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
Size 17.8 cm wide x 33.02 cm, high
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
Temperature: 0 to 60°C
Number of trip solenoids: Three
Availability: In Stock
Country of Manufacture: United States (USA)

Functional Description

IS200TREGH5B is an Turbine Emergency Trip Terminal Board developed by GE. It is a part of Mark VI control system. 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 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.


  • VPRO Control: The primary control and coordination of the system are managed by the VPRO board. This board is the brain behind the functions, ensuring that the turbine operates optimally and safely within the specified parameters. It oversees various aspects, including speed control and load management, to maintain the desired turbine performance.
  • Connection Components: The system relies on specific connections to function effectively. Two significant components in this regard are the J2 power cable and the trip solenoids.
  • J2 Power Cable: The J2 power cable is a pivotal link that supplies the necessary electrical power. It ensures that the TREG has the energy required to execute its functions effectively. This power connection is fundamental to the overall performance of the system.
  • Trip Solenoids: Trip solenoids play a critical role in the system by providing a means to initiate specific actions in response to critical conditions. These solenoids can trip or shut down the turbine when necessary to prevent potential damage or hazardous situations.
  • Simplex Systems: In simplex systems, there's an additional component, a third cable, that carries a trip signal from J1 to the servo terminal board. This signal is instrumental in ensuring the safe and controlled operation of the turbine.
  • Servo Terminal Board: The servo terminal board is responsible for executing specific actions upon turbine trip. One of its crucial functions is providing a servo valve clamp function. This function helps stabilize and control the turbine's behavior when a trip signal is received, preventing any erratic movements or undesirable actions.

Solenoid Trip Tests

  • The Mark VI controller plays a crucial role in initiating and overseeing solenoid trip tests. These tests are essential for verifying the proper functioning of trip solenoids within the system. The controller provides a user-friendly interface for conducting these tests, ensuring the reliability and safety of the overall system.
  • The Mark VI controller offers the capability to perform online trip tests, allowing each of the trip solenoids to be individually and manually tripped. This can be accomplished through two distinct methods:
    • PTR Relay Activation: The controller can initiate the tripping of solenoids by actuating PTR (Protective Trip Relay) relays. This method ensures precise control over the tripping process.
    • ETR Relay Activation: Alternatively, the controller can trigger the solenoids via ETR (Emergency Trip Relay) relays, which are integral components of the protection module. This redundancy adds an extra layer of reliability to the testing process.
  • To enhance safety and monitoring during the solenoid trip tests, a contact from each solenoid circuit is wired back as a contact input. This setup provides a positive indication that the solenoid has been successfully tripped. It serves as a confirmation that the trip operation has been executed as intended, adding a layer of assurance to the testing procedure.
  • In addition to online testing, the Mark VI controller offers primary and emergency offline overspeed tests. These tests are specifically designed to verify the functionality of the system under simulated trip overspeed conditions. By subjecting the system to these offline overspeed tests, users can confirm the system's ability to respond appropriately to software-simulated trip overspeed scenarios.

World of Controls has the most comprehensive collection of GE Mark VI components. Please contact WOC as soon as possible if you require any extra information.


Frequently Asked Questions


What is IS200TREGH5B?
It is an Turbine Emergency Trip Terminal Board developed by GE

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.