IS200TREGH5B - Emergency Trip Terminal Board

IS200TREGH5B - Emergency Trip Terminal Board IS200TREGH5B - Emergency Trip Terminal Board

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Part No.: IS200TREGH5B
Manufacturer: General Electric
Series: Mark VI
Technology: Surface mount
Trip interlock isolation: Optical isolation to 1500 V on all inputs
Trip interlock filter: Hardware filter, 4 ms
Trip interlock AC voltage rejection: 60 V rms 50/60 Hz at 125 V dc excitation
Operating Temperature: 0 to 60°C
Size 17.8 cm wide x 33.02 cm, high
Number of trip solenoids: 3
Repair: 3-7 Day
Availability: In Stock
Weight: 2 lbs
Country of Origin: United States
Manual: GEH-6721


IS200TREGH5B is an Emergency Trip Terminal Board manufactured by General Electric as part of the Mark VI Series used in gas turbine control systems. In the system configuration, up to three trip solenoids can be connected between the TREG and TRPG (Trip Power Ground) terminal boards. The TREG board supplies the positive side of the DC power to the solenoids, while the TRPG board provides the negative side, forming a complete circuit for the solenoid operation. This variant of the H1B module is specifically tailored for deployment in systems featuring redundant TREG boards. The essential feedback circuitry and the supply of power for economizing relays are exclusively facilitated through the JZ1 connector.


  • Both TRPG and TREG have control over the trip solenoids, allowing either one to remove the power and actuate the hydraulics to close the steam or fuel valves. The nine trip relay coils on the TREG board are supplied with 28 V DC from the I/O controller. On the other hand, the trip solenoids receive 125 V DC through plug J2 and draw up to 1 A with a 0.1-second L/R time constant.
  • A separately fused 125 V DC feeder from the turbine control is provided for the solenoids. The solenoids are energized in the run mode and de-energized in the trip mode.
  • Diagnostics are in place to monitor each 125 V DC feeder from the power distribution module at its entry point on the terminal board. This is done to verify the fuse integrity and the cable connection, ensuring proper functioning and safety. The flexibility offered by the application software empowers the system operator to execute and monitor the trip solenoid tests seamlessly.
  • With the ability to conduct online and offline tests, the operator can confidently verify the system's performance under various conditions, making informed decisions based on the test results.
  • Relay outputs on the servo terminal board consist of the servo clamp relay, which is responsible for servo control and stabilization.
  • The solenoid control relay contacts are rated to interrupt inductive solenoid loads at 125 V DC and 1 A, ensuring their effectiveness in managing solenoid-driven components within the system. The bus voltage for this system can vary from 70 to 145 V DC.
  • To deactivate the second emergency stop input when it's not needed, simply insert a jumper between terminals 15 and 17 on the terminal board.


  • Three Trip Solenoids: The first I/O terminal block plays a pivotal role in the system, as it directly manages the wiring of three essential trip solenoids. These solenoids are crucial for executing specific actions in response to critical conditions or emergencies, ensuring the safe and efficient operation of the equipment.
  • Economizing Resistors: Additionally, the first terminal block also hosts the connection for economizing resistors. These resistors are integral for regulating and optimizing energy consumption within the system. By controlling the flow of electrical current, they help maintain operational efficiency while preventing unnecessary power wastage.
  • Emergency Stop Functionality: The first terminal block is also the primary connection point for the emergency stop mechanism. In case of an unforeseen emergency or critical situation, this stop function can be initiated through the terminal block, swiftly halting the system's operations to prevent any potential hazards or damage.
  • Trip Interlocks: The second terminal block, on the other hand, offers the flexibility to wire up to seven trip interlocks. These trip interlocks are instrumental in enhancing the safety and reliability of the system by providing additional layers of protection and control. They can be configured to trigger specific responses or shutdown sequences in response to various predefined conditions.

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What information do the ID devices in connectors JX1, JY1, and JZ1 hold?

Connectors JX1, JY1, and JZ1 on the TREG board are equipped with ID devices. These read-only chips are coded with important information, including the terminal board's serial number, board type, revision number, and the specific plug location.

What is the purpose of reading the ID devices on the TREG connectors?

Reading the ID devices on the TREG connectors is essential for proper system compatibility and validation. The I/O controller interrogates these chips to ensure that the correct terminal board is installed in the appropriate location, preventing hardware incompatibility issues.

How does the system respond to a mismatch between the read ID device and the expected values?

In case the I/O controller encounters a mismatch between the read ID device and the expected values, it triggers a hardware incompatibility fault. This fault condition helps prevent potential errors that could arise from using an incompatible terminal board.