TECHNICAL DESCRIPTION WM1 6, WM1M6

Transcription

1 TECHNICAL DESCRIPTION GB D SINGLE PHASE ELECTRICAL ENERGY METER WM1 6, WM1M6 Priimek Datum Naziv Projekt. KORDEŽ Izdelal NOČ WM1 6, WM1M6 Pripadnost Merilo List Izdaja J K Identifikacijska številka WM1 6 L1 17 V3.00 GB D

2 Table of Contents 1 PICTURE 2 2 OVERWIEV 3 3 APPLICATION 3 4 LAYOUT AND MODE OF OPERATION 4 5 SOFTWARE DESCRIPTION 5 6 INSTALLATION AND CONNECTION 13 7 TECHNICAL DATA: Terminals Measuring input Accuracy LCD LED Pulse output (option) Serial communication (option) Optical communication Tariff input (option) Ambient conditions and Safety: 15 8 DIMENSIONAL DRAWINGS 16 9 DATA FOR ORDERING 17 1 PICTURE Page 2 to 17

3 2 OVERWIEV Single phase direct connection up to 65 A (Imax) MID approval (WM1M6) Class 1 for active energy according to EN and B according to EN Class 2 for reactive energy according to EN Reference frequency 50 and 60 Hz Pulse output according to EN A&B (option) Serial RS485 communication (option) Tariff input (option) Display LCD 7+1 digit (100 Wh resolution) Multifunctional front LED 2 DIN rail width mounting according to EN Sealable terminal cover External bistable switch control (option) 3 APPLICATION The meters WM1 6 and WM1M6 are intended for energy measurements in single phase electrical power network and can be used in residential, industrial and utility applications. Meters measure energy directly in 2 wire networks according to the principle of fast sampling of voltage and current signals. A built in microprocessor calculates energy and other electrical quantities from the measured signals. It also controls LCD, LED and installed modules. Housing is provided with terminals protection covers, which can be sealed up against non authorised access. They are built to be fastened to EN standard guides. Meters have built in optical (IR) communication port on the side as a standard. Special WM USB adapter (size 1 DIN module) can easily be attached to it. It can be used for direct communication with PC to change settings of devices without RS485 communication. Optional the meters can be equipped with a RS485 serial communication with the MODBUS protocol, which enables data transmission and thus connection of the measuring places into the network for the control and management with energy. RS485 serial communication can be used together with optical (IR) communication in order to control a bistable swhitch Iskra BICOM. They can also be equipped with tariff input (option). A built in pulse output (option) is designed for sending data to the devices for checking and monitoring consumed energy. Picture 1: Meter parts Page 3 to 17

4 4 LAYOUT AND MODE OF OPERATION Picture 2: Block diagram The meter is supplied from the measuring system using the capacitor power supply (1). For current input the shunt resistor is applied (2).Voltage is measured by the resistor voltage divider (3). A method for sampling voltages and currents with an A/D converter is used. For signal processing the dedicated measuring microcontroller is used SoC (System on a Chip) (4). Amplifiers for current signal and A/D converters are integrated in the SoC. Basic meter data, parameters and calibration constants are stored in the EEPROM (5). There are no adjustable elements (potentiometers) in the meter, which assures a better long term stability. SoC drives directly also the LCD (6) for displaying of 4 energy registers and actual values of other electrical parameters (voltage, current, frequency, active, reactive and apparent power and power factor). One (optional) S0 output (11) can be built into the meter. A number of pulses depend on consumed energy. LED diode (8) is used for indication of no load condition and test output proportional to measured active energy. IR communication (7) using MODBUS protocol is equipped on each meter. It can be used for setting and testing the meter using WM USB adapter. Galvanic separated communication (9, 10) RS485 (optional) also enables setting the meter, data readout in the network and tariff setting. Tariff can also be set via tariff input (12) (option). Page 4 to 17

