IS200TSVOH2B - Servo Terminal Board

IS200TSVOH2B - Servo Terminal Board IS200TSVOH2B - Servo Terminal Board

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Part No.: IS200TSVOH2B
Manufacturer: General Electric
Series: Mark VI
Size: 17.8 cm high x 33.02 cm wide
Magnetic PR pickup signal: Generates 150 V p-p into 60 K ohms
Active PR Pickup Signa:l Generates 5 to 27 V p-p into 60 K ohms
Technology: Surface mount
Availability: In Stock
Country of Manufacture: United States (USA)

Functional Description

IS200TSVOH2B is a Turbine Servo Terminal Board developed by GE. It is a part of Mark VI control system. The Servo Terminal Board (TSVO) serves as a critical interface component within the system, playing a key role in controlling and monitoring various essential functions, particularly those related to steam and fuel valve actuation. It is responsible for interfacing with two electro-hydraulic servo valves. These servo valves are instrumental in precisely controlling the opening and closing of steam and fuel valves within the system. This precise control is vital for maintaining optimal operational conditions and ensuring safety.


  • Valve Position Measurement: To achieve precise control over the valve positions, the TSVO utilizes Linear Variable Differential Transformers (LVDTs). LVDTs are specialized sensors that provide accurate and continuous measurement of valve positions. This measurement data is essential for the feedback control loop, allowing the system to make real-time adjustments as needed.
  • I/O Processor Connection: To facilitate communication and data exchange, the TSVO is connected to the I/O processor (VSVO) via two dedicated cables. These cables are connected using the J5 plug on the front of the VSVO and the J3/4 connectors on the VME rack. This connection allows for seamless data transfer and control signals between the TSVO and the processor, enabling effective coordination of valve control.
  • Signal Distribution: The TSVO serves as a signal distribution hub within the system. It provides Simplex signals through the JR1 connector, ensuring that essential signals are delivered reliably to the intended destinations. Moreover, it fans out Triple Modular Redundant (TMR) signals to multiple connectors, including JR1, JS1, and JT1. This redundancy is crucial for fault tolerance and system reliability, as it allows for backup signals to take over in case of a failure in the primary signal path.
  • External Trip Capability: For added safety and flexibility, the TSVO includes plugs JD1 or JD2, which are designated for external trip signals originating from the protection module. These external trip signals can serve as emergency shutdown mechanisms, ensuring that the system can quickly respond to critical situations and minimize risks.


  • Wiring to I/O Terminal Blocks: Sensors and servo valves are directly connected to two I/O terminal blocks, which are securely mounted on the terminal board. These terminal blocks play a pivotal role in facilitating the electrical connections required for the proper operation of the system. To ensure stability, each terminal block is firmly secured in place using two screws.
  • Terminal Block Capacity: Each of these I/O terminal blocks is equipped with a total of 24 terminals, providing ample connectivity options. These terminals are designed to accept wiring as large as #12 AWG, ensuring that the system can accommodate a range of wire sizes as needed for different components.
  • Shield Termination Strip: Located immediately to the left of each terminal block is a shield termination strip that is firmly attached to chassis ground. This strip serves the important function of providing electromagnetic shielding and grounding for the connected components. This is crucial for minimizing electrical interference and ensuring the integrity of the system's signals.
  • External Trip Wiring: The system offers the flexibility to accommodate external trip wiring, which can be plugged into either JD1 or JD2 connectors. These connectors are strategically positioned to facilitate quick and reliable external trip inputs. This feature enhances the system's safety by allowing for rapid response to emergency situations.
  • TMR Configuration for Servo Outputs: Each servo output is configured for Triple Modular Redundancy (TMR), a critical redundancy strategy to ensure system reliability. In TMR configuration, each servo output can have three coils, providing backup options in case of component failure.
  • Coil Current Selection: To fine-tune the operation of the servo outputs, the system utilizes jumper selections. These jumpers, labeled as JP1-6, allow for the selection and adjustment of coil currents. This flexibility enables precise control and optimization of the servo valves to meet the specific requirements of the system.


In a simplex system configuration, the setup involves configuring Servo 1 and Servo 2 for optimal performance and functionality. Jumper settings play a crucial role in determining the correct coil current for each servo output.

  • Simplex System Configuration:
    • Servo 1 Configuration: Jumper JP1 facilitates the configuration of Servo 1 by selecting the appropriate coil current. The Servo Coil Ratings table provides detailed specifications for this configuration.
    • Servo 2 Configuration: Jumper JP4 is utilized to configure Servo 2, ensuring the correct coil current alignment.
    • TMR System Configuration: In a Triple Modular Redundancy (TMR) system, redundancy and fault tolerance are key priorities. Each servo output within the TMR system can accommodate three coils, offering enhanced reliability and redundancy.
  • Servo Configuration in TMR System:
    • For Servo 1: Coil currents for each of the three coils are individually selected using jumpers JP1 through JP3.
    • For Servo 2: Similar configuration is applied, with coil currents determined by jumpers JP4 through JP6.
  • All additional configuration settings for the servo boards are managed through the toolbox interface, ensuring comprehensive control and customization options.

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

Frequently Asked Questions


What is IS200TSVOH2B?
It is an Turbine Servo Terminal Board developed by GE

What is the role of the servo board in the system, and what are its primary functions?
The servo board plays a vital role in the system, providing four channels that include bi-directional servo current outputs, LVDT position feedback, LVDT excitation, and pulse rate flow inputs. It's responsible for precise control and monitoring of critical system components.

How many LVDT valve position inputs can the TSVO accommodate?
The TSVO can provide excitation for and accept inputs from up to six LVDT valve position sensors. This flexibility allows for comprehensive monitoring and control of valve positions within the system.

Can you explain the options for the number of LVDTs used in each servo control loop?
Certainly. The system provides the flexibility to choose between one, two, three, or four LVDTs for each servo control loop. This adaptability allows the system to be tailored to specific requirements and applications.

What is the significance of using three LVDT inputs in particular?
When three LVDT inputs are utilized, they are available for gas turbine flow measuring applications. These signals pass through the TSVO and are directly routed to the VSVO board's front at connector J5. This feature streamlines the integration of flow measuring functions into the system.