IS210TRPSH1A - Trip Output Terminal Board Assembly

IS210TRPSH1A - Trip Output Terminal Board Assembly IS210TRPSH1A - Trip Output Terminal Board Assembly

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Part Number: IS210TRPSH1A
Manufacturer: General Electric
Series: Mark VI
Product Type: Trip Output Terminal Board Assembly
Repair: 3-5 days
Trip solenoids 3 solenoids
Current suppression MOVs
Availability: In Stock
Country of Manufacturer: United States (USA)

Functional Description

IS210TRPSH1A is a Steam Primary Protection Trip Output Terminal Board Assembly developed by General Electrics. It is a part of Mark VI control system. The terminal board plays a crucial role in safeguarding small and medium-sized steam turbines through primary overspeed protection measures. It's an integral part of the safety system and works in conjunction with other components to ensure the turbine's safe operation. It interfaces with trip solenoids, employs a voting system for reliability, and works in conjunction with the TRES terminal board to ensure safe turbine operation. Its design and functionality are tailored to the specific requirements of steam turbine applications, emphasizing overspeed protection and safety.


  • Primary Overspeed Protection: The primary purpose of the TRPS terminal board is to provide primary overspeed protection for steam turbines. This protection is vital to prevent potentially catastrophic overspeed conditions that can lead to equipment damage or even accidents.
  • Control by Turbine I/O Controller: TRPS is under the control of the turbine's Input/Output (I/O) controller. The controller manages and coordinates the operation of TRPS, ensuring it responds promptly to any overspeed conditions or emergencies.
  • Interface with Trip Solenoids (ETD): TRPS is equipped with three magnetic relays that interface with three trip solenoids, known as Electrical Trip Devices (ETD). These solenoids are responsible for initiating emergency shutdowns or other critical actions when an overspeed condition is detected.
  • TRES and Interface to ETDs: To facilitate its functions, TRPS works in conjunction with the TRES terminal board. Together, they form the primary and emergency sides of the interface to the ETDs. This interface is crucial for ensuring a robust and reliable connection to the trip solenoids.
  • Voting System: TRPS employs a two-out-of-three voting system to enhance reliability. Unlike TRPG and TRPL, which use relay contacts for voting, TRPS performs this function in the relay drivers. This voting mechanism ensures that multiple signals must concur before initiating a trip, reducing the chances of false alarms or erroneous shutdowns.
  • Simplex Application: In simplex applications, where redundancy is not required, the voting mechanism is bypassed. Instead, the relay drivers are controlled by a single signal from JA1. This simplifies the control system while still maintaining overspeed protection.
  • No Economizing Relays: Unlike some other systems, TRPS does not incorporate economizing relays. Economizing relays are typically used to optimize the operation of protective devices but are not present in this configuration.
  • No Flame Detector Inputs: In contrast to certain systems designed for gas turbine applications, TRPS does not include inputs for flame detectors. Flame detectors are typically used in gas turbine applications to detect the presence of flames and initiate protective actions if necessary.
  • Positive and Negative Power Supply: Similar to TREG and TRPG in gas turbine applications, TRES provides the positive side of the 125 V DC power to the trip solenoids, while TRPS provides the negative side. This dual-sided power supply is essential for the reliable operation of the trip solenoids.
  • Manual Emergency Stop Functions: TRPS offers provisions for wiring in two manual emergency stop functions. These functions allow for human intervention in case of an emergency or when it's necessary to halt the turbine's operation immediately.