5 5 SOFTWARE DESCRIPTION System on a Chip (SoC) microcontroller is used which performs measuring function, controlling and monitoring of all other hardware. Firmware is installed on a 32 Kb flash. 3 KB RAM is used to store variables and parameters for communication. Also RAM is used as a temporary storage for software update to the FLASH. Memory map is as shown below: Address (hex) FFF Memory Technology Flash Memory Memory Type Non volatile Typical Usage Common code area for the program and nonvolatile data. Wait States (at 5Mhz) Memory Size 0 32KB FF Static RAM Volatile CE data KB FF Static RAM Volatile MPU data KB BFF Static RAM Volatile Table 1: Memory Map Miscellaneous I/O RAM (configuration RAM) KB END NOT OK START BROWNOUT MODE OK INITIALIZATION: READ EEPROM, CRC CALCULATION AND CHECK, START TIMERS, CONFIGURE INTERRUPTS, READ METERS, ENABLE COMMUNICATION EEPROM READ MEASUREMENT: UPDATE METERS, CALCULATE VOLTAGE, CURRENT AND POWER, SEND PULSES, UPDATE LCD, REFRESH LED IF NEEDED, CRC PARAMETERS CHECK SAVE REGISTERS YES LOW SUPPLY NO COMMUNICATION: READ REGISTERS, CHANGE PARAMETERS (MODBUS) Picture 3: FW block diagram Page 5 to 17

6 Analogue inputs capture voltage, current and power supply voltage. Monitoring power supply supports storing of energy registers to EEPROM. Supported protocol is MODBUS. MODBUS table containing all the codes is present for read/write and read only registers. See Table 2: MODBUS register map UART0 in microcontroller communicate via isolated RS485 driver to network if a 485 board is present. There are 5 different baud rates possible for RS485 communication. o 1200 bits/s o 2400 bits/s o 4800 bits/s o 9600 bits/s o bits/s UART1 in microcontroller communicate via isolated Infrared driver to network. IR communication is provided by default and is always set to a baud rate of bits/s. Installed EEPROM is used to store settings and registers. Watchdog is present. If program fails it is used to reset the meter. Metering functions are done with compute engine (CE). Each 250 ms, firmware is transforming the values of these registers to human readable values. There are four different energy counters, which can be configured each to measure one of seven different types of energy. For MID meters, this energy counters are configured only in production. For Non MID counters they can be also reconfigured during use. These are: o o o o o o o Total Absolute Active Energy (kwh) Total Absolute Reactive Energy (kvarh) Total Absolute Apparent Energy (kvah) Import Active Energy (kwh) Export Active Energy (kwh) Import Reactive Energy (kvarh) Export Reactive Energy (kvarh) The energy register is a count of pulses. The number of CE units per pulse is a constant in the meter calibration data. Function add () adds the current interval s power data to a remainder variable. If this variable is larger than one pulse, then the number of pulses is added to the energy register, and remainder variable is decreased by the number of CE units that represent the same amount of energy. LCD contents are updated every 250 ms. Parameters which can be shown are: Energy registers: o Energy counter 1 (mandatory) o Energy counter 2 o Energy counter 3 o Energy counter 4 Actual measured values: o Active Power o Reactive Power o Apparent Power o Power Factor o Voltage o Frequency o Current Page 6 to 17

7 Parameters cycle from 5 to 60 seconds for each parameter. Cycling time and the definition of parameters for LCD scrolling are configured via RS485 or IR communication. Display description: 1. Tariff setting for displayed counter / actual tariff 2. ( ) Energy import / ac ve power import ( ) Energy export / ac ve power export 3. kwh display 4. kvarh display 5. Value 6. Info: kvah display A Currently active counter S Apparent power PF Power factor U Voltage F Frequency I Current 7. W active power var reactive power 8. Inductive / capacitive Energy counter displays (up to 4 counters) are displaying current energy counter settings (tariff, import / export / total, active / reactive / apparent), its value and actual activity (counting (A) / not counting ( )). Other displays are displaying actual value of measured quantity (P W, Q var, S, PF, U, f and I), direction of active energy flow (import / export), reactance (inductive / capacitive) and active tariff (regarding tariff input). Energy registers are displayed with resolution (kwh, kvarh and kvah). The meter can be set to Test measuring mode which displays energy registers with better resolution. The test mode is used for test purposes during type testing and test of meter constant during initial verification. After power off meter automatically goes back to normal operation. Test output is provided as LED with number of impulses proportional to active energy. Pulse constant is 1000 imp/kwh. Optionally the S0 impulse output with the same constant can be used for active energy. Pulse output is defined to be 32 ±2 ms long according EN Energy measurement is blocked for the currents less than 20 ma. The meter measures actual voltage and frequency. Current and power values are set to zero and there is no energy registration. No load condition is indicated with the LED on. If measured voltage is under 170 V, the energy measurements are also blocked and communication is disabled. LCD stops to cycle and displays only value of voltage. Page 7 to 17

