IS200VRTDHID

VME IO CARD

Product DESCRIPTION

Part Number

IS200VRTDHID

Manufacturer

General Electric

Country of Manufacture

As Per GE Manufacturing Policy

Series

Mark VI/VIe

Function

Module

Availability

In Stock

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TECHNICAL SPECIFICATIONS FOR GE - IS200VRTDHID

IS200VRTDHID is an RTD Processor Board developed by GE. It is a part of the Mark VI control system. The Resistance Temperature Device (RTD) Input (VRTD) board is designed to accurately measure temperature using RTD sensors. Here's how it operates: The board accepts 16 three-wire RTD inputs, providing ample capacity for temperature monitoring in industrial applications. These inputs are connected to an RTD terminal board (such as TRTD or DRTD) via cables with molded fittings.

SIGNAL TRANSMISSION

The terminal board is connected to the VME rack where the VRTD processor board is located.

The board excites the RTDs (Resistance Temperature Devices), initiating the temperature measurement process.

The resulting signals from the RTDs are then transmitted back to the VRTD board for processing.

DIGITAL CONVERSION

Upon receiving the signals from the RTDs, the board converts them into digital temperature values.

These digital temperature values are then transferred over the VME backplane to the VCMI (VME Control and Monitoring Interface) board, which further communicates with the controller.

INTEGRATION WITH THE CONTROLLER

The controller receives the digital temperature values from the VCMI board, allowing it to monitor and control temperature-dependent processes within the industrial system.

This seamless integration ensures accurate temperature measurement and control, contributing to the overall efficiency and reliability of the system.

EXCITATION CURRENT

The board supplies a 10 mA DC multiplexed excitation current to each RTD through the terminal board.

This excitation current is not continuous but is provided intermittently to energize the RTDs for temperature measurement.

SIGNAL PROCESSING

The resulting signal from each RTD returns to the VRTD board for further processing.

It utilizes a Voltage Controlled Oscillator (VCO) type Analog-to-Digital (A/D) converter.

This converter employs voltage-to-frequency converters and sampling counters to convert the analog signals from the RTDs into digital values.

SCANNING FREQUENCY

The converter samples each signal and the excitation current four times per second in normal mode scanning.

In fast mode scanning, the sampling frequency is increased to 25 times per second.

The sampling interval is adjusted based on the power system frequency to ensure accurate temperature measurements.

LINEARIZATION AND RTD TYPES

Software implemented in the digital signal processor performs linearization of the RTD signals.

This allows for the accurate conversion of temperature values, with support for 15 different RTD types.

FAULT DETECTION AND CHANNEL MANAGEMENT

The board detects open and short circuits in the RTD inputs by monitoring for out-of-range values.

If an RTD is determined to be outside the hardware limits, it is automatically removed from the scanned inputs to prevent adverse effects on other channels.

Repaired channels are reinstated automatically after 20 seconds or can be manually reinstated by the user.

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