Calendar Prior Month and Prior Season Readings for each Schedule Present Month and Present Season Readings for each Schedule Total to Date Readings for each Month Total to Date Readings for each Season Cumulative and Continuous Cumulative Demand Load Aggregation/ Universal Metering Using standard pulse inputs, the Nexus 1262/1272 meter can count pulses from external meters and accumulate usage. The pulse inputs can be used to totalize electrical usage and utility values, such as water or gas use data. Readings include: 8 Pulse Inputs Individual Accumulating Registers 4 Totalizing Registers Totalize with Nexus meter kwh Readings Multiple Demand Windows The Nexus 1262/1272 meter simultaneously monitors four demand structures. The unit offers: Block Window Demand Rolling Window Demand Predictive Demand Thermal Demand Interval Length from 1 second to many hours Up to 15 Sub-Intervals End of Interval Pulse Output (with Optional 4IPO Internal KYZ capability) End of Interval Pulse Input Time Stamped Max/Min Demands The unit gathers Time Stamped Max/Min Demands for all power values. Each of the following values is date/time stamped: kw Demand, Delivered & Received, Max/Min kvar Demand, Delivered & Received, Max/Min kvar Coincident with kw Demand kva Demand, Max/Min Amps Demand, Max/Min Voltage Demand Max/Min Electro Industries/GaugeTech Doc # E

29 Transformer Loss Compensation Transformer Loss Compensation adjusts for both copper and iron losses with a simple user setup : Advanced Communications and I/O Capabilities The Nexus 1262/1272 meter features advanced communication which utilizes multiple com ports using open protocols. The meter s multi-port design allows multiple communication connections simultaneously. The Nexus 1262/1272 system provides a direct digital link to your customer, allowing selected data to be gathered without affecting the meter or your data. All of the advanced features of the 1262/1272 are made available through industry-standard Modbus and DNP 3.0 protocols. No proprietary or closed protocols are used. Standard Communications ANSI Type 2 Optical Port (IR Port) 2 RS485 Serial Ports Modbus RTU/ASCII Protocol DNP 3.0 Level 2 + Protocol Speeds up to 115k bps Optional Communicaions The Nexus 1262/1272 meter allows you to select an additional port for one of the following uses: INP2: Internal 56k Modem with noise rejection INP200: Internal Ethernet TCP/IP (10/100BaseT) with multiple sockets and Modbus TCP. INP202: Combination 56k Modem and Internal Ethernet TCP/IP (10/100BaseT) Standard Internal I/O Extensive I/O capability is available in conjunction with all metering functions. IRIG-B Time Synchronizing to GPS to 1 millisecond resolution. 8 High-Speed Status Inputs for status detect or of load aggregation/universal metering inputs. Line Frequency Time Synchronization Internal I/O The meter offers four optional KYZ Pulse Outputs which can be programmed to pulse for any accumulated reading. One of the pulse outputs can also be set for an End-of-Interval Sync Pulse. Upgradeable External Output Modules The user can select from the following optional Output Modules for enhanced capability. Analog Outputs KYZ Outputs Relay/ Alarm Outputs Control Options ElectroLogic TM provides user-definable control outputs. Action and/or alarm on Abnormal Condition. Action on Boolean Logic Combinations. Electro Industries/GaugeTech Doc # E

30 2.3.3: EN Flicker The Nexus 1272 meter provides EN50160 Flicker evaluation in Instantaneous, Short Term and Long Term forms. For a detailed explanation of Flicker, see Chapter 14 of this manual : Display Screens The Nexus 1262/1272 meter features a built-in graphical back-lit FSTN LCD display with extended temperature voltage compensation. This allows you to view energy data and to gather circuit diagnostic data such as voltage, current, harmonics and phasor information. This display is easily programmable. An example of a programmed screen is shown here. The Programmable Display is covered in detail in Chapter 3 of this manual : Additional Switches The Nexus 1262/1272 meter has additional switches & signals that help in using the unit (Fig. 2.1). The Infrared Test Pulse can be set to pulse for +Watt-hour, -Watt-hour, +VAR-hour, -VAR-hour and VA-hour. The pulse uses a time-modulated pulse integration which allows the pulse to be accurate during short duration pulse tests. The pulse integration uses industry-accepted reference standards. The Mode Switch (magnetic reed switch) uses a magnet to switch operating modes. The Test Button. The Reset Button : Nexus External Output Modules A variety of optional analog or digital Output modules mount externally to the Nexus 1262/1272 Socket Meter. The Nexus 1262/1272 Unit DOES NOT SUPPLY POWER TO Output Modules. Use a power supply, such as EIG PSIO, to power optional Output Modules. See Chapter 10 for details on installation and use of the Nexus External Output Modules : Optional P40N, P41N and P43N LED Remote Displays The Nexus 1262/1272 Socket Meter features a back-lit LCD display built into the face of the meter. In addition, Electro Industries offers four optional external displays, each powered by a power supply (such as the PSIO). The P40N, P41N and P43N are LED displays which provide easy-to-use access to information stored in the meter when an additional display is required for remote access. See Chapter 9 for further details : Optional P60N Touch Screen Remote Display The P60N is the Touch Screen Display which also provides easy access to meter readings and data when an additional display is required. The P60N presents this data on a graphical touch screen.the P60N requires an additional power source, such as the PSIO. See Chapter 9 for further details. Electro Industries/GaugeTech Doc # E

31 2.4: Nexus 1262/1272 Meter Forms The Nexus 1262/1272 Socket Meter offers three supported S-Based Meter Forms based on the rated voltage and hookup required by the user. Below are the form specifications. Form 9S can be ordered in an A-Base (Order Form 9A). See Chapter 11 for corresponding Wiring diagrams and Appendix B for Blade configurations. The Switchboard Meter offers two supported Z-Based Forms, 9Z and 36Z (see Chapter 12). NOTE: Form 45S replaces Form 5S and may also be used in 4-wire circuits. Nexus 1262/1272 Meter Forms Form 9S 36S 45S Hookup 3E Wye or Delta 2 1/2E Wye 2 1/2E Wye or 4W Delta NOTE: See Section 2.5 for Rated Voltages. Nexus 1262/1272 Meter Accuracy Value Accuracy Voltage 0.02% Current 0.05% Frequency 0.001Hz kw 0.06% kwh@1.0pf 0.06% kwh@0.5pf 0.10% kvar 0.10% kva 0.10% PF 0.10% Electro Industries/GaugeTech Doc # E

32 2.5: Nexus 1262/1272 Meter Specifications Overview Sense Input Voltage Rated 0 to 332 Volts line-to-neutral; 0 to 480 Volts line-to-line. Operating 96 to 332 Volts line-to-neutral; 155 to 576 Volts line-to-line. Input Voltage - Self-Powered Option Power Supply Rated 96 to 332 Volts line-to-neutral; 155 to 576 Volts line-to-line. Input Voltage - Low Voltage Power Supply Rated 30 to 90 Volts line-to-neutral; 52 to 155 Volts line-to-line. Input Current Transformer Rated Continuous 120% of meter class. Defined as Class 20 (Class 2 and Class 10 Available). Nominal current rating: 5A for Class 20 and 10 meters; 1A for Class 2 meters. Overload 500% for 1 second, non-recurring. Three or four current inputs depending on form (IA, IB, IC and IN). Frequency Hz. Burden (Sense Inputs) Voltage Inputs: 0.33VA@576V. Current Inputs: VA@25A. Isolation All inputs and outputs isolated to 2500 Volts. Com Ports isolated from each other to 1000 Volts. Sensing Accu-Measure TM Technology. 2x16-bit A/D converter (1272). 1x16-bit A/D Converter (1262). True RMS. 8-Channel Sample and Hold. Memory All meter setup parameters, measurements and logs contained in nonvolatile RAM. Compliance ANSI C12.20 Class 0.2 and IEC60687 (Accuracy). ANSI C (Surge Withstand). ANSI C62.41 (Surge Immunity). ANSI C12.18 (Optical Port). IEC (Flicker) (1272). Standard Communications LCD Display. ANSI Type 2 Optical Port (IR Port). Two RS485 Serial Ports. Modbus RTU, Modbus ASCII and DNP 3.0 protocols. Data Speeds of up to 115k bps. Optional Communications INP2: Internal Modem with data buffering for faster downloads and noise rejection.connect speeds of 300 to 56k bps. INP200: Internal 10Mbit Ethernet. INP202: Ethernet (INP200) / Modem (INP2) Combination Electro Industries/GaugeTech Doc # E

33 Internal 8-Channel Digital KYZ Pulse/Status Inputs Type: Self-excited, for dry contacts only. Wetting Voltage: 12V dc typical. Internal 4-Channel KYZ Outputs Type: Form C. On Resistance: 23-35Ω. Peak Voltage: 350V dc. Continuous Load Current: 120mA. Peak Load Current: 350mA (10ms). Off-State Leakage dc : 1 µa. Opto Isolation: 3750Vrms (60 Hz, 1 min.). Timing IRIG-B input for synchronizing to external GPS clock signal. Line Frequency Synchronization. Internal Clock. Environmental Operating Temperature: (-40 to +85) C. Display Operating Temperature: (-20 to +70) C. Humidity: 95% non-condensing. Storage Temperature: (-40 to +85) C. Lexan Cover. Power Supply (Unit is powered by 3-Phase Voltage Sense Inputs.) (96 to 550)V ac 50/60Hz (576V ac absolute maximum), Autoranging 3-Phase Power Supply. Meter power requirement 120V ac worst case. Meter power provided by any of the 3-Phase voltage sources being monitored. Aux Power Supply Option (Unit is powered by Aux Pigtail Wire.) Select Power Supply Option SE in ordering information. Input Voltage: 102 to 270V AC/DC 50/60Hz Maximum Power Consumption: 12VA@276V ac. Security Hardware lock secures meter settings. Two 10-character passwords. One password controls access to read meter digitally. Separate password controls access to program meter. Internal Battery Panasonic BR2032 3V Lithium Battery (or equivalent) maintains NVRAM and time during outages. Modem Battery 3V Lithium Battery with custom leads and velcro mounting maintains Dial-Back Feature during outages. Call factory for replacement battery. Electro Industries/GaugeTech Doc # E

34 2.6: Nexus 1262/1272 Meter Logging Specifications Model Memory Historical Log 1 1 Historical Log 2 1 CBEMA/ ITIC 2 Event Log 2 Waveform Log 3 Flicker Log 2 Output Log 2 Input Log 2 System Events Standard 85 Days 133 Days Advanced 555 Days 133 Days Model Memory Historical Log 1 1 Historical Log 1 1 CBEMA/ ITIC 2 Event Log 2 Waveform Log 3 Flicker Log 2 Output Log 2 Input Log 2 System Events Standard 69 Days 32 Days N/A 512 N/A N/A Advanced 480 Days 133 Days N/A 512 N/A N/A Logging Specifications Footnotes 1. Assuming Log is storing 4 readings every 15 minutes. 2. Number of Events Recorded (assumes 14 parameters monitored). 3. Number of Waveform Records. Each record may be from 8 to 64 cycles in duration, depending upon meter setup. 2.7: DNP V3.00 Level 2 Nexus 1262 and 1272 meters support DNP V3.00 Level 2. DNP Level 2 Features: Up to 136 measurements (64 Binary Inputs, 8 Binary Counters, 64 Analog Inputs) can be mapped to DNP Static Points (over 3000) in the customizable DNP Point Map. Up to 16 Relays and 8 Resets can be controlled through DNP Level 2. Report-by-Exception Processing (DNP Events) Deadbands can be set on a per-point basis. Freeze Commands: Freeze, Freeze/No-Ack, Freeze4 with Time, Freeze with Time/No-Ack. Freeze with Time Commands enable the Nexus meter to have internal time-driven Frozen and Frozen Event data. When the meter receives the Time and Interval, the data will be created. For complete details, download the appropriate DNP User Manual from our website Electro Industries/GaugeTech Doc # E

35 Chapter 3 Operating Instructions for the Nexus 1262/1272 Meter 3.1: Nameplate Information The Nexus 1262/1272 Socket Meter has its operating information represented on the nameplate, which is located on the face of the meter. See Figure 3.1 below for a graphical representation of the 1272 meter s nameplate. Serial and Model Numbers are on the Options Label (see next page). User Defined Area Graphical Liquid Crystal Display PERFORMANCE ENHANCED Form Factor Diagram Mode Switch Figure 3.1: Nexus 1272 Meter Nameplate KEY: The numbered list below acts as a key for the label above: 1. Multiply by Constant 6. Test Amperes 2. Voltage Transformer Ratio (or PT Ratio) 7. Watt-hour test constant 3. Current Transformer Ratio (see Glossary) 8. ANSI C12.20 Form Number 4. Primary Watt-hour constant 9. ANSI C12.20 Accuracy Class 5. Current class Electro Industries/GaugeTech Doc # E

36 The Options Label is located on the outside of the internal shroud. It is prepared specifically for each meter and shows the ordered options that are included in the meter. An example of a typical label is shown above. Below is a list of options available for the meter: Memory (1272): Memory (1262): S (Standard) 2M of RAM S (Standard) 512K of RAM A (Advanced) 4M of RAM A (Advanced). 2M of RAM Output Modules: 1mAON4 4 Analog Outputs, 0-1mA 1mAON8 8 Analog Outputs, 0-1mA 20mAON4 4 Analog Outputs, 4-20mA 20mAON8 8 Analog Outputs, 4-20mA 4RO1 4 Relay Outputs 4PO1 4 Solid State Pulse Outputs Communication Options: INP2 - Dial Out Option INP200 - Ethernet 10/100BaseT INP202 - Ethernet/Modem Combination EIG Number: Model Number plus Option Numbers: (Example below) Model - Memory - Form - Freq - Power Supply - Outputs - Communication A - 9S - 60Hz - S - 4PO1 - INP200 Electro Industries/GaugeTech Doc # E

37 3.2: Basic Operations Infrared Test Pulse Activate Mode (Reed) Switch with a Magnet swiped on the side of the meter. Mode (Reed) Switch Optical Port Test Button Under Cover Reset Switch Figure 3.2: Nexus 1262/1272 Meter Switches and Indicators Switches and Indicators There are two switches accessible from outside the meter cover. 1. The Mode Switch (also called a Reed Switch) is used to switch from Normal Mode to Circuit Diagnostic Mode or Time of Use Mode. 2. The Reset Switch is used to reset demand. A third switch, the Test Button, is accessible only when the cover has been removed. The Test Button switches the meter from one of the operational modes to Test Mode and back to Normal Mode. The Test Button is also used to access Display Adjustments Mode during Powerup Mode. The Display Adjustments Mode is discussed in Section 3.5. The Optical Port is on the lower left side of the face. The Optical Port facilitates infrared communication with the meter. Using an A7Z Communication Interface (or other ANSI C12.13 Type II magnetic optical Communications coupler) and an RS232 cable from the A7Z to a PC, you can program the meter with Communicator EXT software. An Infrared Test Pulse is located on the upper left side of the face. Energy pulsing applications can be configured using Communicator EXT software. A Phase Indicator is located on the lower right side of the face. ABC will stay illuminated if all three phases of voltage and current are present. ACB indicates reversed phase sequence. It will blink A, B or C if one phase is not present. If all phases are not present, the meter will turn off (unless you have an Aux pigtail connected to a power source). Electro Industries/GaugeTech Doc # E

38 3.3: Display Information The Nexus 1262/1272 meter uses a graphical back-lit FSTN LCD Programmable Display with extended temperature voltage compensation. This allows you to view energy data and to gather circuit diagnostic data such as voltage, current, harmonics and phasor information. A wide range of values can be defined for display using the User Modes and screens in the Programmable Display and Communicator EXT software. Three View Modes, plus Test Mode and a Select Compensation Screen allow tremendous flexibility in setting up the Display modes and the screens within the modes. View Modes are user created with up to 16 screens each, which display in auto sequence every 7 seconds. Most of the screens have a Status Bar across the bottom which displays the date, time and phase (if there are inputs). View Mode 1 is the primary mode. The other modes will automatically return to View Mode 1 after a user-set amount of time from last user action. Low Battery Lo Batt - NVRam (Internal Battery) or Lo Batt - Modem (Modem Battery) will flash on the screen being displayed every seconds ONLY when the Internal (or Modem) Battery is running low or when it is not clicked into place properly. If the batteries are not low, NO INDICATOR will appear. See installation instructions in sections 6.2 and Test Mode Wh Test - Same as kwh screen, except in Wh instead of kwh VARh Test - Same as kvar screen, except in VARh (Quadrants) VAh Test - Same as kvah screen,except in VAh (Quadrants) Watt Rolling Demand Test (Delivered and Received) Watt Block Demand Test (Delivered and Received) Initial Display Screens The Nexus 1262/1272 meter is shipped with Initial Display Screens, which will scroll on the display as soon as you power up the meter. The Initial Display Screens are a sampling of the many screens available for the Programmable Display, which is detailed in sections 3.4 to 3.7. Typical Initial Display Screens: Meter Data, including Boot, Run, DSP Boot, DSP Run, Serial Number, Protect Enabled, Baud Wh Delivered kvarh per Quadrant Rolling W Demand Delivered Block W Demand Delivered W Demand Last Reset Wh Received kvah per Quadrant Rolling W Demand Received Block W Demand Received Cumulative W Demand Backlight The Backlight cannot be set to stay on indefinitely. It will turn off after the amount of time selected. One hour is the maximum setting. If the backlight has timed out and is off, you need to hit the Mode Switch once to turn on the backlight and redirect the screen automatically. Electro Industries/GaugeTech Doc # E

39 3.4: Nexus 1262/1272 Meter Programmable Display Navigation Map Electro Industries/GaugeTech Doc # E

40 3.5: Programmable Display Overview The Programmable Display has three configurable modes with up to 16 screens each. The three modes are displayed in auto sequence every 7 seconds. Using Communicator EXT, you can assign up to 16 screens to each mode: any of the available screens can be used in any mode. You can also assign a three-digit label to the mode. The three modes are: Configurable View Mode 1 - Replacing Normal Mode Configurable View Mode 2 - Replacing Circuit Diagnostic Mode Configurable View Mode 3 - Replacing Time of Use Mode This feature allows you to determine what data will be displayed and in what order on the display. Larger (.56 ) digits are displayed on many of the screens so that data is much easier to read. View Mode 1 is the primary mode. The other modes, View Mode 2 and View Mode 3 are accessed by swiping the Mode Switch twice. Test Mode is accessed by removing the cover (POWER MUST BE OFF), powering up the meter and pushing the Test Button at any time. View Mode 2 and View Mode 3 will automatically return to View Mode 1 after a user-set amount of time without any action. Test Mode will automatically return to View Mode 1 after an amount of time since the last user action with no energy accumulation (or) an amount of time since the last user action plus the demand interval with energy accumulation. The values for the amount of time since the last user action are set in the Miscellaneous screen of the User Inactivity Time Outs section. The Programmable Display can be edited through Communicator EXT even if the meter is not connected to the computer. Refer to the next section (Section 3.6) for instructions. See the Communicator EXT User Manual for additional details on programming and polling the Nexus 1262/1272 meter. e Electro Industries/GaugeTech Doc # E

41 3.6: LCD Programmable Display Setup 1. From the Communicator EXT Main screen, click Tools>Edit LCD Programmable Settings. 2. You will see the screen shown on the. right.use the tabs at the top of the screen to navigate to different setting screens. 3. Click the Meter Display Mode Names tab. a. Enter a three-letter label for each of the three View Modes. b. Enter a description for each mode using the Line 1 and Line 2 Description fields. 4. Click the Screen Assignments tab. a. Double-click on the screen you want to change. b. Enter up to 16 screens under each mode on the screen. Your Label for each mode will appear at the top of each column. 5. Click the Power and Energy Display tab. Enter settings for Power and Energy: Number of Digits: 4-9 (Primary Power). Decimal Point Location: 0-3 (Primary Power) Display Leading Zeroes: check if desired. Energy Display: Select the Multiply by Constant value. Check Apply to the Demand Registers as Well if desired. A Preview appears at the bottom of the screen. eelectro Industries/GaugeTech Doc # E