8 Software functions: Identification SW version can be read using RS 485 or IR communication. The check sum (CRC) of complete firmware is calculated and displayed during initialization and later it can be read from the MODBUS register. If CRC for code is changed and does not correspond to the initial CRC, an ERROR is detected during startup and ERROR 2 is shown on the LCD. This is checked after every restart of the meter. MID SW is separated from non MID SW MID versions are 2.xx as non MID versions are 1.xx Calibration parameters can only be changed in production. They can not be changed by upgrade or different processes. Special factory software is used to calibrate the parameters for current, voltage, phase angle and linearity. If these parameters were tenaciously or accidentally changed, an error type 1 is detected and ERROR 1 is shown on the LCD. Calibration parameters are checked every 10 minutes for consistency and if error is found, ERROR 1 is immediately shown on LCD. It is possible to upgrade the firmware via factory software protocol. This option is available only for WM1 6 (non MID) type of meter. There is an option for a password to protect the instrument. Password has four levels of protection. Meter has possibility of two level user defined password (4 characters from A to Z). Password Level 1 enables resetting the counters and tariff setting. Password Level 2 enables all available settings and resets. If meter password is forgotten, device serial number should be sent to Iskra Sistemi, d.d. to receive device default password. Software for handling MODBUS protocol is written. Hardware timer is used for calculating the time needed to read and answer a MODBUS protocol message. RTU mode is used. RTU messages start and end with a silent interval of at least 3,5 character times (t1 t2 t3 t4 as shown below). Each message must be transmitted in a continuous stream. If a silent interval of more than1,5 character times occurs before completion of the frame, the device flushes the incomplete message and assumes that the next byte will be the address field of a new message. Cyclic Redundancy Check (CRC) is used. All parameterization is done via communication with MiQen software (version 2.1 or later). WM1M6 (MID) has limited parameterization. Counter settings, tariff setting and counter reset are not enabled. If these settings on WM1M6 (MID) were tenaciously or accidentally changed, an error type 1 is detected and ERROR 1 is shown on the LCD. Settings are checked every 10 minutes for consistency and if error is found, ERROR 1 is immediately shown on LCD. Firmware allows also user defined parameterization software using MODBUS protocol with specified MODBUS registers. The complete set of MODBUS register map: Page 8 to 17

9 Address Contents Data Ind Values / Dependencies Min Max P. Level Lock MID Input Registers WM1M6 READ ONLY INFO Device group T1 4 WM Model Number T_Str16 WM Serial Number T_Str8 WM###### Software Reference T1 100= Hardware Reference T_Str2 A (B,C,D ) Calibration voltage T mv Calibration current T ma Accuracy class T17 100= MiNet Flag T COM1: Communication Type T1 2 RS485 9 Infra red I/O 1 T1 0 No I/O 5 Tariff Input I/O 2 T1 0 No I/O 12 Pulse Output (SO) Calibration Time Stamp T Digital input voltage range T V CheckSum Parameters T CheckSum Firmware T Active Communication Port T1 0 IR 1 COM Modbus Max. Register Read at Once T1 MIN 25 ACTUAL MEASUREMENTS Frequency T U1 T I1 T Active Power Total (Pt) T6 Page 9 to 17

