GE IS200TREGH5B IS200TREGH5BDC | Trip Emergency Board

Core Function and System Role

The GE IS200TREGH5B provides emergency trip functionality for Mark VI turbines. Specifically, this board controls three independent trip solenoid circuits. Moreover, it implements redundant voting logic for fail-safe operation. The IS200TREGH5BDC variant includes enhanced coil suppression for inductive loads.

Technical Specifications Overview

This trip emergency board features three independent trip channels. Each channel drives a 125 Vdc solenoid with 2oo3 voting logic. Furthermore, the board provides status feedback for each trip circuit.

Parameter	Specification
Part Number	IS200TREGH5B / IS200TREGH5BDC
Type	Trip Emergency Board / Turbine Protection Module
Trip Channels	3 Channels
Voting Architecture	2oo3 (Hardware-Based)
Coil Voltage	125 Vdc Nominal
Coil Current	1.5 A per Channel
Response Time	<8 ms
Status Outputs	3 Relay Contacts, Form C
Surge Suppression	MOV + Diode (BDC Variant)
Logic Power Supply	24 Vdc ±15%
Connector Types	2 x 50-pin D-sub, 2 x Terminal Blocks
Dimensions (W x H x D)	215 x 125 x 32 mm
Weight	0.78 kg
Onboard Energy Storage	6 x 680 µF, 160V Capacitors

Connector Layout and Component Count

The board uses two terminal blocks for solenoid wiring. For instance, block TB1 connects to trip solenoids A and B. Meanwhile, block TB2 connects to trip solenoid C and auxiliary contacts. Two 50-pin D-sub connectors interface with the main controller. The IS200TREGH5BDC adds six flyback diodes for inductive kickback protection.

Energy Storage and Trip Reliability

This trip board includes large capacitance for hold-up during power sags. Specifically, six 680 µF capacitors store energy for solenoid actuation. Therefore, the board maintains trip capability even during brief interruptions. Additionally, onboard LED indicators show system status. For example, green LEDs confirm proper logic power and solenoid readiness. Red LEDs illuminate when the board initiates a trip condition.

Diagnostic Features and Self-Checking

The board continuously performs self-diagnostics on all trip circuits. Consequently, it detects open coils or wiring faults within 50 milliseconds. Moreover, the GE IS200TREGH5B IS200TREGH5BDC includes a hardware watchdog timer. This feature resets the logic if the controller stops communicating. An onboard fault relay signals any internal failure to the protection system.

Maintenance and Hot Replacement

You can replace this trip board without shutting down the turbine. Thus, mean time to repair remains under fifteen minutes. The board stores no calibration data locally. Therefore, you simply install the replacement and resume normal protection.

Industrial Applications

This trip emergency board works inside GE Mark VI protection panels. For reliable GE turbine protection, the IS200TREGH5B and IS200TREGH5BDC deliver exceptional safety performance. They provide critical overspeed and over-temperature tripping for steam and gas turbines.