Electronic Control Options for Automatic Control Valves. Jody Malo Singer Valve

Transcription

1 Electronic Control Options for Automatic Control Valves Jody Malo Singer Valve

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3 Restriction Manual Ball Valve Inlet Outlet

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6 Advantages: No power required Ease of use Been used for 80+ years Disadvantages: Need to be set or adjusted locally Difficult if in remote location Generally only one set point on pilot No feed back to control systems (SCADA)

7 Sill use the basic main valve. We exchange component(s) of the pilot system to allow electronic input into it. In most cases this is a electronic solenoid valve

8 Usual Types: 2 to 4 way Acting Configurations: Normally Open Configuration Normally Closed Configuration Power Options: AC Power VAC DC Power VDC

9 Normally Closed: Energize to open Normally Open: Energize to close Solenoid is just an electromagnet.

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12 Manual Bypass Manual Bypass Speed Control Needle Valve Solenoid Valve Solenoid Valve Speed Control Needle Valve (Closing) (Opening) Strainer

13 1. Local Manual Control 2. Remote Scada Control

14 3. Local Control Panels Single Process Control Panel Multi Process Control Panel

15 Process Control is done by using a PROCESS VARIABLE(PV) as feed back to make measurement and correction to a process to match a wanted set point. Examples Flow Control Level Control Position Control Pressure Reducing/ Pressure Sustaining Control

16 Single Process Control

17 Step 1: Setting a Single Process Setpoint Step 2: Obtaining a Single Process Variable Flow Meter Pressure Transmitter Option A:Local Setpoint Level Sensor Position Sensor Option B:Remote Setpoint

18 Step 3: Compare Process Setpoint to Process Variable and Make Adjustments Process Variable Setpoint 4 20 ma Process Variable Signal TOO HIGH!! TOO LOW!! Flow Controlling Rate of Flow

19 Single Process Control Panels Standardized all-in-one multiple application single process controller that can complement a wide range of hydraulic applications Designed for Control of 2SC-PCO, PT-4SC & PR, RPS, RF- 420DC Control Valves Control Options: Modulating Control: Valve Position Pressure Level Flow 4 20mA Actuator Control: 420DC Pilot Mounted Actuator ON/OFF Control : Large & Slow Processes (e.g. Tank Level Control)

20 Panel Feature/Specification Electrical Specification External Power Supply: VAC, 50-60Hz 24VDC-Optional Model Available Internal Power Supply: 24VDC, 2.5A Can be used to power the Sensor/420DC etc.

21 Panel Feature/Specification Environmental Specification: Enclosure: Polycarbonate (standard) Clear or Opaque Cover Available Enclosure Rating: NEMA 4X (IP66, 67) Indoor/Outdoor Rated Operating Temperature: -10 to 60 C (14 to 140 F) Relative Humidity: 5 to 90% RH (noncondensing)

22 Panel Feature/Specification Remote SCADA Serial/Ethernet: Modbus Capable Trending Graphs Setpoint & Process Variable vs. Time Setpoint Scheduling Up to 10 Setpoint(s) Changes per day Data logging Uses a MicroSD Card Saves Data as a.csv (MS Excel File) Up to 2GB of Data Changeable Logging Interval (min1sec interval) Data-loss prevention feature

23 SAMPLE DATA Flow Control Process Variable and Setpoint (USGPM) :39:22 13:40:48 13:42:14 13:43:41 13:45:07 13:46:34 Process Variable Setpoint

24 FEATURES/SPECIFICATION Analog Inputs: 4-20mA, 12-bit Resolution Transmitter Input Remote Setpoint Input Surge Suppression and Short-Circuit Protection Analog Output: Retransmission Output: 4-20mA Process Variable or Setpoint Digital Inputs: Valve Override Force Last Force Close Force Open Digital Outputs Solid State Relays for Solenoid Control Mechanical Relays for Alarm and Indication

25 Multiple Process Control

26 Step 1: Setting Multiple Process Setpoints Step 2: Obtaining a Multiple Process Variable Flow Meter Pressure Transmitter Option A:Local Setpoint Level Sensor Position Sensor Option B: Remote Setpoint

27 Step 3: Compare Process Setpoints to Process Variables and Make Adjustments 4 20 ma Process Variable Signal TOO LOW!! TOO HIGH!! 4 20 ma Process Variable Signal Flow Rate of Flow and Pressure Sustaining

28 FEATURES AND BENEFITS: Auto Voltage 90 to 250VAC; no need for transformer 24VDC available; can be powered by battery or solar Solid state relays for solenoid interface; reliable and no contacts to wear NEMA 4X Enclosure pre-wired; simple indoor/outdoor field wiring Easy to read touchscreen display and adjustments;

29 FEATURES AND BENEFITS CONT : Accepts 4-20mA, 1-5VDC, 0-10VDC industry standard signals; will work with most transmitters Digital communication via Modbus Protocol (slave); compatible with most SCADA system. PID Control Algorithm; stable and accurate Process control 100% CUSTOMIZABLE TO SUIT YOUR APPLICATION NEEDS.

30 Advantages: Multiple process control in one valve Remote setting Feedback into Control Systems (SCADA) Flexible and changeable Can add a mechanical back-up for power failure Disadvantages: Power required (either AC or DC) Increased cost compared to Mechanical Valve package Increase training for staff used to Mechanical

31 Sandy - Oregon USA (1x) MCP-TP Control Panel (1x) Singer 36 S106-2SC-PCO-C-AC (1x) Singer 24 S106-2SC-PCO-C-AC

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