10 Address Contents Data Ind Values / Dependencies Min Max P. Level Lock MID Input Registers WM1M Reactive Power Total (Qt) T Apparent Power Total (St) T Power Factor Total (PFt) T Power Angle Total (atan2(pt,qt)) T IR external relay status T1 0 Off 1 On 250 Comm. Error 255 Not connected ENERGY Error register T1 0 No Error 1 Error Parameter CRC 2 Error Firmware CRC Energy Counter 1 Exponent T Energy Counter 2 Exponent T Energy Counter 3 Exponent T Energy Counter 4 Exponent T Current Active Tariff T Energy Counter 1 T Energy Counter 2 T Energy Counter 3 T Energy Counter 4 T Memory Reference SYSTEM COMMANDS User Password (L1, L2) T_Str4 A Z Password to attempt user access level upgrade Factory Password (FAC) T_Str6 A Z Password to attempt factory access level upgrade Lavel 1 User password T_Str4 A Z Lavel 2 User password T_Str4 A Z 2 Page 10 to 17

11 Address Contents Data Ind Values / Dependencies Min Max P. Level Lock MID Input Registers WM1M Active Acces Level T1 0 Full protection Access up to level 1 user password 2 Access up to level 2 user password 3 Access up to level 2 (backup pass.) 4 Factory access level Operator Command Register T1 1 Save Settings 1 2 Abort Settings 3 Restart Instrument Reset command register 1 T1 Bit 0 Reset counter 1 1 Yes Bit 1 Reset counter 2 Bit 2 Reset counter 3 Bit 3 Reset counter IR external relay command action T1 0 Off On Description T_Str Location T_Str Conection Mode T1 1 1b Single Phase (Fixed) Yes CT connection T1 2 Reverse Energy flow direction (Fixed) Yes LCD cycling period T1 Seconds LCD parameters T1 Bit 0 Counter 1 (Allways) Bit 1 Counter 2 Bit 2 Counter 3 Bit 3 Counter 4 Bit 4 Active Power Total (Pt) Bit 5 Reactive Power Total (Qt) Bit 6 Apparent Power Total (St) Bit 7 Power Factor Total (PFt) Bit 9 Voltage Bit 11 Frequency Page 11 to 17

12 Address Contents Data Ind Values / Dependencies Min Max P. Level Lock MID Input Registers WM1M6 Bit 12 Curent Operation mode 0 Normal mode Test mode External relay operating mode T1 0 Not connected Manual COMMUNICATION Port 1: Device Adress (Modbus) T Port 1: Boud Rate T1 0 Baud rate Baud rate Baud rate Baud rate Baud rate Port 1: Stop Bit T1 0 1 Stop bit Stop bits Port 1: Parity T1 0 No parity Odd parity 2 Even parity Port 1: Data Bits T1 0 8 bits ENERGY Active Tariff T1 0 Tariff input Yes 1..2 Tariff Energy Counter 1 Parameter T1 1 Active Power 1 3* 2 Yes 2 Reactive pover 3 Apparent Power Energy Counter 1 Configuration T1 Bit 0 Quadrant I Enabled 0 63* 2 Yes Bit 1 Quadrant II Enabled * Only Bit 2 Quadrant III Enabled combinations for specified Bit 3 Quadrant IIII Enabled measurement s are possible Page 12 to 17

13 Address Contents Data Ind Values / Dependencies Min Max P. Level Lock MID Input Registers WM1M Energy Counter 1 Tarif Selector T1 Bit 0 Tarif 1 Enabled Yes Bit 1 Tarif 2 Enabled Energy Counter 2 Parameter T1 0 Dissabled 0 3* 2 Yes 1 Active Power 2 Reactive pover 3 Apparent Power Energy Counter 2 Configuration T1 see Energy Counter 1 Configuration 0 63* 2 Yes Energy Counter 2 Tarif Selector T1 see Energy Counter 1 Tarif Selector Yes Energy Counter 3 Parameter T1 see Energy Counter 2 Parameter 0 3* 2 Yes Energy Counter 3 Configuration T1 see Energy Counter 1 Configuration 0 63* 2 Yes Energy Counter 3 Tarif Selector T1 see Energy Counter 1 Tarif Selector Yes Energy Counter 4 Parameter T1 see Energy Counter 2 Parameter 0 3* 2 Yes Energy Counter 4 Configuration T1 see Energy Counter 1 Configuration 0 63* 2 Yes Energy Counter 4 Tarif Selector T1 see Energy Counter 1 Tarif Selector Yes Table 2: MODBUS register map 6 INSTALLATION AND CONNECTION Meter is used for direct connection into the two wire networks. Picture 3: Connection diagram measuring circuit Meter can be equipped with different modules. Pictures below are showing two most equipped combinations. Pulse out. & communication Pulse out. & tariff input Page 13 to 17