42 NOTES: Settings on this screen control the display of energy related numbers. Care should be given to match the values on the display with those in the historical logs. These settings apply to VA-hours, watt-hours(+/-), VAR-hours (+/-) and VAR-hours (each quadrant) in the meter. This Number of Digits setting controls the display and storage of all digits displayed on the screen, and it sets the Register Rollover for all energy-type registers. 6. Click the Miscellaneous tab. The Screen settings replace Adjustments Mode in the default Device profile.. a. Enter settings in the Miscellaneous screen: Screen Settings: Back Light Level: 0-Off to 4- Brightest Back Light Time (Back Light shuts off): 00min, 30sec - 60min, 00sec Contrast: 0 - Highest to 7 - Lowest Scroll Stop: Enabled or Disabled Phasor Rotation: Clockwise or Counterclockwise Demand Shown: Cumulative or Continuous Cumulative Time of Use Demand:Block/Rolling or Cumulative Date Format: Month/Day/Year or Day/Month/Year Optical Port Settings: Baud Rate: 1200, 2400, 4800, 9600, 19200, or Optical Receive: Non-Inverted or Inverted User Inactivity Time Outs (number of minutes since last user action when Mode reverts to View Mode 1) (Settings are 5 to 60 minutes with 1 minute intervals.): Leave Test Mode After _ Minutes: Reverts with or without energy accumulation. Leave View Mode 2 After _ Minutes: Reverts automatically. Leave View Mode 3 After _ Minutes: Reverts automatically. 7. Use Buttons for Functions below: Update Display: Click to send the new settings to the display. (After settings have been updated, View Mode 1 is displayed.) Retrieve from Display: Click to Retrieve existing settings. Cancel: Click to Cancel any new settings, return to Communicator EXT Main screen. Save: Click to Save new settings to a file. 9. When you have finished making any changes, click Update Display to send the new settings to the display. Pop-up windows will tell you that the changes have been made and you will return to the Communicator EXT Main screen. eelectro Industries/GaugeTech Doc # E

43 3.7: Programmable Display Screens The Nexus Programmable Display screens have some features that make them very user friendly: 1. Many of the screens have larger digits (.56 ) which are more legible. 2. There are more screens from which to format your data. 3. The Polling Indicator in the right corner of the Status Line provides two functions: A. A blinking indicator shows that the display is receiving data from the meter. B. Power Flow is displayed by different shaped icons. 1. When no power is flowing, a solid block is displayed. 2. An animated arrow pointing RIGHT indicates positive power flow. 3. An animated arrow pointing LEFT indicates negative power flow. 4. Modifiers enhance the flexibility of some screens. See section Below is a list of available screens with some example screens: Screen Number Screen Name 1 Wh Delivered 2 Wh Received 3 +VARh 4 -VARh 5 VAh 11 Rolling W Demand Del 12 Rolling W Demand Rec 13 Block W Demand Del 14 Block W Demand Rec 15 W Demand Last Reset 16 Phase to Neutral Voltage 17 Phase Current 18 Phasors 20 VAR, PF, Frequency 21 Va, Vab Harmonics 22 Vb, Vbc Harmonics 23 Vc/Vca Harmonics 24 Ia Harmonics 25 Ib Harmonics 26 Ic Harmonics 45 Totalizer 1 46 Totalizer 2 47 Totalizer 3 eelectro Industries/GaugeTech Doc # E

44 48 Totalizer 4 49 Totalizer 1 Demand 50 Totalizer 2 Demand 51 Totalizer 3 Demand 52 Totalizer 4 Demand 53 Cumulative Demand, Del & Rec 54 Phase to Phase Voltage 55 W 56 VAR 57 PF 58 VA 59 Frequency 60 Segment Check 61 Q 63 Meter Name 64 Optical Port 65 Com Port Settings 66 Nexus Ststus 67 Firmware Versions 68 Nexus Info 69 Average PF Received (Modifier 7) 70 Average PF Delivered (Modifier 7) 71 VARh per Quadrant (Modifier 1) 72 VAh per Quadrant (Modifier 1) 73 Wh per Quadrant (Modifier 1) 74 Qh (Modifier 3) 75 Cumulative Demand (Modifier 2) 76 Rolling Window Demand (Modifier 4) 77 Block Window Demand (Modifier 4) 78 Power Factor per Phase (Modifier 6) 79 Power Factor per Quadrant 80 TOU Wh, Rec (Modifier 5) 81 TOU VAh, Q1 (Modifier 5) 82 TOU VARh, Q1 (Modifier 5) 83 TOU VAh, Q4 (Modifier 5) 84 TOU VARh, Q4 (Modifier 5) 85 TOU Wh, Del (Modifier 5) 86 TOU VAh, Q2 (Modifier 5) 87 TOU VARh, Q2 (Modifier 5) 88 TOU VAh, Q3 (Modifier 5) 89 TOU VARh, Q3 (Modifier 5) 90 TOU W Demand, Rec (Modifier 5) 91 TOU W Demand, Del (Modifier 5) 92 TOU + VAR Demand (Modifier 5) 93 TOU-VAR Demand (Modifier 5) eelectro Industries/GaugeTech Doc # E

45 Chapter 4 Testing for the Nexus 1262/1272 Meter Infrared Test Pulse Optical Port Test Button Under Cover Reset Switch Figure 4.1: The Nexus 1272 Meter WARNING! The information contained within this chapter is intended to be an aid to qualified metering personnel. It is not intended to replace the extensive training necessary to install or remove meters from service. Any work on or near energized meters, meter sockets or other metering equipment presents the danger of electrical shock, personal injury or death. All work on these products must be performed by qualified industrial electricians and metering specialists ONLY. All work must be done in accordance with local utility safety practices and the procedures outlined in the current edition of the Handbook for Electricity Metering. The handbook is available from the Edison Electric Institute, 701 Pennsylvania Avenue N.W., Washington D.C : Testing Tools The Nexus 1262 and 1272 meters are equipped with a light-emitting diode (LED) for calibration and a liquid crystal display with test screens. These two standard features provide user interface and equipment interface points for meter testing : Test Pulse LED The Test Pulse LED is located in the upper left-hand portion of the meter face as shown in Figure 4.1. The Test Pulse LED continuously emits calibration pulses (infrared light). This LED can be used for a variety of pulses including: Individual quadrants for Watthour, VAhour, VARhour and Watt Demand pulses. Each calibration pulse is equal to the value assigned to Kt (Watthours per pulse) in the meter s Device Profile. The millisecond duration of each output pulse is also programmable in the meter s Device Profile. e Electro Industries/GaugeTech Doc # E

46 To program the Test Pulse LED, from the Device Profile menu in Communicator EXT, first click on KYZ Outputs, then click on any of the Test LED pull-down menus to configure the following settings: 1. Assigned Channel - choose from settings. 2. Watthour per Pulse - enter the value in the secondary. 3. Pulse Width - can be set from 5ms to 635ms. 4. Mode - can be enabled or disabled. 5. Form - can be selected between Form A and Form C. Click OK. Then click Update Device to send the new settings to the meter. The unit for the calibration pulses is Watthours. The initial value of each pulse (Kt) is secondary Watthours per pulse : LCD Display In Test Mode, the LCD display provides user access to accumulated real, reactive and apparent energy as well as block demand for real power. There are eight screens in Test Mode: Wh - Del, Wh - Rec, VARh - Q1 & Q2, VARh - Q3 & Q4, VAh - Q1 & Q4, VAh - Q2 & Q3, Watt Demand Test Rolling and Watt Demand Test Block. See section for more detail. The LCD display also includes three phase voltage annunciators. These annunciators are labeled A, B and C to indicate the presence of voltage on the indicated phase. If voltage is not present on one phase, its indicator will not be displayed. These indicators also show whether current is flowing on the indicated phase. If no current is flowing on a phase, the annunciator will blink. When current is flowing, it will show a continuously illuminated digit. This annunciator indicates phase sequence. 4.2: Test Mode Test Mode allows the meter to be tested without disturbing billing data or setting a new maximum demand. Test Mode performs the same function as setting the pointers back on an electromechanical meter after testing. While operating in Test Mode, the meter uses the same measurement and calculation processes that are used in Normal Mode. The only difference is that the billing numbers stored in the meter are not updated with the real-time reading. This preserves the billing numbers while testing is performed : Entering Test Mode To enter Test Mode, you must pass the meter s security system. In most instances, this requires you to remove power from the meter, break the meter seal and remove the Lexan cover, and then repower the meter. e Electro Industries/GaugeTech Doc # E

47 The Test Button is one of two push buttons in the lower right hand quadrant of the meter face. Press the Test Button (on the right). The Select Transformer Loss screen appears on the display. Press the Test Button again to scroll through the following Transformer Loss screens: Transformer Loss Only Both CTPT and Transformer Loss No Compensation CTPT Only Exit - Do Not Enter Test Mode Stop on the desired screen. Then, push the Test Button for 2-3 seconds. The Test Mode screens appear, unless you selected Exit. Test will now appear in the upper right corner of the display. Upon entering Test Mode: 1. All energy, demand and TOU values are stored in the meter s nonvolatile memory. 2. Meter log recording is suspended, except for historical logging, which continues. Entries to the historical logs during testing, will reflect that Test Mode was in effect. e Electro Industries/GaugeTech Doc # E

48 4.2.2: Using Test Mode The same selected measurement profile quantities (data accumulations) that are calculated during normal operation are calculated in Test Mode. Display quantities (Watt-hour, VAR-hour, Volt- Ampere-hour and Block Demand quantities) are displayed in units rather than kilo-units; i.e. the data is displayed as Wh, VARh, VAh and Watts rather than kwh, kvarh, kvah and kw. The same demand values calculated during normal operation are also calculated in Test Mode. The display formats in Test Mode are changed to provide greater resolution during test operations. The display does not scroll while in Test Mode. Each item remains displayed until the Test Button is pressed. At that time, the next Test Mode screen is shown. The following table shows the display screens available in Test Mode, the data displayed on each screen and the pulse source for each screen: Test Mode Displayed Data and Pulse Source Test Mode Displayed Data Pulse Source Wh - Del Delivered Wh Energy kwh, Del Wh - Rec VARh - Q1 & Q2 VARh - Q3 & Q4 VAh - Q1 & Q4 VAh - Q2 & Q3 Watt Demand Rolling Watt Demand Block Received Wh Energy VARh in Quadrant 1 VARh in Quadrant 2 VARh in Quadrant 3 VARh in Quadrant 4 VAh in Quadrant 1 VAh in Quadrant 4 VAh in Quadrant 2 VAh in Quadrant 3 Watt Block Demand Delivered Watt Block Demand Delivered kwh - Rec kvarhr, Del kvarhr, Rec kvahr, Q1 kvahr, Q3 kwh, Del kwh, Del Adjacent to the Test Button (T) is the Reset Button (R). A Test Reset is initiated by pressing and releasing the Reset Button while in Test Mode. A Test Mode Reset causes all test quantities to be reset to zero and a new block interval to be started. The item displayed when the reset occured remains in the display but the value will be initialized. e Electro Industries/GaugeTech Doc # E

49 While in Test Mode, the Test Pulse LED will pulse at the rate programmed for the meter. The value of the pulse is set in the meter s Device Profile>Internal KYZ Outputs (see Chapter 4 of the Communicator EXT User Manual for instructions). The meter quantity assigned to the Test Pulse LED changes as the user moves from one test screen to another. The assigned values are defined in the Pulse Source column of the table on the previous page. Individual quadrant tests for VAR-hours can be completed by proper test design. To test strictly VAR-hours, limit the test parameters to one quadrant during testing. In the event of a power outage, data for Test Mode Energy, Demand and Power Factor are not saved. Upon power up, the meter returns to Normal Mode. The test data is lost and all registers are restored to their pretest values. While in Test Mode, the IR Port and Communications Port 1 are available for communication with the meter. In Test Mode, you can preset the values of the energy readings that will be restored to the meter when Test Mode is exited,using Communicator EXT (see following section or Chapter 4 of the Communicator EXT User Manual for instructions) : Test Mode Preset Accumulators There are two reasons to use the Preset Accumulators screens: 1. A monitor in Test Mode is out of service and is therefore not monitoring accumulations. The New Value field can be used to adjust for the values not monitored while in Test Mode. 2. When replacing an old meter that has accumulations with a new meter that has no accumulations, the New Value field can be set to the value of the existing accumulations. Setting Test Mode Preset Accumulators From Communicator EXT s Main screen, select Tools>Test Mode>Preset Accumulators. You will see the screen shown on the right. Click Tabs at the top of the screens to access the individual screens. Each screen has a Current Value, New Value and Preset Box for each accumulator. A new meter has zeros for Current Values. e Electro Industries/GaugeTech Doc # E

50 Settings can be preset for the following sets of values: Primary Energy, Secondary Energy, Primary Energy (Quadrants), Secondary Energy (Quadrants), Internal Input Accumulators, KYZ Output Accumulators, Q Hours, I & V Squared T Accumulators, Cumulative Demand (Secondary) and Uncompensated Energy. Examples of some of the screens are shown here. 1. Click the Preset Boxes for the values you want to set. 2. Click Set to save your entries or Cancel to exit the screen without saving any changes : Exiting Test Mode Exit Test Mode in one of the following three ways: 1. Pressing and holding the Test Button for more than 3 seconds. 2. By the Test Mode Time-Out Timer, if no load is present. 3. By the Extended Test Mode Time-Out Timer, if load is present. These options are explained further in the following sections. Pressing the Test Mode Button for more than three seconds ends Test Mode and returns the meter to Normal Mode. The Test Mode Time-Out Timer has two modes of operation, depending on whether the meter sees measurable load. If the meter does not recognize measureable load: The meter watches for user interaction by monitoring activity on the Test Button and the Reset Button. If neither button is pushed within the programmed Exit Delay time, the meter e Electro Industries/GaugeTech Doc # E

51 exits Test Mode and returns to Normal Mode. Each time the Test or Reset Button is pressed, the meter starts the Exit Delay Timer again. The Exit Delay time is programmed in the meter s Device Profile. If the Meter recognizes measurable load: The meter watches the Test and Reset Buttons for activity, using an extended time limit consisting of the Exit Delay time plus the programmed Block Interval Time. This insures that the meter can complete a full block demand test without interruption. All Test Mode data is lost when Test Mode is exited. Upon exiting Test Mode, a new (possibly partial) demand interval and subinterval are started. The past subinterval as well as the current subinterval are zeroed. Upon returning to Normal operating mode, a TOU meter or demand meter with load profiling will complete the time remaining in the current partial subinterval so that subsequent subintervals will be synchronized with the hourly boundary. Maximum demand values for each demand integration type are not modified while in Test Mode. The previously recorded maximums are restored when Test Mode is exited. If you choose to reset demand data during testing operations, this action can be completed after Test Mode is exited by pressing the Reset Button after the meter has returned to Normal Mode. NOTE: Normal billing and historical log data accumulation is suspended during Test Mode operation. Upon exiting Test Mode, accumulation of billing and historical log quantities: 1. Resume from the values in place when Test Mode was entered, or 2. Continue from the Test Mode Preset values (see Section 4.2.4). e Electro Industries/GaugeTech Doc # E

52 e Electro Industries/GaugeTech Doc # E

53 Chapter 5 Serial Communication Wiring 5.1: Communication Overview RS232 communication is used to connect a single Nexus 1262/1272 meter with another device, such as a computer, RTU or PLC. The link is viable for up to 50 feet (15.2 m) and is available only through the meter s Optical Port with a communication interface (Optical Port to RS232 Converter) (Figures 5.2 and 5.3). RS485 communication allows multiple meters to communicate with another device at a local or remote site. The Output modules and external displays use RS485 to communicate with the meter. All RS485 links are viable for up to 4000 feet (1220 m). The Nexus Socket Meter s Ports 1 and 4 are two-wire, RS485 connections (up to 115,200 baud). Optional Communication Connections for INP2 (Internal Modem with Dial In/Dial Out), INP200 (10/100BaseT connection) or INP202 (Combination Modem and Ethernet) are cables with appropriate connectors (Fig. 6.2). Meter Optical Port Optical Port to RS232 Communication Interface (A7Z) RS Feet Meter RS485 RS485/232 RS Feet Converter (Unicom 2500) 50 Feet Meter RS Feet RS485/232 Converter (Modem Manager) RS Feet MODEM Telephone Line, Fiber Optic Link or Radio Link Figure 5.1: Communication Overview e Electro Industries/GaugeTech Doc # E

54 Optical Port Figure 5.2: Nexus 1272 Meter Optical Port 5.2: Communicating to the Meter through the ANSI Type II Optical Port Use the ANSI Type II Optical Port on the face of the Nexus 1262/1272 Socket Meter for RS232 communication. The Optical Port is compatible with the A7Z Communication Interface and similar ANSI Type II Magnetic Communication Interfaces. See Figure 5.3. One end of the magnetic interface simply snaps onto the optical port; the magnet keeps it in place. The other end is an RS232 connection. Insert that end into a 9-pin serial port on a computer or other device. The A7Z requires no power supply. All power is received from the host computer serial port using transmitteer and receiver circuits within the probe. The RS232 standard limits the cable length to 50 feet (15.2m). e Electro Industries/Gauge Tech Doc # E

55 Magnetic Coupler RS232 Connection Figure 5.3: A7Z Communiation Interface 5.3: RS485 Serial Communication 5.3.1: RS485 Wiring Fundamentals - (Port 1 and Port 4) S A(+)/B(-) Shield: It is not an earth-ground connection. You must also connect the shield to earthground at one point. Do not connect the shield to ground at multiple points; it will interfere with communication. Two-wire, RS485 communication terminals: Connect the A(+) terminal of the Meter Port to the (+) terminal of the device. Connect the B(-) terminal of the Meter Port to the (-) terminal of the device. e Electro Industries/Gauge Tech Doc # E

56 RS485 communication allows multiple devices to communicate on a bus. The Meter s Port 1 and Port 4 are RS485 terminals, viable for a distance of up to 4000 feet (1219 m). Below is a detail of a 2-wire RS485 port. Meter 2-wire RS485 Port Figure 5.4: 1262/ Wire RS485 Port Detail For All RS485 Connections: Use a shielded twisted pair cable 22 AWG (0.33 mm 2 ) or larger, grounding the shield at one end only. Establish point-to-point configurations for each device on a RS485 bus: Connect (+) terminals to (+) terminals; connect (-) terminals to (-) terminals. Protect cables from sources of electrical noise. Avoid both star and tee connections (see Figure 5.6). No more than two cables should be connected at any one point on an RS485 network, whether the connections are for devices, converters or terminal strips. Include all segments when calculating the total cable length of a network. If you are not using an RS485 repeater, the maximum length for cable connecting all devices is 4000 feet (1219 meters). For an RS485 Daisy Chain connection, in which you link multiple devices in a series, connect shield to RS485 Master and individual devices as shown in Figure 5.5. You may also connect the shield to earth-ground at one point. e Electro Industries/Gauge Tech Doc # E

57 The Nexus 1262/1272 meter may be shipped with connectors on the ends of cables or they may be shipped as pigtails (no connectors). In this case, a generic terminal block will be shipped with the meter. The terminal block has up to 12 connectors and can be cut into smaller sections with a utility knife. Please refer to the Cable Color Key on page 6-4, if you are using pigtails or if you have any question about which connector is which. NOTE: R T EXPLANATION Termination Resistors (R T ) are generally used on both ends of longer length transmission lines. The value of the Termination Resistors is determined by the electrical parameters of the cable. Termination Resistors are only needed with runs typically more than 500 feet, as the meter has some level of termination internally and usually resistors are not needed. Figure 5.5 shows a representation of an RS485 Daisy Chain connection. RS485 Master Last Slave Up to 31 Slaves Figure 5.5: RS485 Daisy Chain Connection e Electro Industries/Gauge Tech Doc # E

