IS200TRPAH1AFC - Turbine Primary Trip Terminal Board

IS200TRPAH1AFC - Turbine Primary Trip Terminal Board IS200TRPAH1AFC - Turbine Primary Trip Terminal Board

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Part No.: IS200TRPAH1AFC
Manufacturer: General Electric
Country of Manufacture: United States of America (USA)
Temperature Operating: -30 to 65 o C
ESTOP/TRP voltage source: 24 V dc no-load, 0.3 to 1K source impedance
Technology: Surface mount
Size: 33.0 cm high x 17.8 cm , wide
MPU pulse rate range: 2 Hz to 20 kHz
MPU pulse rate accuracy: 0.0 percent of reading
MPU input circuit sensitivity: 27 mV pk
Product Type: Turbine Primary Trip Terminal Board
Availability: In Stock
Series: Mark VIe

Functional Description

IS200TRPAH1AFC is a Turbine Primary Trip Terminal Board developed by GE. It is a part of Mark VIe control system. The terminal board is an integral part of the Mark VIe system, collaborating either with the PTUR turbine I/O packs or the TTUR terminal board.


  • Speed Measurement: 12 passive pulse rate devices, distributed among the R/S/T sections (four per section). These devices utilize a toothed wheel to gauge turbine speed. Alternatively, six active pulse rate inputs, with two allocated per TMR section.
  • Output Contacts: Two types of TMR voted output contacts, 24 V dc (H1) or 125 V dc (H2) configurations. These contacts are connected to the primary breaker coil for trip coil operations.
  • Voltage Detection Circuits: Four circuits dedicated to monitoring trip string, operating within the range of 24-125 V dc.
  • For TMR systems, the signal distribution branches out to various connectors: PR3, PS3, PT3, JR4, JS4, and JT4 connectors serve as pathways for signals in TMR configurations.
  • This setup enables comprehensive monitoring and control over turbine speed, trip coil operations, and voltage detection, ensuring the efficient and safe functioning of the system within the Mark VIe framework.


The installation process for various components involves wiring to specific I/O terminal blocks and configuring the TRPA (Turbine Primary Trip Terminal Board) for desired speed input connections. Here are the steps involved:

  • Component Wiring: TTL Pulse Rate Pick-Ups, Voltage Detection, E-STOP, and Breaker Relay: These components are wired to the I/O terminal blocks TB1.
  • Passive Pulse Rate Pick-Ups: These are connected to TB2. Each terminal block (TB1 and TB2) is secured using two screws and accommodates 24 terminals that accept wire sizes of up to #12 AWG.
  • Shield Termination Strip:Adjacent to each terminal block, there is a shield termination strip attached to the chassis ground. This strip is crucial for grounding purposes.
  • TRPA Configuration: The TRPA (Turbine Primary Trip Terminal Board) requires configuration for desired speed input connections. This configuration involves using jumpers JP1 and JP2 to select the fanning of R section pulse rate pickups to the S and T PTURs.
  • Terminal Block Details: TB1 and TB2 are organized to facilitate the connection of different components and devices. TB1 houses critical elements like TTL pulse rate pickups, voltage detection, E-STOP, and the breaker relay, whereas TB2 is designated specifically for passive pulse rate pickups.
  • Wire Size Compatibility: The terminal blocks accommodate wires of up to #12 AWG size, allowing for a versatile range of wire thicknesses for different components.
  • Secure Mounting: The terminal blocks are securely mounted using two screws, ensuring stability and reliability in the connections made within the system.
  • Grounding Consideration: The shield termination strip attached to chassis ground serves the purpose of grounding, which is crucial for safety and proper functioning of the system, minimizing interference and ensuring stability in operation.

System Design and Board Functionality

The TRPA is ingeniously designed to serve distinct operational modes, offering versatile application capabilities catering to varied configurations. Its functionality and connections depend on the utilization of specific terminal boards and input/output (I/O) packs within the system architecture.

Dual Application Modes:

  • TTUR Terminal Board Integration: In scenarios where a TTUR terminal board accommodates three PTUR I/O packs, the TRPA terminal board is connected using three cables featuring DC-37 pin connectors at both ends. This mode of operation triggers specific functionalities within the TRPA board.
  • Functionality in This Configuration: Voted Trip Relay Outputs: The TRPA, in this configuration, provides two contact voted trip relay outputs, alongside an ESTOP (emergency stop) function, essential for safety measures.
  • Voltage Sensors: Additionally, the TRPA facilitates four voltage sensors, enhancing monitoring and control capabilities within the system.

Exclusions in Speed Inputs:

  • It's important to note that within this specific board arrangement, the TRPA's speed inputs remain inactive and should not be linked or connected.
  • Specialized Features of TTUR Terminal Board: Meanwhile, the TTUR terminal board retains its standard set of features and functionalities, as previously described for that specific board.
  • This dual-application capability of the TRPA board offers tailored functionalities and connections based on the integration of specific terminal boards and I/O packs.
  • Understanding these modes ensures optimized utilization of the TRPA board within the system architecture while maintaining proper functionalities and safety protocols.

Voltage Monitors

  • The board presents a versatile feature allowing trip relays to be placed anywhere within a trip string, complemented by four adaptable isolated voltage sensor inputs. These inputs serve as multi-functional monitoring points across the trip system, providing the flexibility to observe various crucial points.
  • Their primary function involves feeding voltage statuses into the system controller, enabling swift actions based on real-time information. Commonly, these inputs are utilized to gauge power supply voltages for the two trip strings and to detect solenoid voltages of the devices controlled by the relays.
  • Although these applications are outlined in the board symbol's description, these sensors can be applied throughout the system according to specific needs for optimal functionality and tailored operation.

The WOC team is always available to help you with your Mark VIe requirements. For more information, please contact WOC.

Frequently Asked Questions

What is IS200TRPAH1AFC?
It is a turbine primary trip terminal board developed by GE under Mark VIe series.

Can trip relays be placed anywhere in the trip string?
Yes, the trip relays can be positioned at any point within the trip string. Their placement is not fixed, offering flexibility in system design and setup.

What are the voltage sensor inputs used for on the TRPA?
Features four general-purpose isolated voltage sensor inputs. These inputs serve the purpose of monitoring various points within the trip system. They can relay voltage statuses to the system controller, enabling the initiation of specific actions based on the received information.

Are the voltage sensors limited to the suggested applications?
No, the sensors on the TRPA are not restricted to specific applications. While the suggested applications provide examples of their usage, these sensors can be freely employed to best cater to the needs of the specific application or system setup.

What benefits does the flexibility of voltage sensor inputs offer?
The adaptability of the voltage sensor inputs allows for customized monitoring and control within the trip system. This flexibility facilitates tailoring the system to specific requirements, enhancing its functionality and responsiveness to various operational conditions.