IS230TRPAH1A - Turbine Primary Trip Terminal Board

IS230TRPAH1A - Turbine Primary Trip Terminal Board IS230TRPAH1A - Turbine Primary Trip Terminal Board

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Part Number: IS230TRPAH1A
Manufacturer: General Electric
Series: Mark VIe
Function: Turbine Primary Trip Terminal Board
Number of Inputs: 3 x 4 Voltage
Number of Outputs: 2 trip
Temperature: -30 to 65�C
MPU pulse rate range: 2 Hz to 20 kHz
MPU pulse rate accuracy: 0.05%
Number of outputs: 2 trip contacts
MPU input circuit sensitivity: 27 mV pk
Availability: In Stock
Size: 33.0 cm x 17.8 cm
Technology: Surface mount
Country of Manufacture: United States (USA)
Manual: GEH-6721D


IS230TRPAH1A is a Turbine Primary Trip Terminal Board manufactured and designed by General Electric as part of the Mark VIe Series used in GE Distributed Control Systems. The turbine primary trip terminal board, TRPAH1A, works with the PTUR turbine I/O packs or with the TTUR terminal board as part of the Mark VIe system. The inputs and outputs are as follows:

  • 12 passive pulse rate devices (four per R/S/T section) sensing a toothed wheel to
    measure the turbine speed. Or, six active pulse rate inputs (two per TMR
  • 2 24 V dc (H1) or 125 V dc (H2) TMR voted output contacts to the main breaker
    coil for the trip coil.
  • 4 24-125 V DC voltage detection circuits for monitoring trip string.


TTL pulse rate pick-ups, voltage detection, E-STOP, and the breaker relay are wired to the I/O terminal blocks TB1. Passive pulse rate pick-ups are wired to TB2. Each block is held down with two screws and has 24 terminals accepting up to #12 AWG wires. A shield termination strip attached to the chassis ground is located immediately to the left of each terminal block. The TRPA must be configured for the desired speed input connections using the following table. Jumpers JP1 and JP2 select fanning of the R section pulse rate pickups to the S and T PTURs.


The TRPA board is designed for application in two different ways. When a TTUR terminal board is used to hold three PTUR I/O packs the TRPA terminal board may be connected using three cables with DC-37 pin connectors on each end. In this mode of operation, the TRPA provides two contact-voted trip relay outputs, ESTOP, and four voltage sensors. TTUR provides the normal set of features described for that board. The TRPA speed inputs are not active and should not be connected with this board arrangement. The TRPA board may also be used with three PTUR I/O packs mounted directly on the TRPA. In this mode of operation, the speed inputs to TRPA become active paths into the PTUR allowing for a single terminal board primary trip solution.

WOC has the largest stock of GE Distributed Control System Replacement Parts. We can also repair your faulty boards. WORLD OF CONTROLS can also supply unused and rebuilt backed-up with a warranty. Our team of experts is available round the clock to support your OEM needs. Our team of experts at WOC is happy to assist you with any of your automation requirements. For pricing and availability on any parts and repairs, kindly get in touch with our team by phone or email.


Why is the Turbine Primary Trip Terminal Board important?

The board plays a vital role in safeguarding the turbine and associated equipment from potential risks such as overloading, overheating, or other operational abnormalities. It acts as a critical interface between the turbine system and its control and monitoring systems.

What is a Turbine Primary Trip Terminal Board?

The Turbine Primary Trip Terminal Board is a crucial component in turbine systems, serving as a central point for connecting various sensors, switches, and control circuits related to turbine operation.

What is the function of the Turbine Primary Trip Terminal Board?

Its primary function is to facilitate the monitoring and control of critical parameters within the turbine system. It helps in detecting abnormal conditions and initiating appropriate shutdown procedures to prevent damage or accidents.