IS200TSVAH1A - Servo Terminal Board

IS200TSVAH1A - Servo Terminal Board IS200TSVAH1A - Servo Terminal Board

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Part No.: IS200TSVAH1A
Manufacturer: General Electric
Series: Mark VI
Technology: Surface mount
Availability: In Stock
Country of Manufacture: United States (USA)

Functional Description

IS200TSVAH1A is an Turbine Servo Terminal Board developed by GE. It is a part of Mark VI control system. The Turbine Servo Terminal Board functions in measuring valve positions using LVDTs. It incorporates two subsystems for this purpose. The subsystem provides four channels, including bi-directional servo current outputs for precise valve movement, LVDT position feedback for real-time monitoring, LVDT excitation to power the LVDT sensors, and pulse rate flow inputs for relevant valve control information. The other subsystem interfaces with up to six LVDT valve position inputs, providing the necessary excitation and enabling simultaneous measurement of multiple valve positions. Together, these functionalities ensure accurate and reliable control over valve positions, contributing to the efficient and safe operation of the turbine system.


  • The board is equipped with sophisticated fault detection capabilities to ensure the proper functioning of the turbine system. It can detect several types of faults.
  • Servo Current Out of Limits or Not Responding: The board monitors the servo current, which is responsible for controlling the position of the turbine components. If the current exceeds safe limits or if there is no response from the servo system, the board can detect and alert the control system of the issue.
  • Regulator Feedback Signal Out of Limits: The regulator feedback signal is crucial for maintaining stable and accurate control of the turbine. If the feedback signal goes beyond predefined limits, it indicates a potential problem with the turbine's regulation, and the board can identify and report this fault.
  • Failed ID Chip: Has an ID chip that communicates critical information about the board's identity and configuration. If the ID chip fails or malfunctions, the board can detect this issue, enabling necessary actions for diagnosis and repair.
  • Magnetic PR Pickup Signal: Interfaces with magnetic PR (Pulse Rate) pickup signals to measure the rotational speed of the turbine. The specifications for the magnetic PR pickup signal are as follows:
    • Generates 150 V peak-to-peak (p-p) into 60 kohms: This signal is utilized for precise speed measurement and monitoring of the turbine's rotational speed.
      Active PR Pickup Signal: Apart from the magnetic PR pickup signal, the board also works with an active PR pickup signal, which serves a similar purpose of measuring turbine speed. The specifications for the active PR pickup signal are as follows:
    • Generates 5 to 27 V peak-to-peak (p-p) into 60 kohms: This signal provides an alternative method for measuring turbine speed and ensuring redundancy in the control system.
      Pulse Rate Input Minimum Signal: Requires specific signal strengths for accurate and reliable turbine speed measurements.
  • The minimum signal strengths required for proper measurements are as follows:
    • At 2 Hz: The minimum pulse rate input signal should be 33 millivolts peak (mVpk). This signal level ensures accurate speed measurements at lower turbine speeds.
    • At 12 kHz: The minimum pulse rate input signal should be 827 millivolts peak (mVpk). This higher signal level is needed to maintain precise speed measurements at higher turbine speeds.


The boards in the system are equipped with special control functions embedded within their firmware. These functions are designed to enhance the system's efficiency and responsiveness by allowing certain processes, like valve position control, to be executed locally on the board itself rather than relying solely on the central controller. This approach offers several advantages, particularly for time-critical operations.

One of the key benefits of utilizing these specialized control functions within the firmware is the ability to achieve rapid and precise responses. For instance, in cases where servo loops are involved, the dedicated servo board can execute these loops at an impressive rate of 200 times per second. This level of speed and responsiveness is essential for maintaining precise control over critical system components. The decision to offload specific control functions to the board level is strategic and serves various purposes:

  • Reduced Latency: By running control loops locally on the board, the system minimizes communication delays between the central controller and the peripheral devices. This reduction in latency is especially vital for processes where even slight delays can have significant consequences.
  • Enhanced Reliability: Distributing control functions across multiple boards increases system redundancy and reliability. If one board or controller were to fail, localized control functions can continue to operate independently, mitigating the risk of system-wide failures.
  • Efficient Resource Allocation: Offloading time-critical functions to dedicated boards allows the central controller to focus on higher-level decision-making and supervisory tasks. This efficient resource allocation optimizes the overall system's performance.
  • Real-time Responsiveness: When dealing with fast-moving or dynamic processes, such as servo control, achieving real-time responsiveness is crucial. Local execution of control functions ensures that the system can react swiftly to changing conditions.

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 IS200TSVAH1A?
It is an Turbine Servo Terminal Board developed by GE

What happens if the regulator feedback signal goes beyond acceptable limits?
If the regulator feedback signal from the LVDT exceeds specified limits, a fault is generated. In cases where the associated regulator employs two sensors for redundancy, the faulty sensor is removed from the feedback calculation, and the good sensor is used to ensure accurate regulation.

Where can I find details about individual diagnostics related to the signals?
The toolbox contains detailed information about individual diagnostics. Operators and maintenance personnel can access this toolbox to investigate and analyze specific faults and health statuses of the signals.

Can the diagnostic signals be latched individually?
Yes, the diagnostic signals from the board can be individually latched. When a diagnostic signal indicates a fault or unhealthy condition, it remains flagged even if the condition later returns to normal. Latching allows for proper investigation and analysis of the issue.