58 Incorrect Connection: T Tee Connection Incorrect! The three wires connected in a T shape on both the (+) and (-) terminals will cause interference problems. RS485 Port Incorrect Connection: Star Star Connection Incorrect! The three wires connected in a Star shape on both the (+) and (-) terminals will cause interference problems. RS485 Ports Figure 5.6: Incorrect T and Star Topologies e Electro Industries/Gauge Tech Doc # E

59 5.3.2: Using the Unicom 2500 The Unicom 2500 provides RS485/RS232 conversion. In doing so it allows the Nexus meter to communicate with a PC or other device. See the Unicom 2500 Installation and Operation Manual for additional information. Figure 5.7 illustrates the Unicom 2500 connections for RS485. Figure 5.7: Unicom 2500 with Connections Figure 5.8:Detail of Jumpers The Unicom 2500 can be configured for either 4-wire or 2-wire RS485 connections. Since the Nexus meter uses a 2-wire connection, you need to add jumper wires to convert the Unicom 2500 to the 2-wire configuration. As shown in Figure 5.8, you connect the "RX-" and "TX-" terminals with a jumper wire to make the "-" terminal, and connect the "RX+" and "TX+" terminals with a jumper wire to make the "+" terminal e Electro Industries/GaugeTech Doc #: E

60 5.3.3: RS485 Connection Meter to a Computer or PLC Use Port 1 or Port 4. For information on connecting the Meter to a modem, see Section of this manual. The link using RS485 is viable for up to 4000 feet (1219 meters). You may need to use an RS485 to RS232 converter : RJ-11 (Telephone Line) Connection Meter with INP2 (Internal Modem with Dial In/Dial Out Option) to a PC Use RJ-11 Standard Telephone Line to connect with the Meter. The RJ-11 line is connected to Cable 5 from the back of the Meter with Internal Modem Option. The RJ-11 connector is supplied. The length of the connection using RJ-11 into the Meter is virtually unlimited. To connect with other meters in either local or remote locations, you MUST use Cable 5. For more information on the meter with the INP2 Option, see Section : RJ-45 Connection Meter with INP200 (10/100BaseT) Option The INP200 Option conforms to the IEEE 802.3, 10/100BaseT specification using unshielded twisted pair (UTP) wiring. This allows the use of inexpensive RJ-45 connectors and CAT 3 or better cabling. The RJ-45 connector is supplied with the meter (Cable 6). Using this LAN connection allows multiple PC s to access the meter concurrently. The RJ-45 line is inserted into the RJ-45 connector on Cable 6 coming from the back of the meter with the Ethernet Option. The connection using RJ-45 into the meter connects the meter to a network using Modbus/TCP protocol over Ethernet. For more information on a meter with the INP200 Onboard Ethernet (10/100BaseT), see Section : Modem/Ethernet Connection Meter with INP202 (Combo Card) Option The INP202 is an extension of INP200. It has all the features of INP200 plus a built-in Modem. Modem and Ethernet capabilities can be used simultaneously. The communication protocol supported by the modem is Modbus ASCII. The Communication protocol supported by the Ethernet/Modem is Modbus RTU. INP102 converts all incoming modem Modbus ASCII requests to Modbus RTU for internal and gateway communication. It then converts all response Modbus RTU messages into Modbus ASCII protocol before it sends the responses to the modem. Some of the fixed parameters for the Ethernet/Modem are: 8 Data Bits, Even Parity, 1 Stop Bit. The Ethernet/Modem s Gateway s Baud Rate and Delay Time are configurable. For more information on a meter with the INP202 Modem/Ethernet Combo Card, see Section 5.6. e Electro Industries/Gauge Tech Doc # E

61 5.3.7: RS485 Connection Meter to the P40N, P41N or P43N LED Display Connect the communication wires of the supplied RS485 cable to the Port 1 or Port 4 connection of the meter. Set the port s Baud Rate to 9600, Address to 1, Protocol to Modbus RTU and Mode to Slave using the communication software. Insert the other end of the communication wires into the back of the first LED Display. The Nexus 1262/1272 meter s Power Supply DOES NOT SUPPLY POWER TO EXTERNAL DISPLAYS. You must use a power source, such as the EIG PB1 (12VO). See Figure 5.7 for wiring details. RS485 communication is viable for up to 4000 feet (1219 meters). Be sure to do the following: Connect the shield to the shield (S) terminal on the Display port. The (S) terminal on the meter is used to reference the meter s port to the same potential as the source. It is not an earth-ground connection. You may also connect the shield to earth-ground at one point. Provide termination resistors at each end for longer runs (typically 500 or more), connected to the A(+) and B(-) lines. RT is approximately 120 Ohms. LED Display Port P40N, P41N or P43N LED Display, Back View R T* Top V+ V- S B(-) A(+) R T* Bottom * See R T Note on page /1272 Port 4 * * **Please refer to Cable Color Key, page 6-4, and second bullet, page 5-5. Figure 5.9: Meter Connected to P40N, P41N or P43N LED External Display e Electro Industries/Gauge Tech Doc # E

62 5.3.8: RS485 Connection Meter to P60N Touch Screen External Display To connect the Touch Screen External Display, follow the wiring directions for the P40N in section and follow the wiring diagram in Figure 5.7. The only difference between the two displays is that the port on the P60N is in the lower right hand corner of the back of the display (not in the center of the back) as shown below. P60N Touch Screen Display, Back View (Detail) Top Factory Test Connector Touch Screen Display Port Bottom P60N Touch Screen Connection Key LCD 5 DCIN (12-30V dc ) 4 (GND) Meter V+ V- 3 (485+) A(+) 2 (485-) B(-) 1 (GND) S Figure 5.10: P60N Touch Screen Display Port e Electro Industries/Gauge Tech Doc # E

63 5.3.9: Communication Ports on the Output Modules Female RS485 Side Port: use to connect to another module s male RS485 side port. Male RS485 Side Port: use to connect to the meter s Port 4 (see section 5.3.6) or to connect to another module s female RS485 side port. Output Port: use for functions specific to the type of module; size and pin configuration varies depending on type of module. For more detail, refer below to Section and to Chapter 10 of this manual. Mounting Brackets Female RS485 Side Port LEDs Output Port (Size and pin configuration vary) Male RS485 Side Port Figure 5.11: Communication Ports on the Output Modules e Electro Industries/Gauge Tech Doc # E

64 5.3.10: RS485 Connection Meter to Output Modules An RS485 cable harness is supplied with the purchase of MBIO (mounting brackets). Wire one end of the cable into Port 4 of the meter. Insert the other end of the cable into the communication pins of the Output module s male RS485 side port (see Figure 5.9). See Section 10.3 for details on using multiple Output modules. The Nexus 1262/1272 meter s Power Supply WILL NOT SUPPLY POWER TO THE OUTPUT MODULES. You must use a power source, such as the EIG PSIO or PB1 (12V). RS485 communication is viable for up to 4000 feet (1219 meters). (See Section for PSIO details.) Follow the wiring diagram below and be sure to: Connect the A(+) and B(-) terminals on the meter to the A(+) and B(-) terminals of the female RS485 port. Connect the shield to the shield (S) terminal. The (S) terminal on the meter is used to reference the meter s port to the same potential as the source. It is not an earth-ground connection. You may also connect the shield to earth-ground at one point. Provide termination resistors at each end for longer runs (typically more than 500 ), connected to the A(+) and B(-) lines. RT is approximately 120 Ohms. NOTE: The meter has some level of termination internally and usually resistors are not needed. Male Side Port on Output Module R T* R T* *See R T Note on page /1272 Port 4 * * **Please refer to Cable Color Key, page 6-4, and second bullet, page 5-5. Figure 5.12: Meter Connected to Output Module e Electro Industries/Gauge Tech Doc # E

65 5.3.11: Steps to Determine Power Needed The Nexus 1262/1272 meter s Power Supply DOES NOT SUPPLY POWER to the Output Modules. Refer to the table in the next section (Section ) to determine the VA Ratings for Output modules and displays. Add together the VA Ratings for Output modules and displays in use to determine power needed. Connect one or more PSIO units. (PSIO is designed for use with the Output modules.) Each PSIO will supply 12 12V dc. For details on PSIO, see Section NOTE: For 24 or 48 V dc applications, EIG recommends the PB1 (or PSIO) power supply. Order example number: PB1-D2-12VO (or PSIO-D2). See Figure 5.11 for wiring : Output Modules Factory Settings and VA Ratings All Output modules are shipped pre-programmed with a baud rate of and individual addresses. The table below details the factory-set address for each module and the VA Ratings for Output modules and displays. Refer to the previous section (Section ) for the steps to determine the power required. For programming details, refer to the accompanying Communicator EXT User Manual. OUTPUT MODULES FACTORY SETTINGS AND VA RATINGS MODEL NUMBER MODULE ADDRESS VA RATING 1mAON4 1mAON8 20mAON4 20mAON8 0-1mA, 4 Analog Outputs 0-1mA, 8 Analog Outputs 4-20mA, 4 Analog Outputs 4-20mA, 8 Analog Outputs VA VA VA VA 4RO1 4PO1 4 Latching Relay Outputs 4 KYZ Pulse Outputs VA VA P40N, P41N, P43N P60N DISPLAYS VA RATINGS LED Display Touch Screen Display 3.0 VA (typical)* 5.0 VA (typical) * 3.0 VA is the typical VA Rating for P40N 2005 or later. e Electro Industries/Gauge Tech Doc # E

66 5.3.13: Remote Communication Over Telephone Lines Using the RS485 Port Use modems (dedicated or dial-up) when devices are at great distances. We recommend using RS485 wiring with a Modem Manager. Remote Connection RS485 PC at office Originate Modem Telephone Line Remote Modem Nexus 1262/1272 Meter RS- NULL Modem Adapter (Not required if Modem Manager is used) RS232 to RS485 Converter (Modem Manager Recommended) Figure 5.13: Remote Connections RS485 e Electro Industries/Gauge Tech Doc # E

67 Use Port 1 or Port 4 for RS-485 communication. The link using RS485 is viable for up to 4000 feet (1219 meters). Use Communicator EXT software to set the port s baud rate to the appropriate speed for your hardware and/or network and enable Modbus ASCII protocol. See the Communicator EXT User Manual for instructions. You must use an RS485 to RS232 converter and a Null Modem. EIG recommends using its Modem Manager. This converter has a built-in null modem and also provides line data buffering, making the telephone line communication reliable; most commercial modems do not. For this reason, EIG recommends the Modem Manager to alleviate any communication line errors that might occur. Using the Modem Manager also eliminates the need to program default settings into the modem. This makes installation simpler. e Electro Industries/Gauge Tech Doc # E

68 5.3.14: Programming Modems for Remote Communication When a modem speaks to most RS485 or RS232-based devices, it must be programmed to certain settings for the communication to work. This task is often quite complicated. Modem Manager was designed to eliminate this step. If you are not using a Modem Manager device, you must follow the steps below to communicate with the remote meter(s). Consult your modem s manual for the proper string settings or see Section for a list of selected modem strings. Modem Connected to a Computer (the Originate Modem): Restore modem to factory settings. This erases all previously programmed settings. Set modem to display Result Codes. The computer will use the result codes. Set modem to Verbal Result Codes. The computer will use the verbal result codes. Set modem to use DTR Signal. This is necessary for the computer to ensure connection with the originate modem. Set modem to enable Flow Control. This is necessary to communicate with remote modem connected to the Meter. Tell modem to write the new settings to activate profile. This places these settings into nonvolatile memory; the setting will take effect after the modem powers up. Modem Connected to the meter (the Remote Modem): Restore modem to factory settings. This erases all previously programmed settings. Set modem to auto answer on n rings. This sets the remote modem to answer the call after n rings. Set modem to ignore DTR Signal. This is necessary for the Meter to ensure connection with originate modem. Set modem to disable Flow Control. RS232 communication does not support this feature. Tell modem to write the new settings to activate profile. This places these settings into nonvolatile memory; the setting will take effect after the modem powers up. When programming the remote modem with a terminal program, make sure the baud rate of the terminal program matches the meter s baud rate. e Electro Industries/Gauge Tech Doc # E

69 5.3.15: Selected Modem Strings Modem Cardinal modem: Zoom/Faxmodem VFX V.32BIS(14.4K): Zoom/Faxmodem 56Kx Dual Mode: USRobotics Sportster 33.6 Faxmodem: DIP switch setting: USRobotics Sportster 56K Faxmodem: DIP switch setting: String/Setting AT&FE0F8&K0N0S37=9 AT&F0&K0S0=1&W0&Y0 AT&F0&K0&C0S0=1&W0&Y0 AT&F0&N6&W0Y0 (for 9600 baud) Up Up Down Down Up Up Up Down AT&F0&W0Y0 Up Up Down Down Up Up Up Down : High Speed Inputs Connection The High Speed Inputs can be used in multiple ways: 1. Attach the KYZ pulse outputs from other meters for pulse counting and totalizing. 2. Attach status contacts from relays, breakers or other devices for status or waveform initiation. Refer to the Communicator EXT User Manual for information on programming the High Speed Inputs. Figure 5.14: High Speed Inputs Connection e Electro Industries/Gauge Tech Doc # E

70 5.3.17: IRIG-B Connections IRIG-B is a standard time code format that synchronizes event timestamping to within 1 millisecond. An IRIG-B signal-generating device connected to the GPS satellite system will synchronize Nexus meters located at different geographic locations. The Nexus meter utilizes an unmodulated signal from a satellite-controlled clock (such as the Arbiter 1093B). For details on installation, refer to the User s Manual for the satellite-controlled clock in use. Below are installation steps and tips that will help you. GPS Satellite Connection IRIG-B Port IRIG-B Time Signal Generating Device Figure 5.15: IRIG-B Connection Installation: 1. Set Time Settings for the meter being installed. From Communicator EXT, Device Profile, Click Time Settings. Set the Time Zone and Daylight Savings Time. Click Update Device Profile to save the new settings. (See Communicator EXT User s Manual.) 2. Before connection, make sure that the meter is set to the right year (IRIG-B does not supply the year). 3. Connect the (+) terminal of the meter to the (+) terminal of the signal generating device; connect the (-) terminal of the meter to the (-) terminal of the signal generating device. Troubleshooting Tip: The most common source of problems is a reversal of the two wires. Try reversing the wires. e Electro Industries/GaugeTech Doc #: E

71 5.3.18: Time Synchronization Alternatives (See Communicator EXT User s Manual for details.) IRIG-B: All Nexus 1262/1272 meters are equipped to use IRIG-B for Time Sychronization. If IRIG-B is connected, this form of Time Synchronization takes precedence over the Internal Clock. If the GPS Signal is lost, the Internal Clock takes over time keeping at the precise moment the signal is lost. Line Synchronization: All Nexus meters are equipped with Line Synchronization, which may be Enabled or Disabled for use instead of IRIG-B. If Line Synchronization is Enabled and power is lost, the Internal Clock takes over at the precise moment power is lost. Internal Clock: All Nexus meters are equipped with Internal Clocks, which can be used if IRIG-B is not connected and/or Line Sync is not Enabled. If either of the above Time Sync Tools fails, the Internal Clock will take over at the precise moment the synchronization tool in use fails. Time Setting Tools: 1. Tools, Set Device Time: For manual or PC Time Setting. 2. Script & Scheduler: Time Stamps Retrieved Logs and Data. 3. MV90: Can synchronize time on retrievals in the form of a Time Stamp. Refer to the Communicator EXT User Manual (HHF Converter) for more MV-90 details. e Electro Industries/GaugeTech Doc # E

72 5.4: INP2 Internal Modem with Dial-In In/Dial-Out Option 5.4.1: Hardware Overview The INP2 Option for the Nexus 1262/1272 meter provides a direct connection to a standard telephone line. No additional hardware is required to establish a communication connection between the meter and a remote computer. The modem operates at up to 56k baud. The internal connection between the modem and the meter includes a memory buffer. This enables the modem to connect to the phone line at any speed and to change speed during the communication connection to the remote PC. The buffer between the meter and the modem allows the meter to communicate into the modem at a constant speed while the modem telephone line speed can vary. This eliminates the synchronizing problems that are common with other devices. It also increases the effective throughput of the communication channel. This, in turn, decreases connection time and connection costs. The modem supports both incoming calls (from a remote computer) and automatic dial-out calls when a defined event must be automatically reported : Hardware Connection When the INP2 Option is ordered, there are two RJ-11 jacks that pigtail from the back of the meter (1. Line connection for the outside line 2. Phone connection for your phone). A standard telephone RJ-11 plug can connect the meter to a standard PSTN (Public Switched Telephone Network). The phone jack is the override of the modem function when the phone is in use. With the device configured with the INP2 Option, the meter has dial-in capability and provides remote access to other Modbus-based serial devices via the meter s RS485 Gateway over your phone line. The meter will recognize and respond to a Modbus Address of 1. With any other address, the command will pass through the gateway and become a virtual connection between the Remote Modbus Master and any Modbus Slave connected to the RS485 Gateway : Dial-In Function The modem continuously monitors the telephone line to detect an incoming call. When an incoming call is detected, the modem will wait a user-set number of rings and answer the call. The modem can be programmed to check for a password on an incoming call. If the correct password is not provided the modem will hang up on the incoming call. If several unsuccessful incoming call attempts are received in a set time period, the modem will lock out future incoming calls for a user-set number of hours. When an incoming call is successfully connected, the control of communications is passed to the calling software program. The modem will respond to computer commands to download data or other actions authorized by the meter passwords. Refer to the Communicator EXT User Manual for instructions on programming the modem. e Electro Industries/GaugeTech Doc # E

73 5.4.4: Dial-Out Function The Dial-Out Function (INP2) is intended to allow the meter to automatically report certain conditions without user intervention. The modem is normally polling the meter to determine if any abnormal or reportable conditions exist. The modem checks the following meter conditions and programmed events (set in Communicator EXT) to determine if a call should be placed. Are any meter set-point limits exceeded? Has status of high-speed inputs changed? Has waveform been recorded? Has power quality event been recorded? Has a control output changed? Has meter experienced a loss of control power? Is either history log approaching a full condition? Is the event log approaching a full condition? Is any other log approaching a full condition? Has the modem password failed? Has communication with the meter failed? If any of the monitored events exist, the modem will automatically initiate a call to a specified location to make a report or perform some other function. For log full conditions, the meter will automatically download the log(s) that are nearing the full state. The modem can be programmed to call two different numbers to make the required reports, Primary and Backup. The modem can be programmed with an ASCII string for identification purposes. If this string in present the modem will play the string to the host computer upon connection to identify the meter to the host software. Refer to the Communicator EXT User Manual for programming details. The modem includes a connection for an external 3V Lithium Battery (with custom leads and velcro mounting) to power the modem if the meter loses control power. Using the battery, the modem will be able to complete a reporting call even if power to the meter has been disconnected. This feature allows the meter to report power outage conditions. Under normal conditions, the battery should provide in excess of 10 years of service during storage conditions (disconnected from terminals) or when properly installed in an energized meter. The battery should provide more than one year of service during outage conditions (on battery backup). A LOW BATTERY indicator will appear on the display screen (ONLY when there is a low battery). Call the factory for a replacement battery. Replacement of the battery is simple. The battery is attached to a cable (if ordered) which pigtails from the back of the meter with a connector (see NOTE below and Fig. 6.2 and Table 6.1). Installation steps: 1. Remove the old battery by disconnecting it at the connector. 2. Install the new battery by snapping it into the connector. 3. Peel and stick the velcro adhesive somewhere outside the meter (or use the old adhesive to fasten the battery in place). NOTE: Custom leads and Velcro mounting are not included in some earlier versions of the Switchboard Meter. Call the factory for installation/replacement part BATT4384. e Electro Industries/GaugeTech Doc # E

