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SPECIFICATIONS:
Part Number: IS200TREGH4B
Manufacturer: General Electric
Series: Mark VI
Product Type: Simplex Gas Trip Emergency Terminal Board
Number of Trip Solenoids: 3
Relay Outputs: 3
Connectors: JX1, JY1, JZ1
Operating Voltage Range: 18–30 V DC
Operating Temperature: 0°C to 60°C
Trip Inputs: 125/24 V DC
Solenoid Response Time: 0.1 sec
Size: 17.8 cm wide x 33.02 cm
Repair: 3-7 Days
Country of Origin: USA
Availability: In Stock
Manual: GEH-6421l
FUNCTIONAL DESCRIPTION:
IS200TREGH4B is a Simplex Gas Trip Emergency Terminal Board manufactured and designed by General Electric as part of the Mark VI Series used in GE Speedtronic Gas Turbine Control Systems. The TREG board plays a critical role in turbine protection systems by supplying power to up to three emergency trip solenoids. These solenoids are responsible for rapidly shutting down the turbine in the event of a fault or unsafe operating condition. The TREG board operates under the supervision of the I/O controller and functions in coordination with the TRPG terminal board to create a dependable and redundant trip system. In this setup, TREG delivers the positive DC power to the trip solenoids, while TRPG provides the negative return path, together forming a complete and controlled electrical circuit for solenoid activation.
Each of the three trip solenoids can be individually connected between TREG and TRPG, allowing for flexible system design and segmentation of protective functions. The I/O controller, which monitors various critical turbine parameters such as speed, temperature, and pressure, is programmed to trigger the trip solenoids under emergency conditions. It also oversees essential protective functions, including emergency overspeed protection, emergency stop (E-Stop) control, and general shutdown logic.
FEATURES OF SIMPLEX GAS TRIP EMERGENCY TERMINAL BOARD
A key feature of this setup is the 12 relays located on the TRPG board. These relays are grouped into three sets of three, forming a 2-out-of-3 voting logic circuit for each of the three trip solenoids. This trip logic architecture increases system reliability and helps prevent nuisance trips due to single-point failures or signal noise. If two of the three relays in any group vote to trip, the corresponding solenoid is energized, initiating the turbine shutdown process.
This highly secure and redundant design ensures that turbine operations can be safely halted during dangerous conditions, thereby protecting both personnel and equipment. Additionally, the TREG and TRPG setup supports various board configurations tailored to specific voltage requirements and redundancy strategies.
The system accommodates different board types—such as H1B, H2B, H3B, H4B, and H5B—to meet the operational demands of 24V or 125V applications, as well as redundant TREG implementations. Choosing the appropriate board type and maintaining strict adherence to configuration standards is crucial for the effective and safe operation of the trip system. In redundant TREG applications, it is typical to find one H3B and one H4B board used together. System repairs must be done with the correct board type to maintain the control power separation designed into these systems.
INSTALLATION:
The positive DC control power, either 24V or 125V, depending on system requirements, should be connected to the TREG board, while the TRPG terminal board provides the negative return path. Trip solenoids must be wired between the TREG and TRPG boards, following the designated output channels. The 12 relay outputs on the TRPG should be properly connected to their respective circuits, ensuring the implementation of the 2-out-of-3 voting logic for solenoid control. Feedback circuits for monitoring and diagnostics should also be connected from the terminal board to the I/O controller.
System integration involves connecting the TREG/TRPG assembly to the I/O controller using the correct connectors such as JX1, JY1, and JZ1. In systems using redundant TREG boards, specialized H1B board versions like H3B, H4B, or H5B should be installed to provide independent power paths and ensure system reliability. It is essential to check that all diode isolation circuits and feedback loops for economizing relay operations are correctly configured.
OPERATION:
The TREG (Trip Emergency Generator) board is fully managed by the I/O controller, which handles all control logic and trip commands. The primary connections from TREG to the control system include the J2 power cable, which supplies 125 V DC to the trip solenoids, and the solenoid wiring itself, which carries the output signals used to initiate turbine shutdown in emergencies. In simplex system configurations—where redundancy is limited to a single control path—an additional cable from the J1 connector is used to transmit a trip signal to the TSVO (Trip Servo Valve Output) terminal board. This signal enables a servo valve clamp function, which is critical for holding or closing control valves (such as steam or fuel valves) during a turbine trip. The clamp function ensures that valves remain in a safe, shut position to prevent energy release or hazardous conditions, supporting the system’s overall safety and shutdown reliability. This integrated communication and power distribution structure allows TREG to effectively coordinate with TRPG and other modules to manage trip solenoid operation with precision.
CONTROL OF TRIP SOLENOIDS:
Both TRPG and TREG control the trip solenoids so that either one can remove power and actuate the hydraulics to close the steam or fuel valves. The nine trip relay coils on TREG are supplied with 28 V dc from the I/O controller. The trip solenoids are supplied with 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 is provided from the turbine control for the solenoids, which energize in the run mode and de-energize in the trip mode. Diagnostics monitor each 125 V dc feeder from the power distribution module at its point of entry on the terminal board to verify the fuse integrity and the cable connection.
Two series contacts from each emergency trip relay (ETR1, 2, 3) are connected to the positive 125 V dc feeder for each solenoid, and two series contacts from each primary trip relay (PTR1, 2, 3 in TRPG) are connected to the negative 125 V dc feeder for each solenoid. An economizing relay (KE1, 2, 3) is supplied for each solenoid with a normally closed contact in parallel with the current limiting resistor. These relays are used to reduce the current load after the solenoids are energized. The ETR and KE relay coils are powered from a 28 V dc source from the I/O controller. Each PPRO I/O pack in each of the R8, S8, and T8 sections supplies an independent 28 V dc source.
The 28 V dc bus is current limited and used for power to an external manual emergency trip contact, shown as E-STOP. Three master trip relays (K4X, K4Y, K4Z) disconnect the 28 V dc bus from the ETR, and KE relay coils if a manual emergency trip occurs. Any trip that originates in either the protection module (such as a TIOS) or the TREG (such as a manual trip) will cause each of the three protection modules to vote to shut down or remove power to one IONet the control module, and may be used to identify the source of the trip.
WOC maintains the largest inventory of replacement parts for GE Speedtronic Turbine Control Systems. In addition to supplying unused and refurbished boards, each backed by a warranty, we also offer expert repair services for your faulty components. Our dedicated team is available 24/7 to support your OEM and automation needs. For inquiries regarding pricing, availability, or repair services, please reach out to us via phone or email. We're here to help with all your turbine control system requirements.
What is the function of the Simplex Gas Trip Emergency Terminal Board?
The board is responsible for managing emergency shutdowns by controlling trip solenoids that isolate fuel and steam supplies to the turbine. It ensures safe and rapid turbine shutdown during fault conditions by executing trip signals from the I/O controller.
How many trip solenoids can the terminal board control?
The board can support up to three emergency trip solenoids, forming a 2-out-of-3 voting logic system for enhanced safety and reliability in shutdown scenarios.
What is the typical power supply configuration for the trip solenoids?
Trip solenoids are powered with 125 V DC through the J2 connector from the TREG board. The return path (negative side) is provided through the TRPG terminal board.
What controls the trip relays on the terminal board?
The trip relays are energized using 28 V DC from the I/O controller. This voltage powers both the emergency trip relays (ETR) and economizing relays (KE) to control solenoid activation and minimize load.
