IS200TREGS4B - Trip Emergency Board

IS200TREGS4B - Trip Emergency Board IS200TREGS4B - Trip Emergency Board

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Part No.: IS200TREGS4B
Manufacturer: General Electric
Series: Mark VIe
Technology: Surface mount
Suppression: MOV across the solenoid
Relay outputs: Three
Trip interlock isolation: Optical isolation to 1500 V on all inputs
Trip interlock filter: Hardware filter, 4 ms
Availability: In Stock
Country of Manufacture: United States (USA)

Functional Description

IS200TREGS4B is a Turbine Trip Emergency Board developed by GE. It is a part of Mark VIe control system. In Mark VI systems, the TREG terminal board works in conjunction with the VPRO (Voted Protection) module, which coordinates the voting logic for the trip solenoids. The connection between the TREG and VPRO is established using cables with molded plugs, ensuring secure and reliable communication between the components. The terminal board, with its control over emergency trip solenoids and its integration with the I/O controller and VPRO module, plays a pivotal role in ensuring the safe and efficient operation of gas turbine systems. Proper maintenance, board selection, and adherence to design specifications are essential for maintaining the integrity and reliability of these critical systems.


  • Three master trip relays (K4X, K4Y, K4Z) are responsible for disconnecting the 28 V DC bus from the ETR and KE relay coils in case of a manual emergency trip. Any trip originating from the protection module (e.g., EOS) or the TREG (e.g., manual trip) will trigger the transmission of a trip command over the IONet to the control module. This capability helps identify the source of the trip and enables effective troubleshooting.
  • In addition, the K4CL servo clamp relay will energize and send a contact feedback directly from the TREG terminal board to the TSVO servo terminal board. The TSVO terminal board disconnects the servo current source from the terminal block and applies a bias to drive the control valve closed. This feature is utilized in simplex applications to protect against the servo amplifier failing high, enhancing the system's safety and reliability.


  • TREG is under complete control of the I/O controller, with its interactions limited to just two connections - the J2 power cable and the trip solenoids. In cases involving simplex systems, an additional third cable is employed to transmit a trip signal from J1 to the TSVO terminal board.
  • This specific cable serves the crucial role of enabling a servo valve clamp function during turbine trips, enhancing system stability and performance.

Solenoid Trip Testing

  • The controller's application software serves as the means to initiate tests on the trip solenoids. Online testing capabilities enable the individual tripping of each solenoid, either through the PTR relays controlled by the controller or via the ETR relays originating from the protection module. A contact from each solenoid circuit is connected as an input, ensuring a positive indication that the solenoid has been successfully tripped.
  • Moreover, the system offers primary and emergency offline overspeed tests for the purpose of confirming the actual trips resulting from software-simulated overspeed conditions. These tests provide a comprehensive verification of the system's response to various trip scenarios, ensuring its reliability and safety.

Product Attributes

Trip Solenoid Circuits

  • The circuits are designed to meet NEMA class E creepage and clearance standards, ensuring safe and reliable operation.
  • All circuits are capable of handling the load and can safely clear a 15 A fuse even when fully loaded.

Solenoid Response Time

  • The solenoid response time is defined by a low L/R time constant of 0.1 seconds.
  • Additionally, a suppression MOV (Metal Oxide Varistor) is implemented across the solenoid to manage electrical noise and enhance performance.

Relay Outputs

  • There are three economizer relay outputs, each with a delay of two seconds before energizing.
  • The system also includes a driver-to-breaker relay, K25A on TTUR, and a servo clamp relay on TSVO for precise control and protection.

Solenoid Control Relay Contacts

  • The relay contacts are rated to effectively interrupt inductive solenoid loads operating at 125 V dc and 1 A, ensuring reliable control and safety.
  • The system can accommodate a bus voltage range from 70 to 145 V dc, providing flexibility in various operating conditions.

Trip Inputs

  • Seven trip interlocks are integrated into the system and connected to the I/O controller protection module, operating at 125/24 V dc for comprehensive protection and control.
  • Dedicated hard-wired emergency stop trip interlock operating at 24 V dc to ensure swift and reliable emergency shutdown capabilities.

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


Frequently Asked Questions


What is IS200TREGS4B?
It is an Turbine Trip Emergency Board developed by GE

Why would someone want to disable the second emergency stop input?
In some installations or applications, the second emergency stop input may not be necessary or required. Disabling it using the jumper ensures that the system functions as needed without unnecessary inputs.

Is the jumper a permanent configuration, or can it be changed later?
The jumper configuration is not permanent and can be easily changed if the system requirements or setup change over time. Users can adjust the jumper as needed to adapt the terminal board to different scenarios.

Is there any documentation or labeling on the terminal board to indicate the jumper's purpose and location?
Yes, the terminal board typically comes with clear documentation and labeling that indicates the purpose and location of the jumper. This ensures users can easily identify the correct terminals to bridge when configuring the board.