74 5.5: INP200 Onboard Ethernet Using Electro Industries Rapid Response TM technology, the INP200 Ethernet card offers 100BaseT design optimized for downloads and data collection. The unit equips a Nexus meter with Modbus TCP and DNP over Ethernet communication. The module opeates at speeds up to 100BaseT : Hardware Overview A Nexus 1262/1272 meter with the 10/100BaseT Ethernet Option (INP200) has all the components of the standard Nexus meter PLUS the capability of connection to a network through an Ethernet LAN. The Internal Network Option of the Nexus meter is an extremely versatile communication tool. It: Adheres to IEEE Ethernet standard using TCP/IP. Utilizes simple and inexpensive 100BaseT wiring and connections. Plugs right into your network using the built-in RJ-45 jack. Communicates using the industry standard Modbus/TCP protocol : Hardware Connection Use Standard RJ-45 10/100BaseT cable to connect with the Nexus meter. The RJ-45 line is inserted into the RJ-45 Port coming from the back of the meter with the INP200 Ethernet Option. To configure the Network settings, use the following steps. 1. Using Port 1, Port 4 (RS485 connection), or the optical port connect a PC to the meter. An RS232/RS485 Converter may be required (Example: Electro Industries Unicom 2500). 2. Double click on Communicator EXT Software to open it. 3. Click the Quick Connect or the Connection Manager icon in the icon tool bar. Click the Serial Port button. Make sure data matches the meter, then click Connect. Set the Network using the following steps: (Refer to Section of the Communicator EXT User Manual for more details). 1. From the Device Profile menu, click General Settings>Communications>one of the ports. You will see the Device Profile Communications Settings screen. 2. In the Network Settings section, enter data provided by your systems manager: IP Address: (Example) Subnet Mask: (Example) Default Gateway: (Example) Computer Name: NETWORK (Example) e Electro Industries/GaugeTech Doc # E

75 After the Network parameters are set, Communicator EXT will connect to the meter via the Network using a Device Address of 1 and the assigned IP Address. Follow these steps: 1. Double click on the Communicator EXT icon to open the software. 2. Click the Connect icon in the icon tool bar. You will see the Connect screen. 3. Click the Network button at the top of the screen. The screen will change to one requesting the following information: Device Address: 1 Host: Network Port: 502 Protocol: Modbus TCP IP Address (per your network administrator). Example: Click the Connect button at the bottom of the screen. Communicator EXT connects to the meter via the Network. NOTE: Communicator EXT always communicates Modbus TCP which is the default protocol for Nexus meters. NOTE: Nexus meters do not support web pages, , FTP, or DHCP communication. 5.6: INP202 Ethernet/Modem Combination The INP202 Option is an extension of INP200. It has all the features of INP200 plus a built-in modem. The communication protocol supported by the modem is Modbus ASCII. The communication protocol supported by the RS485 Ethernet/Modem Gateway is Modbus RTU. INP202 converts all incoming Modem Modbus ASCII requests to Modbus RTU for internal and gateway communication. It then converts all response Modbus RTU messages into Modbus ASCII and sends the responses to the modem : Hardware Overview The Nexus 1262/1272 meter with the INP202 Option has all the components of an INP200 Nexus meter plus a built-in modem. It has the capability of connecting to a network through an Ethernet LAN and with other devices via modem. e Electro Industries/GaugeTech Doc # E

76 5.6.2: Hardware Connection There are three cables to connect for the INP202 Option. An RS485 Gateway cable, an RJ-45 Ethernet cable and an RJ-11 Modem cable are inserted into the cables coming from the back of the Nexus meter with the INP202 Ethernet/Modem Option. Refer to Figure 6.2 for details on cables. To make the software connection, use the following steps. 1. Using Port 1 or Port 4 (RS485 connection), connect a PC to the meter. An RS232/RS485 Converter may be required (Example: Electro Industries Unicom 2500). 2. Double click on Communicator EXT Software to open it. 3. Click the Quick Connect or the Connection Manager icon in the icon tool bar. Click the Serial Port button. Make sure data matches the meter, then click Connect. Set the Network Settings using the following steps: (Refer to Section of the Communicator EXT User Manual for more details). 1. From the Device Profile menu, click General Settings>Communications>one of the ports. You will see the Device Profile Communications Settings screen. 2. In the Network Settings section, enter data provided by your systems manager: IP Address: (Example) Subnet Mask: (Example) Default Gateway: (Example) Computer Name: NETWORK (Example) After the Network parameters are set, Communicator EXT will connect to the meter via the Network using a Device Address of 1 and the assigned IP Address. Follow these steps: 1. Double click on the Communicator EXT icon to open the software. 2. Click the Connect icon in the icon tool bar. You will see the Connect screen. 3. Click the Network button at the top of the screen. The screen will change to one requesting the following information: Device Address: 1 Host: Network Port: 502 Protocol: Modbus TCP IP Address (per your network administrator). Example: Click the Connect button at the bottom of the screen. Communicator EXT connects to the meter via the Network. 3. For the Modem connection, follow the instructions in Section 5.4. NOTE: Nexus meters do not support web pages, , FTP, or DHCP communication. e Electro Industries/GaugeTech Doc # E

77 Chapter 6 Hardware Installation 6.1: Mounting the Nexus Socket Meter The Nexus 1262/1272 Socket meter is designed to mount into a standard meter socket. Follow the Installation Summary below or follow the installation instructions on the meter socket to ensure that the unit is installed securely. The Nexus Socket meter can be mounted outside or in an enclosed and protected environment, such as in a switchgear cabinet. You may install a switch or circuit breaker nearby and label it clearly as the monitor s disconnecting mechanism. Front View Side View Output Modules Figure 6.1: Nexus 1262/1272 Mounting Dimensions Installation Summary Examine the labels to verify that the meter you are installing is, in fact, the correct form factor and service type. Make sure that the socket and meter current class ratings are compatible. Make sure that all communication and auxiliary power wiring is accessible in case disconnection is required for any reason. Before applying power to the meter, install batteries if not installed at the factory and check the connections if they are installed. POWER MUST BE OFF TO INSTALL THE INTERNAL BATTERY! To install the Internal Battery, remove the Internal Shroud and place the battery into the battery compartment with the + facing UP. Replace the Internal Shroud. To install the Modem Battery, with the Outer Shroud on the meter, locate the battery cable at the back of the meter and insert the cable connector into the cable. Use the velcro (peel and stick) to attach the battery somewhere outside of the meter. See Figure 6.6. e Electro Industries/GaugeTech Doc # E

78 Measure the enclosure to make sure it accomodates the meter. (If it is standard size, that won t be necessary.) Make sure that any communications wiring from the back of the meter is fed through the appropriate openings in your socket to allow for clean connections with external devices. Insert the meter into the socket, making sure that the unit blades are firmly within the jaws of the socket. Connect external devices to the appropriate communications wiring. See Figure 6.2 and Table 6.1, Cable Color Key, below for communications wiring details. RJ-11 and RJ-45 connectors will be supplied. All Nexus Socket meters are wired like the meter pictured below. Make sure the meter is functioning properly by running it through a test circuit. The Nexus Socket meter has its own display built into the face of the meter. However, you may want to install additional displays in remote locations. Following are installation procedures for the Nexus P40N, P41N, P43N and P60N displays. Installation Procedures for Nexus Output Modules are also provided in this chapter. Cable 8 Optional Aux Power Cable Cable 1 Port 1 Port 4 IRIG-B Cable 3 Optional KYZ Cable Cable 2 Cable to High- Speed Inputs OPTIONAL COMMUNICATION Combo Modem/Ethernet Cable 4 RS485 Cable 5 RJ-11 Modem Cable 6 RJ-45 Ethernet Modem Cable 4 RS485 Cable 5 RJ-11 Modem Cable 7 Battery Ethernet Cable 6 RJ-45 Ethernet Figure 6.2: Nexus 1272 Rear View Diagram e Electro Industries/GaugeTech Doc # E

79 0.87 (22.1 mm) 10.4 (264.2mm) 6.84 (173.7mm) Figure 6.3: Nexus 1262/1272 Meter Mounted in A-Base Bottom mm) 6.60 (167.6mm) 2.02 (51.3mm) Figure 6.4: Nexus 1262/1272 Meter A Base Side View e Electro Industries/GaugeTech Doc # E

80 6.1.1: Cable Color Key CABLE SIGNAL NAME COLOR CABLE SIGNAL COLOR PORT 1 Wiring (RS485) RS485 SHIELD Black SHIELD Blue Tx/Rx + Tx/Rx - Brown Red Cable 4 Tx/Rx+ Tx/Rx- Green Red PORT 4 Wiring (RS485) Cable 1 SHIELD Orange Tx/Rx + Yellow RJ-11 Modem Tx/Rx - Green Cable 5 Label attached Blue IRIG-B + - Blue Purple RJ-45 Ethernet Cable 6 Label attached Blue HIGH SPEED INPUTS INPUT 8 Black INPUT 7 Brown Battery INPUT 6 Red Cable 7 Label attached Black Cable 2 INPUT 5 INPUT 4 Orange Yellow INPUT 3 Green Aux Power INPUT 2 Blue Cable 8 Positive Brown INPUT 1 Gray Neutral/Negative Blue COMMON Purple Optional KYZ Output NORMALLY CLOSED 1 Black COMMON Brown NORMALLY OPEN 1 Red NORMALLY CLOSED 2 Orange COMMON Yellow Cable 3 NORMALLY OPEN 2 Green NORMALLY CLOSED 3 Blue COMMON Purple NORMALLY OPEN 3 Gray NORMALLY CLOSED 4 Light Green COMMON Pink NORMALLY OPEN 4 White IMPORTANT NOTE: Cable colors are subject to change without notice in this manual. Refer to CABLE LABELS for color code verification. Table 6.1: Nexus 1262/1272 Meter Cable Color Key e Electro Industries/GaugeTech Doc # E

81 6.2: Internal Battery Installation and Maintenance + Internal Battery Fig. 6.5: Nexus 1272 Meter without Internal Shroud CAUTION - BATTERY INSTALLATION OR REPLACEMENT MUST BE DONE WITH POWER OFF! The Internal Battery is a 3V Lithium Battery (Panasonic BR2032 or equivalent) that maintains NVRAM and time during outages. It is located on one of the vertical panels inside the Internal Shroud (see Fig. 6.5 above). Under normal conditions, the battery should provide in excess of 10 years of service during storage conditions (disconnected from terminals) or when properly installed in an energized meter. The battery should provide more than one year of service during outage conditions (time on battery backup). A LOW BATTERY indicator on the display screen will tell you when replacement is needed. Installation steps: 1. If you are replacing a battery, download all memory files to your computer. Data may be lost. 2. Remove power from the meter. 3. Remove the external meter cover and the internal shroud. 4. Remove the old battery with a screwdriver or similar tool. 5. Place the new battery in the battery holder according to the directions in Section below. Make sure you place the + facing up. 6. Replace the internal shroud and the external meter cover. 7. Energize the meter. 8. Reset Time using Communicator software. If IRIG-B is connected, time is synchronized automatically. Electro Industries/GaugeTech Doc #: E

82 6.2.1: Battery Holder Detail NOTE: It is very important to insert the replacement battery into the holder correctly. Otherwise proper contact will not be achieved and the meter may lose log memory and time functions. Figure 6.6: Battery Holder Detail STEP A: Make sure the + on the battery is facing UP and toward you. Insert the RIGHT SIDE of the battery UNDER the 2 clips on the right side of the holder while gently pushing the battery against the INSIDE RIGHT WALL of the battery holder (Arrow A). STEP B: Gently push the LEFT SIDE of the battery in until it snaps into place (Arrow B) : Battery Safety and Disposal Do not expose battery to temperatures above 100 degrees C. Do not incinerate, puncture, crush, recharge, short-circuit or over-discharge battery. Do not expose contents of battery to water or to high humidity for extended periods of time. Dispose of batteries in accordance with local, state and federal hazardous waste regulations. NOTE: The replacement of the Modem Battery is detailed in section e Electro Industries/GaugeTech Doc # E

83 6.3: Mounting the Optional Nexus P40N, P41N, P43N LED External Display The Nexus 1262/1272 meter has its own LCD Display on the meter face. The optional Nexus LED Displays: P40N, P41N and P43N, may be used where additional displays are desired. The display mounts using a standard ANSI C39.1 drill plan. Secure the four mounting studs to the back of the panel with the supplied hardware. See Chapter 9 for details on External Displays. Six feet of RS485 communication/power cable harness is supplied. Allow for at least a 1.25-inch (3.17cm) diameter hole in the mounting panel for the cable harness. The display is powered by an external power source, such as the PSIO, which supplies 12 VDC. Each display requires 3 VA (typical). The P40N can draw up to 500 ma in display test mode. See Figure 5.9 for wiring detail (wiring is the same as for the P60N display and Output Modules) Sq. (11.12cm) (3.65cm).75 (19.05mm) Nexus P40N Display, Front View Nexus P40N Display, Side View 3.38 (8.58cm) Sq. 4 X (5.02mm) (10.16cm) ANSI C39.1 Drill Plan (14.28cm) Figure 6.7: Nexus P40N, P41N, P43N LED External Display Mounting Diagrams e Electro Industries/GaugeTech Doc # E

84 6.4: Mounting the Optional Nexus P60N Touch Screen External Display Figure 6.8: Nexus P60N Touch Screen Display Mounting Diagram The P60N Touch Screen Display mounts easily, using these diagrams. A bezel and a gasket are included with the P60N. Since the P60N employs an LCD display, the viewing angle must be considered when mounting. The P60N is powered by an external power source, such as the PSIO. See Figure 5.10 for wiring. NOTE: The P60N WILL NOT display TOU Data. For optimum performance, maintain the following conditions where the Touch Screen Display is mounted: Operating Temperature: (0 to +50) C / (+32 to +122) F Storage Temperature: (-20 to +70) C / (-36 to +158) F Relative Humidity: (25 to 65)% non-condensing NOTE: One of the display-mounting studs MUST be grounded (automatic if mounted in a metal grounded panel). Factory Test Connector Aux Power (PSIO) to pins 4, 5 Meter to 485+, 485- and GND Figure 6.9: Nexus P60N Back Detail e Electro Industries/GaugeTech Doc # E

85 Figure 6.10: Cutout for Nexus P60N Touch Screen Display To mount the P60N, cut an opening in the mounting panel. Follow above cutout dimensions. Carefully drop in the P60N with bezel and gasket attached. See the above figure for details. Fasten the unit securely with the eight nuts supplied with the display. 6.5: Daisy Chain Meters with the P60N Data from up to 8 meters can be accessed with one P60N Display using the steps below: 1. Connect up to 8 meters to one P60N as shown in Figure 6.11 below. 2. Using the P60N face, touch the SETTINGS Button > NEXT > LINK SETTINGS. 3. Touch UP (on the LINK SETTINGS screen) to add an Address. Each slave device in the chain MUST be assigned a UNIQUE ADDRESS. A SAVE Button will appear. 4. Touch the SAVE Button to Save the New Address. 5. Select the Address for the meter from which you want to access data. Chapter 10 details the screens and the Navigational Map for the P60N Display. 6. Click NEXT to select a screen from which you want to retrieve data. Figure 6.11: Daisy Chain Meters with the P60N Touch Screen Display e Electro Industries/GaugeTech Doc # E

86 6.6: Mounting the Nexus External Output Modules Connect multiple Output modules by inserting male RS485 side ports.into female ports, then using a flathead screwdriver, screw each module into the next. Work from left to right. If multiple modules are connected together, as shown in Figure 6.15, (or an individual module is used) secure the mounting brackets to both ends of the group (or individual module) using the screws supplied (#440 pan-head screws). Next, secure the brackets to a flat surface using a #8 screw with a lock washer. The Nexus 1262/1272 meter will NOT supply power for the Output modules. You must use an external power supply, such as the EIG PSIO (12V Output). Figure 6.12 shows the modules mounted without a PSIO Power Supply; Figure 6.15 shows mounting with the PSIO (28.57mm) (0.37mm) 3 x 1.32 (33.27mm) Mounting Bracket 4.1 (104.14mm) Mounting Bracket Figure 6.12: Nexus Output Modules Mounting Diagram, Overhead View Mounting Brackets (MBIO) Female RS-485 Side Port Output Port Male RS-485 Side Port Figure 6.13: Nexus Output Module Communication Ports Electro Industries/GaugeTech Doc # E

87 Nexus Output Modules Mounting Diagram, Front View Mounting Bracket (MBIO) Mounting Bracket (MBIO) 1.25 (31.75mm)+Y Per Module 2.20 (55.87mm) 2x1.10 (27.93mm) 3.44 (87.38mm) Y 1.31 (31.37mm) 0.6 (15.24mm) Figure 6.14 Nexus Output Modules with PSIO Mounting Diagram, Front View Mounting Bracket (MBIO) 1.25 (31.75mm)+Y Per Module+ X Per PSIO Mounting Bracket (MBIO) 2.20 (55.87mm) 2x1.10 (27.93mm) 3.44 (87.38mm) Y 1.31 (31.37mm) X 1.73 (43.94mm) 0.6 (15.24mm) Figure 6.15 Electro Industries/GaugeTech Doc # E

88 Nexus Output Modules Wiring Diagram Auxiliary Power (PSIO) is supplied through pins 4 & 5 Connection through SHIELD, B- & A+ to Nexus 1262/1272 Meter s Port 4 (Detail) Output Port Figure 6.16: Output Module Wiring Detail The Nexus 1262/1272 meter will NOT supply power for the optional external displays or the Output modules. You must use an additional power supply, such as the EIG PSIO. The wiring is the same for all the units. The only difference between the Output modules and the displays is that the port is on the side of the Output module (see Figure 6.13), while the displays have the port on the back. See Chapter 5 for communication details. See Figure 5.11 for wiring details. Electro Industries/GaugeTech Doc # E

89 Chapter 7 Nexus Meter s Time-of-Use Function 7.1: Introduction A Time-of-Use (TOU) usage structure takes into account the quantity of energy used and the time at which it was consumed. The Nexus 1262/1272 meter s TOU function, available with the Communicator EXT software, is designed to accommodate a variety of programmable rate structures. The TOU function accumulates data based on the time-scheme programmed into the Nexus meter. See the Communicator EXT User Manual for details on programming the Nexus 1262/1272 meter s TOU calendar and retrieving TOU data. 7.2: The Nexus Meter s TOU Calendar A Nexus meter s TOU calendar sets the parameters for TOU data accumulation. You may store up to twenty calendars in the Nexus meter and an unlimited amount of calendar files on your computer. The TOU calendar profile allows you to assign a programmable usage schedule eg, Weekday, Weekend, Holiday to each day of the calendar year. You may create up to 16 different TOU schedules. Each TOU schedule divides the 24-hour day into fifteen-minute intervals from 00:00:00 to 23:59:59. You may apply one of eight different programmable registers eg Peak, Off Peak, Shoulder Peak to each fifteen-minute interval. The Nexus meter stores: accumulations on a seasonal basis, up to four seasons per year; accumulations on a monthly basis. Seasonal and monthly accumulations may span one year into the next. Each season and month is defined by a programmable start/billing date, which is also the end-date of the prior season or month. A season ends at midnight of the day before the start of the next season. A month ends at midnight of the month s billing day. If the year ends and there is no new calendar, TOU accumulations will stop. If a calendar is present for the following year, TOU accumulations continue until the next monthly bill date or next start-of-season is reached. Accumulation can span into the following year. If no following year is present, the last accumulation for the year will end on 12:31:23:59:59. Electro Industries/GaugeTech Doc # E