  • The installation of trip solenoids and emergency stop controls is a critical step in ensuring the proper and safe operation of a system, particularly in situations where safety measures such as emergency stops and trip solenoids are essential. 
  • Trip Solenoids Placement: The first step in the installation process involves wiring the three trip solenoids. These solenoids are typically positioned in a strategic manner to respond to specific conditions or events that necessitate an emergency shutdown. They are connected to the first Input/Output (I/O) terminal block, which serves as the central connection point for these essential components.
  • Emergency Stop Controls: The second terminal block is designated for the primary emergency stop and, optionally, a secondary emergency stop function. These emergency stop controls are crucial for immediately halting the operation of the system in the event of an emergency or when it's necessary to bring the system to a complete stop to prevent potential hazards.
  • Trip Solenoid Power Supply: To power the trip solenoids, power is supplied through plugs labeled JP1, JP2, and JP3. These plugs serve as the electrical interfaces through which the necessary electrical power is delivered to the solenoids. Properly connecting the power supply is vital to ensure that the solenoids can operate effectively when triggered.
  • Secondary Emergency Stop Wiring: If a secondary emergency stop function is required, specific wiring is needed. The wiring for this secondary emergency stop is connected to terminals 46 and 47 on the terminal block. Additionally, a jumper may be present, which is typically used to bridge or connect certain terminals. In the case of adding a secondary emergency stop, the jumper must be removed to allow the independent wiring of this secondary control function.
  • It's important to note that the installation of trip solenoids and emergency stop controls should be carried out in strict accordance with manufacturer guidelines, industry standards, and safety regulations. This ensures that the system operates reliably and, most importantly, can respond effectively to critical situations to prevent accidents or equipment damage.
  • Thorough testing and validation should follow the installation to confirm that all components are functioning correctly and that the emergency stop controls and trip solenoids are responsive to their designated signals. Regular maintenance and inspections should also be scheduled to ensure that the safety measures remain in optimal working condition throughout the system's operational life.


  • Versatility in Applications: TRPS is a versatile component designed for use in both TMR and simplex configurations. It can adapt to different operational scenarios based on system requirements.
  • Power Distribution: To power the various components, TRPS receives power from three distinct power buses labeled as PwrA, PwrB, and PwrC. These power buses are connected to TRPS through connectors JP1, JP2, and JP3. The power is subsequently distributed to TRES through connector J2.
  • Voltage Range: The power buses are designed to work within a nominal voltage range of 125 V DC, which can vary from 70 to 145 V DC, or alternatively, 24 V DC within a range of 18 to 32 V DC. This flexibility allows TRPS to operate effectively under different voltage conditions.
  • Power Bus Monitoring: TRPS incorporates power bus monitoring for all three buses, ensuring that the power supply remains within specified voltage limits. This monitoring function helps maintain the stability of the system.
  • Current Limit: Each power bus has a maximum current capacity of 3 A, ensuring that the electrical load does not exceed safe limits.
  • Relay Driver Control: The operation of each of the three trip solenoids is facilitated by a dedicated relay driver. These relay drivers play a pivotal role in controlling the solenoids and ensuring their precise operation when required.
  • Relay Output Specifications: The relay output ratings are specified for different operating conditions:
    • At 24 V DC: The relay can handle 3 A of current with a response time (L/R) of 100 ms. It includes suppression measures to manage electrical noise.
    • At 125 V DC: The relay is rated for 1.0 A of current with a response time (L/R) of 100 ms. Similar to the 24 V DC rating, it also incorporates suppression for noise control.
  • Trip Circuits: TRPS includes trip circuits that feature solenoid suppression. This means that when the solenoids are triggered, mechanisms are in place to suppress electrical noise generated during their operation. Additionally, there is monitoring for both solenoid voltage and trip relay contact to ensure they function as intended.
  • Hardwired Trip (E-Stop) and Monitoring: The TRPS board includes a hardwired trip (emergency stop) function that provides approximately 6.6 V DC to the I/O board when the K4 relays are engaged. This function serves as a critical safety measure to immediately halt the system in emergency situations.

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What is IS210TRPSH1A?
It is a Trip Output Terminal Board Assembly developed by General Electrics.

What is the role of the I/O controller in TRPS diagnostics?
The I/O controller is responsible for running diagnostics on the TRPS. It assesses various signals and parameters to ensure the system's health and readiness.

What specific diagnostics does the I/O controller perform?
The I/O controller conducts diagnostics that include feedback from the trip solenoid relay driver and contact, monitoring of solenoid voltage, and checks on the solenoid power bus. These tests aim to verify that all critical components are functioning within specified limits.

Why are these diagnostics important for operation?
These diagnostics are essential to ensure that TRPS is in optimal working condition. By continuously monitoring key parameters, the system can detect any abnormalities or faults that might compromise its reliability or safety.

How are connectors J00, JR1, JS1, and JT1 related to hardware compatibility?
These connectors on the terminal board have their own identification (ID) devices. The I/O controller interrogates these ID devices to confirm hardware compatibility and proper connections.