14 7 TECHNICAL DATA: Rail mounting according DIN EN Terminals Main inputs Contacts capacity: (25) mm 2 Connection screws: M5 Max torque: 3.5 Nm (PZ2) Optional modules Contact capacity: (2.5) mm 2 Screws: M3 Max torque: 0.6 Nm 7.2 Measuring input Type (connection): single phase (1b) Reference current (Iref): 5 A Maximum current (Imax): 65 A Minimum current (Imin): 0.25 A Transitional current (Itr): 0.5 A Starting current: 20 ma Power consumption at Iref < 0.1 VA Nominal voltage (Un): 230 V (±20 %) Power consumption at Un: < 8 VA Nominal frequency (fn): 50 and 60 Hz Minimum measuring time: 3 impulses or 15 s 7.3 Accuracy Active energy: class 1 EN , class B EN Reactive energy : class 2 EN LCD Number of digits: 8 (7+1) Height of digits: 4.52 mm 7.5 LED Colour: Pulse rate: LED on: red 1 imp/wh no load indication Page 14 to 17

15 7.6 Pulse output (option) Pulse rate: Pulse duration: Rated voltage DC: Switched current Standard: 1 imp/wh 32 ± 2 ms 40 V max 40 ma max EN (A&B) 7.7 Serial communication (option) Type: RS485 Speed: 1200 to bit/s Frame: 8, N, 2 Protocol: MODBUS RTU 7.8 Optical communication Type: IR Connection: via WM USB adapter Speed: bit/s Frame: 8, N, 2 Protocol: MODBUS RTU Address: 33 fixed 7.9 Tariff input (option) Rated voltage: 230 V (± 20%) Input resistance: 450 kohm 7.10 Ambient conditions and Safety: According standards for indoor active energy meters. Temperature and climatic condition according to EN Dust/water protection: IP50 Operating temp. range: C Storage temp. Range C Enclosure material: self extinguish complying UL94 V Indoor meter: yes Degree of pollution: 2 Protection class: II AC voltage test: 4 kv Installation Category: 300 Vrms cat. III Standard: EN Page 15 to 17

16 8 DIMENSIONAL DRAWINGS Page 16 to 17

17 9 DATA FOR ORDERING WM CP N A Meter type WM1 6 WM1M6 (MID version) Voltage input range (phase to neutral) 230 I/O module (option) WW Without TW Tariff module CW Comm. RS 485 WP Pulse output TP Tariff input + pulse output CP Comm. RS485 + pulse output Push button for LCD N No Counter and LCD setting A Absolute counter B Bidirectional counter C Custom settings Description of default counter and LCD setting A, B: I/O module WW, WP, CW, CP TW, TP Counter setting Energy counters E1 E2 E3 E4 A Ep Eq E1,E2 LCD B Ep+ Ep Eq+ Eq E1,E2,E3,E4 A Ep T1 Ep T2 Eq T1 Eq T2 E1,E2,E3,E4 B Ep+ T1 Ep+ T2 Ep T1 Ep T2 E1,E2,E3,E4 Options for custom settings C: Counter setting (E1 to E4): Type of energy: Tariff: LCD settings: Total Absolute Active Energy (kwh) Ep Total Absolute Reactive Energy (kvarh) Eq Total Absolute Apparent Energy (kvah) Es Import Active Energy (kwh) Ep+ Export Active Energy (kwh) Ep Import Reactive Energy (kvarh) Eq+ Export Reactive Energy (kvarh) Eq none, T1, T2, both E2, E3, E4, P, Q, S, PF, U, f, I Izdaja Izdelal Opis spremembe Datum 3.00 MUROVEC Matjaž Page 17 to 17