90 7.3: TOU Frozen and Active Registers The Nexus meter stores accumulations for the prior time periods. When the end of a billing period is reached, the Active period of time becomes stored as Frozen. The registers are then cleared and accumulations resume, using the next set of TOU schedules and register assignments from the stored calendar. Frozen and Active Accumulations are always available. 7.4: Updating, Retrieving and Replacing TOU Calendars Communicator EXT software retrieves TOU calendars from the Nexus meter or from the computer s hard drive for review and edit. Up to a maximum of twenty yearly calendars can be stored in the Nexus meter at any given time. You may retrieve them one at a time; a new calendar can be stored while a current calendar is in use. Accumulations do not stop during calendar updates. If a calendar is replaced while in use, the accumulations for the current period will continue until the set end date. At that point, the current time will become the new start time and the settings of the new calendar will be used. Reset the current accumulations, if you replace a calendar in use. A reset clears only the current accumulation registers. This causes the current accumulations to use the present date as the start and accumulate to the next new end date, which will be taken from the new calendar. Once stored, prior accumulations are always available and cannot be reset. See the Communicator EXT User Manual for instructions on resetting current TOU accumulations. At the end of a defined period, current accumulations are stored, the registers are cleared and accumulations for the next period begin. When the year boundary is crossed, the second calendar, if present, is used. To retain continuity, you have up to one year to replace the old calendar with one for the following year. 7.5: Daylight Savings and Demand To use Daylight Savings Time, you must enable it in the Nexus meter s Device Profile, Time Settings. Click Auto DST, which sets Daylight Savings Time automatically (for the United States ONLY). You can also select User Defined and enter the desired dates for Daylight Savings Time. See the Communicator EXT User Manual for details. To set Demand Intervals, from the Device Profile select Revenue & Energy Settings > Demand Integration Intervals and set the desired intervals. Click OK. To set Cumulative Demand Type, from the Device Profile click Revenue & Energy Settings > Cumulative Demand Type and select Block or Rolling Window. Click OK. Electro Industries/GaugeTech Doc #: E

91 Chapter 8 Transformer Loss Compensation 8.1: Introduction The Edison Electric Institute s Handbook for Electricity Metering, Ninth Edition defines Loss Compensation as: A means for correcting the reading of a meter when the metering point and point of service are physically separated, resulting in measurable losses including I 2 R losses in conductors and transformers and iron-core losses. These losses may be added to or subtracted from the meter registration. Loss compensation may be used in any instance where the physical location of the meter does not match the electrical location where change of ownership occurs. Most often this appears when meters are connected on the low voltage side of power transformers when the actual ownership change occurs on the high side of the transformer. This condition is shown pictorially in Figure 8.1. Ownership Change M Figure Figure 9.1: 8.1: Low Low Voltage Metering Installation Requiring Loss Compensation It is generally less expensive to install metering equipment on the low voltage side of a transformer and in some conditions other limitations may also impose the requirement of low-side metering even though the actual ownership change occurs on the high-voltage side. The need for loss compensated metering may also exist when the ownership changes several miles along a transmission line where it is simply impractical to install metering equipment. Ownership may change at the midway point of a transmission line where there are no substation facilities. In this case, power metering must again be compensated. This condition is shown in Figure 8.2. M Point of Ownership Change Figure 9.2: 8.2: Joint Ownership Line Metering Requiring Loss Compensation Electro Industries/GaugeTech Doc # E

92 A single meter cannot measure the losses in a transformer or transmission line directly. It can however, include computational corrections to calculate the losses and add or subtract those losses to the power flow measured at the meter location. This is the method used for loss compensation in the Nexus meter. The computational corrections used for transformer and transmission line loss compensation are similar. Generically, no-load losses and full-load losses are evaluated and a correction factor for each loss level is calculated. However, the calculation of the correction factors that must be programmed into the meter differ for the two different applications. For this reason, the two methodologies will be treated separately in this chapter. In the Nexus meter, Loss Compensation is a technique that computationally accounts for active and reactive power losses. The meter calculations are based on the formulas below. These equations describe the amount of active (Watts) and reactive (VARs) power lost due to both iron and copper effects (reflected to the secondary of the instrument transformers). Total Secondary Watt Loss = (((Measured Voltage/Cal point Voltage) 2 x %LWFE) + ((Measured Current/Cal Point Current) 2 x %LWCU)) x Full-scale Secondary VA Total Secondary VAR Loss = (((Measured Voltage/Cal point Voltage) 4 x %LVFE) + ((Measured Current/Cal Point Current) 2 x %LVCU)) x Full-scale Secondary VA The Values for %LWFE, %LWCU, %LVFE, %LVCU are derived from the transformer and meter information, as demonstrated in following sections. The calculated loss compensation values are added to or subtracted from the measured Watts and VARs. The selection of adding or subtracting losses is made through the meter profile when programming the meter. The meter uses the combination of the add/subtract setting and the directional definition of power flow (also in the profile) to determine how to handle the losses. Losses will be "added to" or "subtracted from" (depending on whether add or subtract is selected) the Received Power flow. For example, if losses are set to "Add to" and received power equals 2000 kw and losses are equal to 20kW then the total metered value with loss compensation would be 2020 kw; for these same settings if the meter measured 2000 kw of delivered power the total metered value with loss compensation would be 1980 kw. Since transformer loss compensation is the more common loss compensation method, the meter has been designed for this application. Line loss compensation is calculated in the meter using the same terms but the percent values are calculated by a different methodology as described in a subsequent section below. Nexus 1262/1272 Meter Transformer Loss Compensation: Performs calculations on each phase of the meter for every measurement taken. Unbalanced loads are accurately handled. Calculates numerically, eliminating the environmental affects that cause inaccuracies in electromechanical compensators. Electro Industries/GaugeTech Doc # E

93 Performs Bidirectional Loss Compensation. Requires no additional wiring; the compensation occurs internally. Imposes no additional electrical burden when performing Loss Compensation. Loss Compensation is applied to 1 second per phase Watt/VAR readings and, because of that, affects all subsequent readings based on 1 second per phase Watt/VAR readings. This method results in loss compensation be applied to the following quantities: Total Power. Demands, per phase and Total (Thermal, Block (Fixed) Window, Rolling (Sliding) Window and Predictive Window). Maximum and Minimum Demands. Energy Accumulations. KYZ Output of Energy Accumulations. NOTE: Loss Compensation is disabled when the meter is placed in Test Mode. 8.2: Nexus 1262/1272 Meter Transformer Loss Compensation The Nexus meter provides compensation for active and reactive power quantities by performing the numerical calculations using factors derived by clicking the TLC Calculator button on the Transformer Loss screen of the Device Profile or by manually figuring values in section 8.2.1, Calculating Transformer Loss Compensation Percentages (Work Sheet). Enter the derived values in the Device Profile screen of the Communicator EXT software (values will automatically be entered from the TLC Calculator button). The Communicator EXT software allows you to enable Transformer Loss Compensation for Losses due to Copper and Iron, individually or simultaneously. Losses can either be added to or subtracted from measured readings. Loss compensation values must be calculated based on the meter installation. As a result transformer loss values must be normalized to the meter by converting the base voltage and current and taking into account the number of elements used in the metering installation. For three element meters, the installation must be normalized to the phase-to-neutral voltage and the phase current; in two element meters the installation must be normalized to the phase-to-phase voltage and the phase current. This process is described in the following sections. Electro Industries/GaugeTech Doc # E

94 8.2.1: Loss Compensation in Three Element Installations Loss compensation is based on the loss and impedance values provided on the transformer manufacturer s test report. A typical test report will include at least the following information: Manufacturer Unit Serial Number Transformer MVA Rating (Self-Cooled) Test Voltage No Load Loss Watts Load Loss Watts (or Full Load Loss Watts) % Exciting 100% voltage % Impedance The transformer MVA rating is generally the lowest MVA rating (the self-cooled or OA rating) of the transformer winding. The test voltage is generally the nominal voltage of the secondary or low voltage winding. For three phase transformers these values will typically be the three-phase rating and the phase-to-phase voltage. All of the test measurements are based on these two numbers. Part of the process of calculating the loss compensation percentages is converting the transformer loss values based on the transformer ratings to the base used by the meter. Correct calculation of loss compensation also requires knowledge of the meter installation. In order to calculate the loss compensation settings you will need the following information regarding the meter and the installation: Number of meter elements Potential Transformer Ratio (PTR) Current Transformer Ratio (CTR) Meter Base Voltage Meter Base Current This section is limited to application of Nexus meters to three-element metering installations. As a result, we know that: Number of metering elements = 3 Meter Base Voltage = 120 Volts Meter Base Current = 5 amps The loss compensation values can be calculated by clicking the TLC Calculator button on the Transformer Loss screen of the Nexus meter s Device Profile (MS Excel Spreadsheet) or by completing the worksheet Three Element Loss Compensation Worksheet below. In order to activate the Excel Spreadsheet, you must have MS Excel installed on your computer. NOTE: A copy of the Excel Spreadsheet with Example Numbers can be found in Appendix A of this manual. Electro Industries/GaugeTech Doc # E

95 : Three Element Loss Compensation Worksheet Company Date Trf Manf Calculation by Station Name Trf Bank No. Trf Serial No. Transformer Data (from Transformer Manufacturer s Test Sheet) Winding Voltage MVA HV - High Xv - Low YV - Tertiary Connection - Y - Y - Y Value 3-Phase Watts Loss 1-Phase 1-Phase kw No-Load Loss Load Loss Enter 3-Phase or 1-Phase values. If 3-Phase values are entered, calculate 1-Phase values by dividing 3-Phase values by three. Convert 1-Phase Loss Watts to 1-Phase kw by dividing 1-Phase Loss Watts by Value 3-Phase MVA 1-Phase MVA 1-Phase kva Self-Cooled Rating Enter 3-Phase or 1-Phase values. If 3-Phase values are entered, calculate 1-Phase values by dividing 3-Phase values by three. Convert 1-Phase Self-Cooled MVA to 1-Phase kva by multiplying by % Exciting Current % Impedance Value Phase-to-Phase Phase-to-Neutral Test Voltage (volts) Full Load Current (Amps) Test Voltage is generally Phase-to-Phase for three-phase transformers. Calculate Phase-to-Neutral Voltage by dividing Phase-to-Phase Voltage by 3. Calculate Full Load Current by dividing the (1-Phase kw Self-Cooled Rating) by the (Phase-to-Neutral Voltage) and multiplying by Electro Industries/GaugeTech Doc # E

96 Meter/Installation Data Instrument Transformers Numerator Denominator Multiplier Potential Transformer Current Transformer Power Multiplier [(PT Multiplier) times (CT Multiplier)] Enter the Numerator and Denominator for each instrument transformer. For example, a PT with a ratio of 7200/120 has a numerator or 7200, a denominator or 120 and a multiplier of 60 ( 7200/120 = 60/1). Meter Secondary Voltage (volts) 120 Meter Secondary Current (amps) 5 Base Conversion Factors Quantity Voltage Current Transformer Multiplier Trf IT Sec Meter Base Meter/Trf For Transformer Voltage, enter the Phase-to-Neutral value of Test Voltage previously calculated. For Transformer Current, enter the Full-Load Current previously calculated. For Multipliers, enter the PT and CT multipliers previously calculated. TrfIT Secondary is the Base Value of Voltage and Current at the Instrument Transformer Secondary of the Power Transformer. These numbers are obtained by dividing the Transformer Voltage and Current by their respective Multipliers. The Meter/Trf values for Voltage and Current are obtained by dividing the Meter Base values by the TrfIT Secondary values. Load Loss at Transformer No-Load Loss Watts (kw) = 1-Phase kw No-Load Loss = No-Load Loss VA (kva) = (%Exciting Current) * (1-Phase kva Self-Cooled Rating) / 100 = ( ) * ( ) / 100 = kva No-Load Loss VAR (kvar) = SQRT((No-Load Loss kva) 2 - (No-Load Loss kw) 2 ) = SQRT(( ) 2 - ( ) 2 ) = SQRT(( ) - ( )) = SQRT ( ) = Electro Industries/GaugeTech Doc # E

97 Full-Load Loss Watts (kw) = 1-Phase Kw Load Loss = Full-Load Loss VA (kva) = (%Impedance) * (1-Phase kva Self-Cooled Rating) / 100 = ( ) * ( ) / 100 = kva Full-Load Loss VAR (kvar) = SQRT((Full-Load Loss kva) 2 - (Full-Load Loss kw) 2 ) = SQRT(( ) 2 - ( ) 2 ) = SQRT(( ) - ( )) = SQRT ( ) = Normalize Losses to Meter Base Quantity Value at Trf Base M/T Factor M/T Factor Value Exp M/T Factor w/ Exp Value at Meter Base No-Load Loss kw V 2 No-Load Loss kvar V 4 Load Loss kw I 2 Load Loss kvar I 2 Enter Value at Transformer Base for each quantity from calculations above. Enter Meter/Trf Factor value from Base Conversion Factor calculations above. Calculate M/T Factor with Exponent by raising the M/T Factor to the power indicated in the Exp (or Exponent) column. Calculate the Value at Meter Base by multiplying the (M/T Factor w/ Exp) times the (Value at Trf Base). Loss Watts Percentage Values Meter Base kva = 600 * (PT Multiplier) * (CT Multiplier) / 1000 = 600 * ( ) * ( ) / 1000 = Electro Industries/GaugeTech Doc # E

98 Calculate Load Loss Values Quantity Value at Meter Base Meter Base kva % Loss at Meter Base Quantity No-Load Loss kw % Loss Watts FE No-Load Loss kvar % Loss VARs FE Load Loss kw % Loss Watts CU Load Loss kvar % Loss VARs CU Enter Value at Meter Base from Normalize Losses section. Enter Meter Base kva from previous calculation. Calculate % Loss at Meter Base by dividing (Value at Meter Base) by (Meter Base kva) and multiplying by 100. Enter calculated % Loss Watts values into the Nexus meter using Communicator EXT software. Electro Industries/GaugeTech Doc # E

99 Chapter 9 Using the Nexus External Displays 9.1: Overview The Nexus 1262/1272 Socket Meters have a backlit LCD display built into the meter. In addition, Electro Industries offers two optional external displays, each powered by an additional power supply (such as PSIO). The P40N is our LED display, which provides easy-to-use access to the information stored in the Nexus meter. The P60N is our Touch Screen Display, which provides easy access to Nexus meter readings and information combined with a graphical touch screen presentation. Plug one of the Nexus External Displays into the Port 1 or Port 4 wiring connection using the RS485 cable supplied (see Figure 6.11 for wiring details). The Displays operate at 9600 baud. To use the Displays on another port, configure that port to operate at 9600 baud, using the Communicator EXT Software; see the Communicator EXT User Manual. 9.2: Nexus P40N LED External Display The Nexus P40N LED External Display has three modes: Dynamic Readings Mode (sections 9.3 and 9.4) Nexus Information Mode (sections 9.5 and 9.6) Display Features Mode (sections 9.7 and 9.8) Each Mode is divided into Groups. Most Groups are further broken down into Readings. Use the MODE button to scroll between Modes. Use the UP/DOWN arrows to scroll from Group to Group within each Mode. Use the LEFT/RIGHT arrows to scroll from Reading to Reading within each Group. Use Communicator EXT software to Flash Update the P40N External Display. VA Rating is 5. LED Display Up/Down Arrows Figure 9.1: Nexus P40N LED External Display Left/Right Arrows Mode Button e Electro Industries/GaugeTech Doc # E

100 9.3: Dynamic Readings Mode The External Display puts itself in the Dynamic Readings Mode upon power-up. Use the MODE button to access the Dynamic Readings from other Modes. Use the UP/DOWN arrows to navigate from Group to Group within this Mode. See section 9.4 for a navigational map of the Dynamic Readings Mode. Group 1: Phase to Neutral Voltages (Use the LEFT/RIGHT arrows to access the following readings, in order.) Volts AN/BN/CN Maximum Volts AN/BN/CN Minimum Volts AN/BN/CN Volts AN/BN/CN %THD Volts AN/BN/CN Maximum %THD Volts AN/BN/CN Minimum %THD Group 2: Phase to Phase Voltages (Use the LEFT/RIGHT arrows to access the following readings, in order.) Volts AB/BC/CA Maximum Volts AB/BC/CA Minimum Volts AB/BC/CA Group 3: Current (Use the LEFT/RIGHT arrows to access the following readings, in order.) Current A/B/C Maximum Current Minimum Current Current %THD Current Maximum %THD Current Minimum %THD Current Calculated N/Measured N Maximum Current Calculated N/Measured N Group 4: Watt/VAR (Use the LEFT/RIGHT arrows to access the following readings, in order.) kwatt/kvar Maximum +kwatt/+kvar/coin kvar Maximum -kwatt/-kvar/coin kvar Fixed (Block) Window Average Maximum +kwatt/+kvar/coin kvar Predictive Sliding (Rolling) Window Maximum +kwatt/+kvar/coin kvar Group 5:VA/PF/Frequency (Use the LEFT/RIGHT arrows to access the following readings, in order.) kva/pf lag/hz Maximum kva/hz Minimum kva/hz e Electro Industries/GaugeTech Doc # E

101 Maximum Quadrant 1 Total PF Minimum Quadrant 1 Total PF Maximum Quadrant 2 Total PF Minimum Quadrant 2 Total PF Maximum Quadrant 3 Total PF Minimum Quadrant 3 Total PF Maximum Quadrant 4 Total PF Minimum Quadrant 4 Total PF Group 6: Delivered Energy (Use the LEFT/RIGHT arrows to access the following readings, in order.) +kwatthr Quadrant 1+Quadrant 4 (Primary) +kvahr Quadrant 1 (Primary) +kvarhr Quadrant 1 (Primary) +kvahr Quadrant 4 (Primary) -kvarhr Quadrant 4 (Primary) Group 7: Received Energy (Use the LEFT/RIGHT arrows to access the following readings, in order.) -kwatthr Quadrant 2+Quadrant 3 (Primary) +kvahr Quadrant 2 (Primary) +kvarhr Quadrant 2 (Primary) +kvahr Quadrant 3 (Primary) -kvarhr Quadrant 3 (Primary) Group 8: Accumulations (Use the LEFT/RIGHT arrows to access the following readings, in order.) ki 2 t A ki 2 t B ki 2 t C kv 2 t A kv 2 t B kv 2 t C Group 9: Phase Angles (Use the LEFT/RIGHT arrows to access the following readings, in order.) Phase Angle Van/bn/cn Phase Angle Ia/b/c Phase Angle Vab/bc/ca Phase Sequence e Electro Industries/GaugeTech Doc # E

102 9.4: Navigational Map of Dynamic Readings Mode Use LEFT/RIGHT arrow keys to navigate Readings Use UP/DOWN arrows to scroll between groups. G ro u p s 1 Second Volts AN,BN,CN Maximum Volts AN,BN,CN Minimum Volts AN,BN,CN %THD Volts AN,BN,CN Max %THD Volts AN,BN,CN Min %THD Volts AN,BN,CN Return to First Reading 1 Second Volts AB,BC,CA Maximum Volts AB,BC,CA Minimum Volts AB,BC,CA Return to First Reading 1 Second IA,IB,IC Maximum IA,IB,IC Minimum IA,IB,IC %THD IA,IB,IC Max %THD IA,IB,IC Min %THD IA,IB,IC 1 Second INc,INm Return to First Reading 1 Second kwatt, kvar +Max kwatt, +kvar,coin kvar -Max kwatt, -kvar,coin kvar Block WinAvg Max +kwatt, +kvar,coin kvar Pred Roll Win Avg +kwatt, +kvar,coin kvar Return to First Reading 1 Second kva, PF lag, Frequency Max kva, Freq Min kva, Freq Max Q1, Total PF Min Q1, Total PF Max Q2, Total PF Min Q2, Total PF Max Q3, Total PF Min Q3, Total PF Min Q4, Total PF Min Q4, Total PF Return to First Reading Positive kwatthour Q1+Q4 Positive kvahr Q1 Positive kvarhr Q1 Positive kvahr Q4 Negative kvarhr Q4 Return to First Reading Negative kwatthr Q2+Q3 Positive kvahr Q2 Positive kvarhr Q2 Positive kvahr Q3 Negative kvarhr Q3 Return to First Reading ki 2 t A ki 2 t B ki 2 t C kv 2 t A kv 2 t B kv 2 t C Return to First Reading Phase Angles V AN,BN,CN Phase Angles I A,B,C Phase Angles V AB,BC,CA Phase Sequence Return to First Reading Electro Industries/GaugeTech Doc # E

103 9.5: Nexus Information Mode Use the MODE button to access the Nexus Information Mode from other Modes. Use the UP/DOWN arrows to navigate from Group to Group within this Mode. See Section 9.6 for a navigational map of the Nexus Information Mode. Group 1: Device Time Meter Time Group 2: Communication Settings (Use the LEFT/RIGHT arrows to access the following readings, in order.) Communication Settings Port 1: Baud/Addr/Protocol Communication Settings Port 2: Baud/Addr/Protocol Communication Settings Port 3: Baud/Addr/Protocol Communication Settings Port 4: Baud/Addr/Protocol Group 3: PT, CT Ratios (Use the LEFT/RIGHT arrows to access the following readings, in order.) PT Ratio CT Ratio Group 4: External Display Units Primary/Secondary Select either Primary or Secondary units for the External Display using the Communicator EXT software (see the Communicator EXT User Manual).When Primary is selected, the Display shows all readings in Primary units based on the user programmed PT and CT Ratios. When Secondary is selected, the Display shows all readings in Secondary units. Group 5: Firmware Versions and Serial Numbers (Use the LEFT/RIGHT arrows to access the following readings, in order.) RunTime External Display/RunTime DSP/RunTime Comm Boot External Display/Boot DSP/Boot Comm Serial Number External Display; Serial Number Nexus Meter e Electro Industries/GaugeTech Doc # E

104 9.6: Navigational Map of Information Mode Use UP/DOWN arrows to scroll between groups. Use LEFT/RIGHT arrows to scroll between readings. Readings G ro u p s Meter Time Comm Settings Port 1 Comm Settings Port 2 Comm Settings Port 3 Comm Settings Port 4 Return To First Reading PT Ratio CT Ratio Return To First Reading Display Primary/Secondary Run-time Display, DSP, Comm Boot Display, DSP, Comm Serial # Display, Serial # Monitor Return To First Reading Electro Industries/GaugeTech Doc # E

105 9.7: Display Features Mode Use the MODE button to access the Display Features Mode from other Modes. Use the UP/DOWN arrows to navigate from Group to Group within this Mode. See section 9.8 for a navigational map of the Display Features Mode. Group 1: Reset Max/Min Note: If the password protection feature has been enabled with the Communicator EXT software, you will need to enter a password to reset the max/min readings. To do this, first press the Enter button. Then enter the password, one character at a time, by pressing on the UP or DOWN arrows. Each password character begins as an A. Press the UP arrow to increment the character from A Z and then from 0 9. Press the DOWN arrow to decrement the character from A to 9 0 and then from Z A. Press SET to enter each character the password. When the entire password is shown on the Display screen, press ENTER. If the password is correct you may then press Enter again to Reset the Energy readings. Press the Enter button to reset the Max and Min values. Group 2: Reset Energy Note: If the password protection feature has been enabled with the Communicator EXT software, you will need to enter a password to reset the energy. To do this, first press the Enter button. Then enter the password, one character at a time, by pressing on the UP or DOWN arrows. Each password character begins as an A. Press the UP arrow to increment the character from A Z and then from 0 9. Press the DOWN arrow to decrement the character from A to 9 0 and then from Z A. Press SET to enter each character the password. When the entire password is shown on the Display screen, press ENTER. If the password is correct you may then press Enter again to Reset the Energy readings. Press Enter button to reset the Max and Min values. Group 3: Display Baud Rate/Address Group 4: Display Communication Protocol Group 5: EIG Use Only Group 6: EIG Use Only Group 7: Lamp Test Press Enter to conduct an LED test. Group 8: Display Scroll ON/OFF Press Enter to turn the scroll feature on or off. When the scroll feature is on, the P40N External Display will scroll through the first reading of each group in the Dynamic Readings Mode. If a button is pressed during the scroll, scrolling pauses for one minute. e Electro Industries/GaugeTech Doc # E

106 9.8: Navigational Map of Display Features Mode Use UP/DOWN arrows to scroll between groups. G ro u p s Reset Max/Min Reset Energy Baud Rate/Address Communication Protocol EIG Use Only EIG Use Only Lamp Test Display Scroll On/Off Electro Industries/GaugeTech Doc # E

107 9.9: Nexus P60N Touch Screen External Display The P60N Touch Screen External Display is ready to use upon power-up. Touching the buttons at the top of the screen will take you to the Groups of Readings listed below. With the buttons at the bottom of the screen, you can use the touch screen to review Limits and review and/or change Settings on the Display and the Nexus Monitor. Also, you can Reset Max/Min and Demand, Hour, I 2 T and V 2 T Counters, All Logs and TOU for Current Session and Month using the Reset Button. The P60N has a VA Rating of 5 and is powered by an external power source, such as the PSIO. See Figures 6.9 and 6.11 for wiring detail. All screens have a Main button that will take you back to the Main screen. All screens also have a Next button that will take you to the next group of readings. Some of the screens have additional navigation buttons to take you to complimentary readings. See section 9.10 for a navigational map. General Page Groups of Readings Reset Button View Limits View / Change Settings Figure 9.5: Nexus P60N Touch Screen External Display GENERAL PAGE: Overview of Real Time Readings Volts AN/BN/CN/AB/BC/CA Amps A/B/C Watts VARS VA FREQ PF Electro Industries/GaugeTech Doc # E

108 VOLTS: Voltage Readings Details Real Time Volts AN/BN/CN/AB/BC/CA Maximum Volts AN/BN/CN/AB/BC/CA Minimum Volts AN/BN/CN/AB/BC/CA Touch PH-N or PH-PH to view details of Phase-to-Neutral or Phase-to-Phase Readings. VOLTS: Voltage Readings PH-N Volts AN/BN/CN Touch BACK to return to the Volts main screen. VOLTS: Voltage Readings PH-PH Volts AB/BC/CA Touch BACK to return to the Volts main screen. AMPS: Current Readings Details Real Time Current A/B/C Maximum Current A/B/C Minimum Current A/B/C Current Calculated N/Measured N Maximum Current Calculated N/ Measured N Touch A-B-C to view Current Detail. Electro Industries/GaugeTech Doc #: E

109 AMPS: Current Readings A-B-C Real Time Current A/B/C Touch BACK to view the Amps main screen. REAL TIME POWER: Real Time Power Readings Details (Demand button goes to Demand Power screen.) Instant Watt/VAR/VA/PF Average Watt/VAR/VA/PF Predicted Watt/VAR/VA/PF Touch the DEMAND button to go to the Demand Power screen (shown below). DEMAND POWER: Demand Power Readings Details Thermal Window Average Maximum +kwatt/+kvar/coin kvar Block (Fixed) Window Average Maximum +kwatt/+kvar/coin kvar Predictive Rolling (Sliding) Window Maximum +kwatt/+kvar/coin kvar Touch R/T button to view Real Time Power screen. ENERGY: Accumulated Energy Information -Watthr Quadrant 2+Quadrant 3 (Primary) +VAhr Quadrant 2 (Primary) +VARhr Quadrant 2 (Primary) +VAhr Quadrant 3 (Primary) -VARhr Quadrant 3 (Primary) +Watthr Quadrant 1+Quadrant 4 (Primary) +VAhr for all Quadrants (Primary) Touch TOU button to view TOU Register Accumulations screen. Electro Industries/GaugeTech Doc # E

110 TOU: Accumulations -Watthr Quadrant 2+Quadrant 3 (Primary) +VAhr Quadrant 2 (Primary) +VARhr Quadrant 2 (Primary) +VAhr Quadrant 3 (Primary) -VARhr Quadrant 3 (Primary) +Watthr Quadrant 1+Quadrant 4 (Primary) +VAhr Quadrants 1 & 4 (Primary) -VARhr Quadrant 4 (Primary) Touch DEMAND to view Register Demand screen. Touch Next Reg to scroll Registers 1-8 and Totals. Touch Next Group to scroll Prior Season, Prior Month, Current Season, Current Month. TOU: Register Demand Block (Fixed) Window +kwatth, +kvarh, -kwatth, -kvarh, Coin +kvarh, Coin -kvarh Touch ACCUM to view TOU Accumulations. Touch Next Reg to scrol Registers 1-8 and Totals. Touch Next Group to scroll Prior Season, Prior Month, Current Season, Current Month. FLICKER - INSTANTANEOUS: Time Start/Reset, Stop, Current, Next PST, PLT Status (Active or Stopped) Frequency Base Voltage Touch SHORT TERM or LONG TERM to view other Flicker screens. START or STOP will appear, depending on Status. FLICKER - SHORT TERM: Volts A/B/C Max Volts A/B/C Min Volts A/B/C Touch INST or LONG TERM to view screens. START or STOP will appear, depending on Status. Electro Industries/GaugeTech Doc # E

111 FLICKER - LONG TERM: Volts A/B/C Max Volts A/B/C Min Volts A/B/C Touch INST or SHORT TERM to view screens. START or STOP will appear, depending on Status. LIMITS: Limit Status. Current Limits Settings for Nexus Meters ID For each ID number, the Type of Reading, Value, Status (In or Out of Limit) and Setting is shown. The first screen displays the settings for Meters ID 1 to 8. Touch NEXT GROUP to scroll to the next screen, which displays the settings for Meters ID 9 to 16. Touch NEXT GROUP again to view settings for Meters ID 17 to 24 and 25 to 32. PHASORS: Phasor Analysis Phase Angles for Form shown at top right of screen. Phase Phase Angle Van/bn/cn Phase Angle Ia/b/c Phase Angle Vab/bc/ca WAVEFORM: Real Time Waveform Graph Channel Va/b/c Channel Ia/b/c % THD, KFactor, Frequency for selected channel Touch CHANNEL button to scroll through channels. Electro Industries/GaugeTech Doc #: E

112 SPECTRUM: Harmonic Spectrum Analysis. Select a Channel by touching the CHANNEL button. Graphs and readings appear for the selected channel. Zoom In or Out for detail by touching IN or OUT. REAL TIME TRENDING ANALYSIS: Select a Channel by touching the CHANNEL button. The Channel Selector screen (shown below) appears. Select a Channel and touch OK to select a Channel and return to this screen. Trending for the Selected Channel will begin on this screen. To see a Detail of logs for the Selected Channel, touch the DETAIL button. A Table of Logs for the Selected Channel appears (Volts AN shown below). Touch PREVIOUS LOGS to view other logs. REAL TIME TRENDING CHANNEL SELECTOR: Select Channel by touching a CHANNEL button. The Active Channel appears at the lower right. Data from the previously Active Channel will be lost if the Channel is changed. The Time Interval for Trending appears at the bottom of the screen. To increse the Interval, touch the UP button. To decrease the Interval, touch DN (Down). Touch OK to return to Trending Analysis screen. REAL TIME TRENDING DETAIL: A Table of Logs for the Selected Channel (Volts AN shown here). Touch BACK to return to the Trending Analysis screen. Touch PREVIOUS LOGS to view other logs. Electro Industries/GaugeTech Doc # E

113 LOG STATUS: Logging Statistics An Overview of the Logs for the Primary Meter. The Number of Records and Memory Used are listed for each log. RESET: Meter Reset Commands. WARNING! RESETS cause data to be lost. Touch the window for the Reset you want to perform. Don t Reset changes to Reset. Touch RESET NOW button. OK will appear. Touch OK to refresh screen (go back to original screen). Max/Min and Demand. Hour, I 2 T and V 2 T Counters. All Logs. TOU for Current Season and Month. SETTINGS: LCD Screen Settings: Contrast. Touch Up/Down buttons to increase/decrease settings. Number 37 is optimum setting. Backlight Off Delay (number of seconds after use that backlight turns off). (A setting of 0 keeps the Back Light ON). Touch Up/Down buttons to increase/decrease settings. NEXUS LINK SETTINGS: Nexus Address ( ). Touch Up/Down buttons to increase/decrease settings. Protocol (selected). Baud (selected). To Add an Address: Click UP to Add an Address. SAVE Button will appear. Click SAVE to Save the New Address. Electro Industries/GaugeTech Doc #: E

114 Nexus Meter Port Settings: Port 1 (Baud and Protocol selected). Port 2 (Baud and Protocol selected). Port 3 (Baud and Protocol selected). Port 4 (Baud and Protocol selected). Nexus Meter Status: Device Type: Nexus 1262 meter Serial Number (10 digit number) Comm State: Healthy or Unhealthy Nv Ram: 4 MB DSP State: Healthy or Unhealthy Protection: Password Enabled or Disabled On Time: Current Date and Time Firmware Versions: Nexus 1262 meter Boot: Run-time: DSP Boot: DSP Run-time: LCD Display: This screen displays the current firmware version for the Nexus meter and the display. Electro Industries/GaugeTech Doc # E

115 9.10: Navigational Map for P60N Touch Screen External Display Electro Industries/GaugeTech Doc # E

116 9.11: Optional P40N, P41N, P43N LED External Display Specifications Specification Maximum Input Voltage Minimum Input Voltage VA Rating Nominal Power Consumption Operating Temperature Range Overall Dimensions (HxWxL) P40N, P41N, P43N LED Displays 30V DC 7V DC 3.0 VA (typical)* Approximately 3 Watts -20 o C to +60 o C / -4 o F to +140 o F 2.2 x 4.4 x 4.4 in / 5.9 x 11.1 x 11.1 cm * 3.0 VA typical for P40N 2005 or later. (VA Ratings for P41N and P43N are all 3.0 VA.) 8.0 VA typical for P40N 2004 or earlier. 9.12: Optional P60N Touch Screen Remote Display Specifications Specification Maximum Input Voltage Minimum Input Voltage VA Rating Nominal Power Consumption Operating Temperature Range Overall Dimensions (HxWxL) P60N Touch Screen Display 30V DC 10V DC 5.0 VA (typical) Approximately 5 Watts 0 o C to +50 o C / +32 o F to +122 o F 1.6 x 5.4 x 8.0 in / 4.0 x 13.7 x 20.3 cm Electro Industries/GaugeTech Doc # E

117 Chapter 10 Nexus External Output Modules 10.1: Hardware Overview All Nexus External Output modules have the following components: Female RS485 Side Port: use to connect to another module s male RS485 side port. Male RS485 Side Port: use to connect to the Nexus meter s Port 4 or to another module s female RS485 side port. See Figure 10.2 for wiring detail. Output Port: used for functions specific to the type of module; size and pin configuration vary depending on type of module. Reset Button: Press and hold for three seconds to reset the module s baud rate to and its address to 247 for 30 seconds. LEDs: when flashing, signal that the module is functioning. Mounting Brackets (MBIO): used to secure one or more modules to a flat surface. Mounting Brackets (MBIO) Female RS485 Side Port LEDs Output Port (Size and pin configuration vary) Integrated Fastening System Male RS485 Side Port Reset Button Figure 10.1: Output Module Components Electro Industries/GaugeTech Doc # E

118 10.1.1: Port Overview All Electro Industries Output Modules have ports through which they interface with other devices. The port configurations are variations of the three types shown below. Four Analog Outputs Eight Analog Outputs Four Relay Outputs (0-1mA and 4-20mA) (0-1mA and 4-20mA) or Four KYZ Pulse Outputs Electro Industries/GaugeTech Doc # E

119 10.2: Installing Nexus External Output Modules Output modules must use the Nexus 1262/1272 meter s Port 4. Six feet of RS485 cable harness is supplied. Attach one end of the cable to the port (connectors may not be supplied); insert the other end into the communication pins of the module s Male RS485 Side Port. Follow steps below and see Figure 10.2 below. See Section 10.3 for details on using multiple Output modules. LED s Male Side Port on Nexus Output Module R T R T * (For runs typically longer than 500 feet) Nexus 1262/1272 Meter s Port 4 Figure 10.2: Nexus Meter Connected to Output Module * NOTE: Termination Resistors are only needed with runs typically more than 500 feet. The meter has some level of termination internally and usually resistors are not needed. Electro Industries/GaugeTech Doc # E

120 10.2.1: Power Source for Output Modules The Nexus 1262/1272 meter will not supply power to the Output modules. You must use an external power source, such as the PSIO (12V) (or PB1). Refer to sections and to determine power needed. RS485 communication is viable for up to 4000 feet (1219 meters). You must also do the following: 1. Connect the A(+) and B(-) terminals on the meter to the A(+) and B(-) terminals of the male RS485 port. Connect the shield to the shield (S) terminal. The (S) terminal on the meter is used to reference the meter s port to the same potential as the source. It is not an earth ground connection. You may also connect the shield to earth-ground at one point. 2. Put termination resistors at each end, connected to the A(+) and B(-) lines. RT is ~120 Ohms. 3. Connect a power source to the front of the module. (Refer to Section 5.3 for RT Explanation.) SIDE LABEL Figure 10.3: The PSIO Power Source (Side View) showing Male RS485 Side Port TOP LABEL Figure 10.4: Power flow from PSIO to Output Module Figure 10.5: Labels for the PSIO Power Source (Labels are Red & White.) Electro Industries/GaugeTech Doc # E

121 10.3: Using Multiple Output Modules Female RS485 Side Port LEDs Communication ONLY A+, B- and Shield Control Power Reset Button Mounting Bracket Output Port (Size and pin configuration vary) Output Modules must use the Nexus 1262/1272 Meter s Port 4. Set the port to Baud, Output Module. Group of 3 Output Modules RS485 Cable External Power Source Addr 160 Addr 128 Addr 156 PSIO 12VA Figure 10.6: Multiple Output Modules : Steps for Attaching Multiple Output Modules 1. Each Output module in a group must be assigned a unique address. See the Communicator EXT User Manual for details on configuring and programming the Output Modules. 2. Determine how many power sources (such as PSIO) are needed for the number of modules in use. See Section for details. Electro Industries/GaugeTech Doc # E

122 3. Starting with the left module and using a slotted screw driver, fasten the first Output Module to the left Mounting Bracket. The left Mounting Bracket is the one with the PEM. Fasten the internal screw tightly into the left Mounting Bracket. 4. Next, slide the female RS485 port into the male RS485 side port to connect the next Output module to the left module. Fasten together enough to grab but do not tighten. One by one combine the modules together using the Integrated Fastening System (Fig. 10.1). If you require an additional power supply, attach a PSIO (power supply) to the right of each group of 4 Output modules (see Section 10.3). NOTE: The PB1 can also be used for a Low Voltage Power Supply. It must be mounted separately. 5. Once you have combined all the Output modules together for the group, fasten tightly. This final tightening will lock the whole group together as a unit. 6. Attach the right Mounting Bracket to the right side of the group using the small phillips head screws provided. 7. Then, mount the group of modules on a secure, flat surface. This procedure will ensure that all modules stay securely connected. 10.4: Factory Settings and Reset Button Factory Settings: All Nexus Output modules are shipped with a preset address and a baud rate of See the list shown below, for module addresses. Reset Button: If there is a communication problem or if you are unsure of a module s address and baud rate, press and hold the RESET button for 3 seconds. The module will reset to a default address of 247 at baud rate for 30-seconds. This will enable you to interrogate the module using the Communicator EXT software; see the Modbus Communicating Output Modules User Manual. Model # Module Factory-Set Address 1mAON4 0±1mA, 4-Channel Analog Output 128 1mAON8 0±1mA, 8-Channel Analog Output mAON4 4 20mA, 4-Channel Analog Output mAON8 4 20mA, 8-Channel Analog Output 132 4RO1 4 Latching Relay Outputs 156 4PO1 4 KYZ Pulse Outputs 160 Electro Industries/GaugeTech Doc # E

123 10.5: Analog Transducer Signal Output Modules Analog Transducer Signal Output Modules Specifications 1mAON4: 4-Channel Analog Output, 0±1mA Model Numbers 1mAON8: 8-Channel Analog Output, 0±1mA 20mAON4: 4-Channel Analog Output, 4 20mA 20mAON8: 8-Channel Analog Output, 4 20mA Accuracy Scaling Communication Power Requirement Operating Temperature Maximum Load Impedance Factory Settings 0.1% of Full Scale Programmable RS485, Modbus RTU Programmable Baud Rates: 4800, 9600, 19200, V dc at mA; Nexus 1262/1272 Unit's Power Supply DOES NOT Support Output Modules (-20 to 79) C / (-4 to +158) F 0±1mA: 10k Ω; 4 20mA: 500 Ω Modbus Address: 1mAON4, 0-1mA: 128 1mAON8, 0-1mA: mAON4, 4 20mA: 132, 20mAON8, 4-20mA: 132 Baud Rate: Transmit Delay Time: 0 Default Settings (Reset Button) Modbus Address: 247 Baud Rate: Transmit Delay Time: 20 csec : Overview The Analog Transducer Signal Output Modules (0±1mA or 4 20mA) are available in either a 4- or 8-channel configuration. Maximum registers per request, read or write, is 17 registers. The Nexus 1262/1272 unit does not supply power for the Analog Output modules. See Section 10.2 for power and communication details. All outputs share a single common point. This is also an isolated connection (from ground). Electro Industries/GaugeTech Doc # E

124 The Modbus Map for the Analog Output Module (and operating details) can be found in the Modbus Communicating Output Modules Manual : Normal Mode Normal Mode is the same for the 0-1mA and the 4-20mA Analog Output Modules except for the number of processes performed by the modules. Both devices: 1. Accept new values through communication. 2. Output current loops scaled from previously accepted values. The 0-1mA module includes one more process in its Normal Mode:. 3. Read and average the A/D and adjust values for Process 2 above. The device will operate with the following default parameters: Address 247 (F7H) Baud Rate Baud Transmit Delay Time 0 Normal Operation is prevented by a number of occurrences. See Section for details. Electro Industries/GaugeTech Doc # E

125 10.6: Digital Dry Contact Relay Output (Form C) Module Digital Dry Contact Relay Output (Form C) Module Specifications Model Number Accuracy Scaling Communication Power Requirement Operating Temperature 4RO1: 4 Latching Relay Outputs 0.1% of Full Scale Programmable RS485, Modbus RTU Programmable Baud Rates: 4800, 9600, 19200, V dc at ma; Nexus 1262/1272 Unit's Power Supply DOES NOT Support Output Modules (-20 to 79) C / (-4 to +158) F Maximum Load Impedance 0-1mA: 10k Ω; 4-20mA: 500 Ω Modbus Address: 156 Factory Settings Baud Rate: Transmit Delay Time: 0 Default Settings (Reset Button) Modbus Address: 247 Baud Rate: Transmit Delay Time: 20 csec : Overview The Relay Output Module consists of four Latching Relay Outputs. In Normal Mode, the device accepts commands to control the relays. Relay output modules are triggered by limits programmed with the Communicator EXT software. See the Communicator EXT User Manual for details on programming limits. The Nexus 1262/1272 unit does not supply power for the Relay Output modules. A power source is required. See Section 10.2 for power and communication details. The Modbus Map for the Relay Output Module (and operating details) can be found in the Modbus Communicating Output Modules Manual. Each latching relay will hold its state in the event of a power loss. Electro Industries/GaugeTech Doc # E

126 10.6.2: Communication Maximum registers per request, read or write, is 4 registers.orm The device will operate with the following Default Parameters: Address 247 (F7H) Baud Rate Baud Transmit Delay Time 20 csec Some situations will cause the device to operate with the above Default Parameters. See Section for details of Default Mode : Normal Mode Normal Mode consists of one process: 1. The device accepts new commands to control the relays. Electro Industries/GaugeTech Doc # E

127 10.7: Digital Solid State Pulse Output (KYZ) Module Digital Solid State Pulse Output (KYZ) Module Specifications Model Number Communication Power Requirement Operating Temperature Voltage Rating Commands Accepted Memory 4PO1 RS485, Modbus RTU Programmable Baud Rates: 4800, 9600, 19200, V dc at ma; Nexus 1262/1272 Unit's Power Supply DOES NOT Support Output Modules (-20 to 79) C / (-4 to +158) F Up to 300V dc Read and Write with at least 4 registers of data per command 256 byte I 2 C EEPROM for storage of Programmable Settings and Nonvolatile Memory Modbus Address: 160 Factory Settings Baud Rate: Transmit Delay Time: 0 Default Settings (Reset Button) Modbus Address: 247 Baud Rate: Transmit Delay Time: 20 csec : Overview The KYZ Pulse Output Modules have 4 KYZ Pulse Outputs and accept Read and Write Commands with at least 4 registers of data per command. Digital Solid State Pulse Output (KYZ) Modules are user programmed to reflect VAR-hours, WATT-hours, or VA-hours. See the Modbus Communicating Output Modules User Manual for details on programming the module. The Nexus 1262/1272 unit does not supply power for the KYZ Pulse Output modules. A power source is required. See Section 10.2 for power and communication details. The Modbus Map for the KYZ Pulse Output Module (and operating details) can be found in the Modbus Communicating Output Modules Manual. NC = Normally Closed; NO = Normally Open; C = Common. Electro Industries/GaugeTech Doc # E

128 10.7.2: Communication Maximum registers per request, read or write, is 4 registers.orm The device will operate with the following Default Mode Parameters. See Section for details. Address 247 (F7H) Baud Rate Baud Transmit Delay Time 20 csec : Normal Mode Energy readings are given to the device frequently. The device generates a pulse at each channel after a certain energy increase. Normal Operation consists of three processes: 1. The first process accepts writes to registers Writes can be up to four registers long and should end on the fourth register of a group (register 04100, or registers or registers ). These writes can be interpreted as two-byte, four-byte, six-byte or eight-byte energy readings. The reception of the first value for a given channel provides the initial value for that channel. Subsequent writes will increment the Residual for that channel by the difference of the old value and the new value. The previous value is then replaced with the new value. Attempting to write a value greater than the programmed Rollover Value for a given channel is completely ignored and no registers are modified. If the difference is greater than half of the programmed Rollover Value for a given channel, the write does not increment the Residual but does update the Last Value. Overflow of the Residual is not prevented. 2. The second process occurs in the main loop and attempts to decrement the Residual by the Programmed Energy/Pulse Value. If the Residual is greater than the Programmed Energy/Pulse Value and the Pending Pulses Value for that channel is not maxed, then Residual is decremented appropriately and the Pending Pulses is incremented by two, signifying two more transitions and one more pulse. 3. The third process runs from a timer which counts off pulse widths from the Programmable Minimum Pulse Width Values. If there are Pulses Pending for a channel and the delay has passed, then the Pulses Pending is decremented for that channel and the Output Relay is toggled. Operation Indicator (0000H = OK, 1000H = Problem): Bit 1: 1 = EEPROM Failure Bit 2: 1 = Checksum for Communications Settings bad Bit 3: 1 = Checksum for Programmable Settings bad Bit 4: 1 = 1 or mor Communications Settings are invalid Bit 5: 1 = 1 or more Programmable Settings are invalid Bit 6: 1 = 1 or more Programmable Settings have been modified Bit 7: 1 = Forced Default by Reset Value Bit 15: 1 = Normal Operation of the device is disabled Electro Industries/GaugeTech Doc # E

129 10.8: Specifications The following multiple analog or digital Output modules mount externally to the Nexus Socket meter. The Nexus 1262 and 1272 Units do not supply power for Output modules. Use an additional power supply, such as PSIO, to provide Output capability. See Chapter 6 for mounting diagrams. Analog Transducer Signal Outputs (Up to two modules can be used with the meter.) 1mAON4: 4 Analog Outputs, scalable, bidirectional. 1mAON8: 8 Analog Outputs, scalable, bidirectional. 20mAON4: 4 Analog Outputs, scalable. 20mAON8: 8 Analog Outputs, scalable. Digital Dry Contact Relay Outputs (Multiple modules can be used.) 4RO1: 4 Relay Outputs 10 Amps, 125V ac, 30V dc, Form C. Digital Solid State Pulse Outputs (Multiple modules can be used.) 4PO1: 4 Solid State Pulse Outputs, Form A KYZ pulses. Other Output Module Accessories PSIO: External Power Supply which is necessary if you are connecting Output modules to a Nexus 1262 or 1272 Socket Meter. MBIO: Bracket for surface-mounting Output modules to any enclosure. Electro Industries/GaugeTech Doc # E

130 Electro Industries/GaugeTech Doc # E

131 Chapter 11 Electrical Installation for Nexus 1262/1272 Meter 11.1: Wiring Diagrams Choose from three supported meter forms based on the rated voltage and hookup required for your application. Corresponding wiring diagrams appear on the following pages. If the connection diagram you need is not listed, contact EIG for a custom connection diagram. NOTE: Form 45S replaces Form 5S and may also be used in 4-wire circuits. Nexus Meter Forms and Associated Application Diagrams Form 9S 36S 45S 9S in S/A Description Wye, no PTs, 3 CTs Wye, 3 PTs, 3 CTs 4-Wire Delta, no PTs, 3 CTs 4-Wire Delta, 3 PTs, 3 CTs 4-Wire Delta, no PTs, 2 CTs 4-Wire Delta, 2 PTs, 2 CTs 3-Wire Delta, no PTs, 2 CTs 3-Wire Delta, 2 PTs, 2 CTs 2.5 EL Wye, no PTs, 3 CTs 2.5 EL Wye, 2 PTs, 3 CTs Wye, no PTs, 3 CTs Wye, 2 PTs, 3 CTs 3-Wire Delta, no PTs, 2 CTs 3-Wire Delta, 2 PTs, 2 CTs 4-Wire Delta, no PTs, 2 CTs 4-Wire Delta, 2 PTs, 2 CTs Form 9S mounted in S/A Adapter (showing connectors) Fig # Table 11.1: Nexus 1262/1272 Meter Forms Electro Industries/GaugeTech Doc # E

132 GROUNDING: AUXILIARY POWER: Industrial meters are typically grounded at the service entrance (not the meter) per NEC (1999) Section (5) and Meters may be externally powered using a (120 to 230)V AC or (125 to 400)V DC power supply. NOTE: For forms not on the above list, contact the factory and let us know your requirements. Electro Industries/GaugeTech Doc # E

133 Fig 11.1: Form 9S Wye, no PTs, 3 CTs Electro Industries/GaugeTech Doc # E

134 Fig 11.2: Form 9S Wye, 3 PTs, 3 CTs Electro Industries/GaugeTech Doc # E

135 Fig 11.3: Form 9S 4-Wire Delta, no PTs, 3 CTs Electro Industries/GaugeTech Doc # E

136 Fig 11.4: Form 9S 4-Wire Delta, 3 PTs, 3 CTs Electro Industries/GaugeTech Doc # E

137 Fig 11.5: Form 9S 4-Wire Delta, no PTs, 2 CTs (Neutral is not shown for simplicity) Electro Industries/GaugeTech Doc # E

138 Fig 11.6: Form 9S 4-Wire Delta, 2 PTs, 2 CTs (Neutral is not shown for simplicity) Electro Industries/GaugeTech Doc # E

139 Fig 11.7: Form 9S 3-Wire Delta, no PTs, 2 CTs Electro Industries/GaugeTech Doc # E

140 Fig 11.8: Form 9S 3-Wire Delta, 2 PTs, 2 CTs Electro Industries/GaugeTech Doc # E

141 Fig 11.9: Form 36S 2.5 Element Wye, no PTs, 3 CTs Electro Industries/GaugeTech Doc # E

142 Fig 11.10: Form 36S 2.5 Element Wye, 2 PTs, 3 CTs Electro Industries/GaugeTech Doc # E

143 Fig 11.11: Form 45S Wye, no PTs, 3 CTs Electro Industries/GaugeTech Doc # E

144 Fig 11.12: Form 45S Wye, 2 PTs, 3 CTs Electro Industries/GaugeTech Doc #: E

145 Fig 11.13: Form 45S 3-Wire Delta, no PTs, 2 CTs Electro Industries/GaugeTech Doc # E

146 Fig 11.14: Form 45S 3-Wire Delta, 2 PTs, 2 CTs Electro Industries/GaugeTech Doc # E

147 Fig 11.15: Form 45S 4-Wire Delta, no PTs, 2 CTs (Neutral is not shown for simplicity) Electro Industries/GaugeTech Doc # E

148 Fig 11.16: Form 45S 4-Wire Delta, 2 PTs, 2 CTs (Neutral is not shown for simplicity) Electro Industries/GaugeTech Doc # E

149 11.2: Nexus 1262/1272 Meter Mounted in S/A Adapter Any of the 9S Forms can be mounted in an S/A Adapter, such as the one shown below. The socket meter is pushed into the S/A Adapter until the meter snaps into place. The blades on the back of the socket meter make the proper connection. See section 11.1 for the 9S Form wiring diagrams. Fig 11.17: Form 9S Mounted in an S/A Adapter (Front Terminal Cover Removed) Electro Industries/GaugeTech Doc # E

150 Electro Industries/GaugeTech Doc # E

151 Chapter 12 Nexus 1262/1272 Switchboard Meter 12.1: Introduction Fig. 12.1: 1262/1272 Switchboard Meter, Front View This chapter gives you a brief overview of the Nexus 1262/1272 Switchboard Option. The Nexus Switchboard Meter gives you all the features of the Nexus Socket Meter in a compact case. Easy installation or disconnection is the primary benefit of choosing this option. The Switchboard System lets you install or rack out the meter in two easy steps. Minimal manual wiring is required to connect or disconnect the meter. The Nexus Switchboard Meter works just like the Nexus 1262/1272 Socket Meter. For a complete summary of all the features, see Chapter 2 of this manual. For details on any of the many features, see the Table of Contents for the desired feature. The differences are few: The labels on the face and the shroud of the meter will be slightly different, depending on options selected (see Section 12.2 for label detail); the wiring Forms are 9Z and 36Z and the wiring is different (see Section 12.5); dimensions are obviously different (see Section 12.3); installation is different and easy (see Section 12.4). Caution: The Power Supply Input on 1262/1272 units is configured differently. Please check wiring carefully. Electro Industries/GaugeTech Doc # E

152 12.2: Labels The labels on the Switchboard meter will be the similar to Nexus 1262/1272 Socket Meter. Forms are 9Z and 36Z and there may be some additional items, depending on options selected. See Chapter 3 of this manual for a description of the components on the front and shroud labels. Fig. 12.2: Front view of the 1272 Switchboard Meter Fig. 12.3: Example Options Label for the 1262 or 1272 Switchboard Meter Electro Industries/GaugeTech Doc # E

153 12.3: Specifications and Dimensions The Nexus 1262/1272 Switchboard Meter specifications are the same as for the Nexus 1262/1272 Socket Meter, except for the following: The dimensions are detailed below. The specifications are detailed in Chapter 2 of this manual. The Nexus Switchboard Meter is essentially the socket meter in an optional oblong case. The dimensions are detailed in Figures 12.1 (Front View), 12.4 (Back View) and 12.5 (Side View). Electro Industries/GaugeTech Fig. 12.4: Switchboard Meter, Back View Caution: Power In on new units is configured differently. Please check wiring carefully. Electro Industries/GaugeTech Doc # E

154 Fig. 12.5: Switchboard Meter, Side View Electro Industries/GaugeTech Doc # E

155 Fig. 12.6: Switchboard Meter Cutout with Tolerance NOTE: When the Switchboard cases are built, they are not exact. They are welded together and have slight variations. For that reason we add Tolerance to the above Cutout Diagram (Fig. 12.6). The dimensions shown are the exact measurements of boxes we have on hand that have been measured. We added 1/16 ( mm) for the cutout. Please check DRILL HOLES for the mounting screw you are using. Check to see that the mounting screw fits the box tightly enough to hold the box in place. You can use a washer for a slightly smaller mounting screw. Electro Industries/GaugeTech Doc # E

156 12.4: Installation The Nexus Switchboard Meter provides two-step installation or disconnection. 1. Insert the case into a prepared mounting hole for the switchboard case. Secure with mounting screws. Before installing the meter, check the battery connections (sections 6.2, 5.4.4). 2. Slide the meter into the case and secure by sliding the chassis levers until they snap into place. Connectors for the following are located on the back of the meter. The connectors will automatically plug into the available connectors on the mounting board (see figure below). Pulse Outputs - Four Channels Status Inputs Phone Line/Network Power In COM4, COM1 IRIG-B Modem Gateway RS485 Position the case front against the four screw holes. Secure the front of the case by turning the four built-in screws in each of the corners. Built-in Screws Fig. 12.7: Front Case showing Built-In Screws Electro Industries/GaugeTech Doc # E

157 12.5: Wiring Diagrams The wiring of the Nexus 1262/1272 Switchboard Meter is similar to that of the Nexus Socket Meter. 1262/1272 Switchboard Meter Forms and Associated Application Diagrams Form 9Z 36Z Description Figure # Wye, no PTs, 3 CTs 12.9 Wye, 3 PTs, 3 CTs Wire Delta, no PTs, 3 CTs Wire Delta, 3 PTs, 3 CTs Wire Delta, no PTs, 2 CTs Wire Delta, 2 PTs, 2 CTs Wire Delta, no PTs, 2 CTs Wire Delta, 2 PTs, 2 CTs EL Wye, no PTs, 3 CTs EL Wye, 2 PTs, 3 CTs Table 12.1: Switchboard Meter Configurations The meter snaps into place and is secured with levers and screws. All input and output connections are made automatically as the meter is installed. Note the view of the meter case in Fig Wiring options are detailed in Figures 12.8 through NOTE: For special requirements, contact our service department. All wiring should be done by a licensed professional. Actual installation procedures, materials, equipment and connections must conform to applicable codes and standards. Fig. 12.8: Back Angle View of Switchboard Meter Electro Industries/GaugeTech Doc # E

158 Caution: Power Supply Input on new units is configured differently. Please check wiring carefully. Fig. 12.9: 9Z Transformer Rated Wye, no PTs, 3 CTs. Electro Industries/GaugeTech Doc # E

159 Caution: Power Supply Input on new units is configured differently. Please check wiring carefully. Fig : 9Z Transformer Rated Wye, 3 PTs, 3 CTs. Electro Industries/GaugeTech Doc # E

160 Caution: Power Supply Input on new units is configured differently. Please check wiring carefully. Fig : 9Z Transformer Rated 4-Wire Delta, no PTs, 3 CTs. Electro Industries/GaugeTech Doc # E

161 Caution: Power Supply Input on new units is configured differently. Please check wiring carefully. Fig : 9Z Transformer Rated 4-Wire Delta, 3 PTs, 3 CTs. Electro Industries/GaugeTech Doc # E

162 Caution: Power Supply Input on new units is configured differently. Please check wiring carefully. Fig : 9Z Transformer Rated 4-Wire Delta, no PTs, 2 CTs. Electro Industries/GaugeTech Doc # E

163 Caution: Power Supply Input on new units is configured differently. Please check wiring carefully. Fig : 9Z Transformer Rated 4-Wire Delta, 2 PTs, 2 CTs. Electro Industries/GaugeTech Doc # E

164 Caution: Power Supply Input on new units is configured differently. Please check wiring carefully. Fig : 9Z Transformer Rated 3-Wire Delta, no PTs, 2 CTs. Electro Industries/GaugeTech Doc # E

165 Caution: Power Supply Input on new units is configured differently. Please check wiring carefully. Fig : 9Z Transformer Rated 3-Wire Delta, 2 PTs, 2 CTs. Electro Industries/GaugeTech Doc # E

166 Caution: Power Supply Input on new units is configured differently. Please check wiring carefully. Fig : 36Z 2.5 Element Wye, no PTs, 3 CTs. Electro Industries/GaugeTech Doc # E

167 Caution: Power Supply Input on new units is configured differently. Please check wiring carefully. Fig : 36Z 2.5 Element Wye, 2 PTs, 3 CTs. Electro Industries/GaugeTech Doc # E

168 Electro Industries/GaugeTech Doc # E

169 Chapter 13 Nexus Meter Calculations 13.1: Measurements and Calculations The Nexus 1262/1272 meter measures many different power parameters. The following is a list of the formulas used to conduct calculations with samples for Wye and Delta services. Samples for Wye: v an, v bn, v cn, i a, i b, i c, i n Samples for Delta: v ab, v bc, v ca, i a, i b, i c Root Mean Square (RMS) of Phase to Neutral Voltages: n = number of samples. For Wye: x = an, bn, cn V RMS X = n t= 1 v n 2 xt () Root Mean Square (RMS) of Currents: n = number of samples For Wye: x = a, b, c, n For Delta: x = a, b, c I RMS X = n 2 ixt () t= 1 n Root Mean Square (RMS) of Phase to Phase Voltages: n = number of samples For Wye: x,y = an, bn or bn, cn or cn, an I RMS XY = n ( v ) 2 xt () vyt () t= 1 n Electro Industries/GaugeTech Doc # E

170 For Delta: xy = ab, bc, ca V RMS XY = n t= 1 v 2 xy() t n Power (Watts) per phase: For Wye: x = a, b, c n vxn() t ix () t t 1 W = = x n Apparent Power (VA) per phase: For Wye: X = A, B, C VA = X V RMS XN I RMS X Reactive Power (VAR) per phase: For Wye: X = A, B, C VAR = VA W 2 2 X X X Q per phase: For Wye: X = A, B, C Q X = 3 VAR 2 X + W X For Delta: unused Electro Industries/GaugeTech Doc # E

171 Power (Watts) Total: For Wye: W = T W + A W + B W C For Delta: n vabt () iat () vbct () ict () t 1 W = = T ( ) n Reactive Power (VAR) Total: For Wye: VAR = T VAR + A VAR + B VAR C For Delta: 2 ( RMS RMS ) ab() t a () t t= 1 = T AB A n VAR V I 2 ( RMS RMS ) V BC + n v i n vbc() t i ct () t= 1 I C n 2 2 Apparent Power (VA) Total: For Wye: VA = T VA + A VA + B VA C For Delta: VA = W + VAR 2 2 T T T Electro Industries/GaugeTech Doc # E

172 Total Q: For Wye: Q = Q + Q + Q T A B C For Delta: Q = T 2 + W 3VAR T T Total Energy: X = W T, VAR T, VA T, Q T Xh = X 3600 Power Factor (PF): For Wye: X = A, B, C, T For Delta: X = T PF X = W VA X X Total Average Power Factor: X = Quadrants 1 & 4 (positive Wh), Quadrants 2 & 3 (negative Wh) PF Total _ Ave X Wh = VAh X X Electro Industries/GaugeTech Doc # E

173 Phase Angles: X = A, B, C X = cos 1 ( PF X) % Total Harmonic Distortion (%THD): For Wye: X = V AN, V BN, V CN, I A, I B, I C For Delta: X = I A, I B, I C, V AB, V BC, V CA THD X = ( ) h= 2 RMS RMS X 1 X h K Factor: X = I A, I B, I C KFactor X = ( i X ) h= 1 ( X ) h= 1 hrms RMS h h Voltage Imbalance: Imb V = ( v + ) 2 an v + bn vcn n n + + RMS RMS RMS V V V AN BN CN Current Imbalance: Imb I = RMS ICalcN RMS + RMS + RMS I I I A B C Electro Industries/GaugeTech Doc # E

174 13.2: Demand Integrators Power utilities take into account both energy consumption and peak demand when billing customers. Peak demand, expressed in kilowatts (kw), is the highest level of demand recorded during a set period of time, called the interval. The Nexus 1262/1272 meter supports the following most popular conventions for averaging demand and peak demand: Thermal Demand, Block Window Demand, Rolling Window Demand and Predictive Window Demand. You may program and access all conventions concurrently with the Communicator EXT software (see the Communicator EXT User Manual). Thermal Demand: Traditional analog watt-hour (WH) meters use heat-sensitive elements to measure temperature rises produced by an increase in current flowing through the meter. A pointer moves in proportion to the temperature change, providing a record of demand. The pointer remains at peak level until a subsequent increase in demand moves it again, or until it is manually reset. The Nexus meter mimics traditional meters to provide Thermal Demand readings. Each second, as a new power level is computed, a recurrence relation formula is applied. This formula recomputes the thermal demand by averaging a small portion of the new power value with a large portion of the previous thermal demand value. The proportioning of new to previous is programmable, set by an averaging interval. The averaging interval represents a 90% change in thermal demand to a step change in power. Block (Fixed) Window Demand: Fixed Window Demand produces an average (arithmetic mean) of power readings over a programmed interval. Example: A typical setting of 15 minutes produces an average value every 15 minutes (at 12:00, 12:15, 12:30, etc.) for power readings over the previous fifteen minute interval (11:45-12:00, 12:00-12:15, 12:15-12:30, etc.) Rolling (Sliding) Window Demand: Rolling Window Demand functions like multiple, overlapping Block Window Demands. The programmable settings provided are the number and length of demand subintervals. Every subinterval, an average (arithmetic mean) of power readings over the subinterval is internally calculated. This new subinterval average is then averaged (arithmetic mean) with as many previous subinterval averages as programmed, to produce the Rolling Window Demand. Example: With settings of 3 five minute subintervals, subinterval averages are computed every 5 minutes (12:00, 12:05, 12:10, 12:15. etc.) for power readings over the previous five minute interval (11:55-12:00, 12:00-12:05, 12:05-12:10, 12:10-12:15, etc.). Further, every 5 minutes, the subinterval averages are averaged in groups of 3 (12:00, 12:05, 12:10; 12:05, 12:10, 12:15. etc.) to produce a fifteen (5*3) minute average every 5 minutes (rolling (sliding) every 5 minutes) (11:55-12:10, 12:-12:15, etc.). Predictive Window Demand: Predictive Window Demand expands on the above Rolling Window Demand. Rolling Window Demand waits until the end of a subinterval to update the demand. Predictive Window Demand uses the average of the previously completed subinterval, weighted by a programmable factor, to guess at the average of the upcoming subinteval During the next subinterval, as actual power readings occur, the value for the subinterval consists of the portion actually mesured plus a predicted guess, prorated to the subinterval time remaining. Electro Industries/GaugeTech Doc # E

175 Example: Using the previous settings of 3 five minute intervals, and a new setting of 120% prediction factor, the working of the Predictive Window Demand could be described as follows: At 12:10, we have the average of the subintervals from 11:55-12:00, 12:00-12:05 and 12:05-12:10. In five minutes, we will have an average of the subintervals 12:00-12:05 and 12:05-12:10 (which we know) and 12:10-12:15, which we do not yet know. As a guess, we will use the last subinterval (12:05-12:10), as an approximation for the next subinterval (12:10-12:15). As a further refinement, we will assume that the next subinterval might have a higher average (120%) than the last subinterval. As we progress into the subinterval, (for example, up to 12:11), the Predictive Window Demand will be the average of the first two subintervals (12:00-12:05, 12:05-12:10), the actual values of the current subinterval (12:10-12:11) and the prediction for the remainder of the subinterval, 4/5 of 120% of the 12:05-12:10 subinterval. # of Subintervals = n Subinterval Length = Len Partial Subinterval Length = Cnt Prediction Factor = Pct Sub n... Sub 1 Sub 0 Partial Predict Len Len Len Cnt Len Sub = Len 1 i= 0 Value Len i Partial = Cnt 1 i= 0 Value Cnt i n 2 Valuei i= 0 Len Cnt Partial xpct n Len n 2 Subi i= 0 Sub0 Sub n 1 Len Cnt + + x xpct n 1 2 x( n 1) Len Electro Industries/GaugeTech Doc # E

176 Electro Industries/GaugeTech Doc #: E

177 Chapter 14 EN50160 Flicker 14.1: Overview Flicker is the sensation that is experienced by the human visual system when it is subjected to changes occurring in the illumination intensity of light sources. The primary effects of flicker are headaches, irritability and sometimes epilepsy. IEC and former IEC 868 describe the methods used to determine flicker severity. This phenomenon is strictly related to the sensitivity and the reaction of individuals. It can only be studied on a statistical basis by setting up suitable experiments among people. 14.2: Theory of Operation Flicker can be caused by voltage variations which are caused by variable loads, such as arc furnaces, laser printers and microwave ovens. In order to model the eye brain change, which is a complex physiological process, the signal from the power network has to be processed while conforming with Figure 14.1 below. Block 1 consists of scaling circuitry and an automatic gain control function that normalizes input voltages to Blocks 2, 3 and 4. For the specified 50 Hz operation, the voltage standard is 230 V RMS. Block 2 recovers the voltage fluctuation by squaring the input voltage scaled to the reference level. This simulates the behavior of a lamp. Block 3 is composed of a cascade of two filters and a measuring range selector. In this implementation, a log classifier covers the full scale in use so the gain selection is automatic and not shown here. The first filter eliminates the DC component and the double mains frequency components of the demodulated output. The configuration consists of a.05 Hz Low High Pass filter and a 6 Pole Butterworth Low Pass filter located at 35 Hz. The second filter is a weighting filter that simulates the response of the human visual system to sinusoidal voltage fluctuations of a coiled filament, gas-filled lamp (60 W V). The filter implementation of this function is as specified in IEC Block 4 is composed of a squaring multiplier and a Low Pass filter. The Human Flicker Sensation via lamp, eye and brain is simulated by the combined non-linear response of Blocks 2, 3 and 4. Block 5 performs an online statistical cumulative probability analysis of the flicker level. Block 5 allows direct calculation of the evaluation parameters Pst and Plt. Flicker is computed using the three phase-to-neutral voltages in WYE configurations and the three phase-to-phase voltages when in DELTA. Evaluation occurs in the following forms: Instantaneous, Short Term or Long Term. Each form is detailed below: Electro Industries/GaugeTech Doc # E

178 Instantaneous Flicker Evaluation An output of 1.00 from Block 4 corresponds to the Reference Human Flicker Perceptibility Threshold for 50% of the population. This value is measured in Perceptibility Units (PU) and is labeled Pinst. This ia a real time value and it is continuously updated. Short Term Flicker Evaluation An output of 1.00 from Block 5 (corresponding to the Pst value) corresponds to the conventional threshold of irritability per IEC In order to evaluate flicker severity, two parameters have been defined: one for the short term called Pst (defined in this section) and one for the long term called Plt (defined in the next section). The standard measurement time for Pst is 10 minutes. Pst is derived from the time at level statistics obtained from the level classifier in Block 5 of the flicker meter. The following formula is used: Pst = P P1 s P3 s P10s P50s Where the percentiles P(0.1), P(1), P(3), P(10), P(50) are the flicker levels exceeded for 0.1, 1, 2, 20 and 50% of the time during the observation period. The suffix S in the formula indicates that the smoothed value should be used. The smoothed values are obtained using the following formulas: P(1s) = (P(.7) + P(1) + P(1.5))/3 P(3s) = (P(2.2) + P(3) + P(4))/3 P(10s) = (P(6) + P(8) + P(10) + P(13) + P(17))/5 P(50s) = (P(30) + P(50) + P(80))/3 The.3-second memory time constant in the flicker meter ensures that P(0.1) cannot change abruptly and no smoothing is needed for this percentile. Long Term Flicker Evaluation The 10-minute period on which the short-term flicker severity is based is suitable for short duty cycle disturbances. For flicker sources with long and variable duty cycles (e.g. arc furnaces) it is necessary to provide criteria for long-term assessment. For this purpose, the long-term Plt is derived from the short-term values over an appropriate period. By definition, this is 12 short-term values of 10 minutes each over a period of 2 hours. The following formula is used: P lt = 3 N i= 1 N P 3 sti Where P sti (i = 1, 2, 3,...) are consecutive readings of the short-term severity P st. Summary Flicker = Changes in the illumination of light sources due to cyclical voltage variations. Pinst = Instantaneous flicker values in Perceptibility Units (PU). Pst = Value based on 10-minute analysis. Plt = Value based on 12 Pst values. Electro Industries/GaugeTech Doc # E

179 Measurement Procedure 1. Original Signal with amplitude variations. 2. Square demodulator. 3. Weighted filter. 4. Low pass filter 1 st order. 5. Statistical computing. Data available Pst, Pst Max, Pst Min values for long term recording Plt, Plt Max, Plt Min values for long term recording Simulation Of Eye Brain Response Block 1 Block 2 Block 3 Block 4 Block 5 Voltage Detector and Gain Control Input Voltage Adaptor Square Law Demodulator High Pass Filter (DC Removal) Low Pass Filter (Carrier Removal Weighting Filter Squaring Multiplier 1st Order Sliding Mean Filter A/D Converter Sampling Rate >50Hz Minimum 64 level Classifier Programming of short and long observation periods Output Interface Output Recording Instantaneous Flicker in Perceptibility Units (Pinst) Output and Data Display Pst Max/Min Pst Plt Max/Min Plt Figure 14.1: Simulation of Eye Brain Response 14.3: Setup Initially the user must set up several parameters to properly configure Flicker. Using Communicator EXT, from the Icon Menu select Edit Device Profile. From the Device Profile, select Power Quality and Alarm Settings, EN50160 Flicker. The following screen will appear: Electro Industries/GaugeTech Doc # E

180 Select a Pst time range from 1 to 10 minutes. The standard measurement period is nominally 10 minutes. Select a Plt time range from 1 to 240 minutes. The standard measurement is nominally 12 Pst periods (120 minutes). Plt time must always be equal to or great than and a multiple of Pst time. This is reflected in the selections available to the user. Select the frequency of operation. 50 Hz is the approved frequency according to Flicker standards. A 60 Hz implementation is available and can be selected. This implementation is the proposed 60 Hz standard that is still in the approval process. Remember the voltage is normalized. For 50 Hz, the normalized voltage is 230 V and for 60 Hz, the normalized voltage is 120 V. Press OK when you are finished. Press Help for more information on this topic. 14.4: Software - User Interface Main screen From the Communicator EXT Icon Menu select Real Time Poll, Flicker. The following screen appears: This section describes the Main Screen functions. The available values (Instantaneous, Short Term, Long Term) will be described below. Electro Industries/GaugeTech Doc # E

181 Time Start/Reset is the time when Flicker was started or reset. A Reset of Flicker causes the Max/Min values to be cleared and restarts the Flicker Pst and Plt timers. A Start of Flicker is also equivalent to a Reset in that the PST and PLT are restarted and the Max/Min Values are cleared. Stop corresponds to the time when Flicker is turned off. Current is the current clock time. Next Pst is the countdown time to when the next Pst value is available. Next Plt is the countdown time to when the next Plt value is available. Status Indicates the current status. Active = On. Stopped = Off. Frequency Base is the current operating frequency selected by the user (50 or 60 Hz). Current is the real time frequency measurement of the applied voltage. Base Voltage is the normalized voltage for the selected frequency (230 V for 50 Hz or 120 V for 60 Hz). Flicker Monitoring Clicking on Stop causes Flicker to stop being processed and freezes all the current values. Stop Time is recorded and clears the current Max/Min Values Clicking on Start starts Flicker processing. Start Time is recorded. Clicking on Reset causes the Max/Min values to be cleared and restarts the Flicker Pst and Plt timers. Click OK to exit the Flicker screen. Click Help for more information on this topic. Instantaneous Readings Refer to the Instantaneous section of the Main screen above. If you are on the Short or Long Term screens, click on the Instantaneous tab to display the Instantaneous screen. The PU values, Pinst for Voltage Inputs Va, Vb and Vc are displayed here and are continuously updated. The corresponding Current Voltage values for each channel are displayed for reference. Electro Industries/GaugeTech Doc # E

182 Short Term Readings Click on the Short Term tab to access the screen containing three groups of Pst readings. Pst Readings Displayed Current Pst values for Va, Vb and Vc and the time of computation. Current Pst Max values for Va, Vb and Vc since the last reset and the time of the last reset. Current Pst Min values for Va, Vb and Vc since the last reset and the time of the last reset. The following screen is displayed: Long Term Readings Click on the Long Term tab to access the Plt readings. The screen below displays three groups of Plt values. Plt Readings Displayed Current Plt values for Va, Vb and Vc and the time of computation. Current Plt Max values for Va, Vb and Vc since the last reset and the time of the last reset. Current Plt Min values for Va, Vb and Vc since the last reset and the time of the last reset. Electro Industries/GaugeTech Doc # E

183 14.5: Logging The Nexus meter is capable of logging Flicker values in an independent log. When Flicker is on, entries are made into the log in accordance with the times that associated values occur. Pst, Pst Max, Pst Min, Plt, Plt Max, Plt Min, Start/Reset and Stop times are all recorded. All values can be downloaded to the Log Viewer where they are available for graphing or export to another program, such as Excel. All Flicker values are predefined and cannot be changed. 14.6: Polling The Pinst, Pst, Pst Max, Pst Min, Plt, Plt Max, Plt Min values are all capable of being polled through the Communications Port. Refer to the Nexus meter Modbus and DNP Mappings for register assignments and data definitions. 14.7: Log Viewer From the Communicator EXT Log Viewer screen, using the menus at the top of the Log Viewer screen, select a meter, time ranges and values to access. Select Flicker. The values and the associated time stamps (when the values occurred) are displayed in a grid box. Use the buttons at the bottom of the screen to create a graph or export the data to another program. Max and Min values are only displayed; they cannot be graphed. But, Max and Min values are available for export. Graphed values include Pst and Plt Va, Vb and Vc. Displayed values include Pst and Plt Max and Min for Va, Vb and Vc. Electro Industries/GaugeTech Doc # E

184 14.8: Performance Notes Pst and Plt average time are synchronized to the clock (e.g. for a 10 minute average, the times will occur at 0, 10, 20, etc.). The actual time of the first average can be less than the selected period to allow for initial clock synchronization. If the wrong frequency is chosen (e.g. 50Hz selection for a system operating at 60Hz), Flicker will still operate but the values computed will not be valid. Select carefully. User settings are stored. If Flicker is on and power is removed from the meter, Flicker will still be on when power returns. This can cause data gaps in the logged data. The Max and Min values are stored and are not lost if the unit is powered down. Flicker meets the requirements of IEC and former IEC 868. Refer to those specifications for more details, if needed. Operation is at 230V for 50Hz and 120V for 60Hz as per specification. If the input voltage is different, the system will normalize it to 230V or 120V for computational purposes. Electro Industries/GaugeTech Doc # E

185 Appendix A Transformer Loss Compensation Excel Spreadsheet with Examples A.1: Calculating Values Transformer Loss Compensation is discussed in Chapter 8 of this manual. Values for three element installations can be calculated in two ways: Click the TLC Calculator button on the Transformer Loss screen of the Nexus meter's Device Profile. The TLC Calculator button activates an Excel Spreadsheet, ONLY if you have MS Excel installed on your computer. A copy of the Excel Spreadsheet is offered on the following pages with example numbers. 1. Enter the required data into the Excel Spreadsheet. The Excel program will calculate the values needed for the Transformer Loss screen of the Device Profile. 2. Enter the values into the Device Profile. Use the worksheet found in Chapter 8, Three Element Loss Compensation Worksheet to calculate the values by hand. Notes under each section will assist you. 1. Enter values based on the tranformer manufacturer s test report. The worksheet is progressive and notes under each section will guide you to the next section. 2. Enter the values into the Device Profile. A.2: Excel Spreadsheet with Example Numbers If you have MS Excel installed in your computer, use the TLC Calculator button on the Transformer Loss screen of the Device Profile. The copy of the Spreadsheet with Example Numbers found on the following pages will assist you. Important! Refer to Appendix B of the Communicator EXT User Manual for additional instructions and information on the Transformer Line Loss application. Electro Industries/GaugeTech Doc # E A-1

186 Electro Industries/GaugeTech Doc # E A-2

187 Electro Industries/GaugeTech Doc # E A-3

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189 Electro Industries/GaugeTech Doc # E A-5