IS200TSVOH1A - Servo Terminal Board

SPECIFICATIONS

Part No.: IS200TSVOH1A
Manufacturer: General Electric
Product Type: PCB
Country of Manufacture: United States (USA)
Size: 17.8 cm high x 33.02 cm wide
Technology: Surface mount
Power supply: voltage Nominal 24 V dc
Function: Servo Terminal Board
Series: Mark VI

Functional Description

IS200TSVOH1A is a servo terminal board developed by GE. It is a part of Mark VI excitation system. The Servo Terminal Board (TSVO) serves as a crucial interface within the control architecture, connecting seamlessly to two electro-hydraulic servo valves responsible for actuating steam/fuel valves. The precision in valve positioning is achieved through the utilization of Linear Variable Differential Transformers (LVDT), ensuring accurate and responsive control over the steam and fuel flow within the system.

Valve Position Measurement with LVDT

The incorporation of LVDTs is instrumental in monitoring the position of the valves. These sensors provide real-time feedback on the valve positions, contributing to the overall precision and stability of the control system. The data from LVDTs is pivotal in maintaining the desired operational parameters and ensuring optimal performance.

I/O Processor Connectivity

To establish communication with the Input/Output (I/O) processor (VSVO), two cables are utilized, connecting to the J5 plug on the front of the VSVO and the J3/4 connectors on the VME rack. This configuration ensures a reliable and efficient data exchange between the TSVO and the processor, enabling seamless integration into the broader control system.

Signal Distribution

The TSVO exhibits versatility in signal distribution. It provides Simplex signals through the JR1 connector, streamlining the transmission of essential data to specific components within the system. Additionally, for Triple Modular Redundancy (TMR) configurations, the TSVO fans out signals to the JR1, JS1, and JT1 connectors, introducing redundancy and fault tolerance for enhanced system reliability.

External Trip Integration

Plugs JD1 or JD2 on the board are designated for an external trip originating from the protection module. This feature adds an additional layer of safety and responsiveness to the system, allowing for swift and decisive actions in the event of critical conditions that warrant a trip or shutdown.

Installation

• Terminal Block Connection: Sensors and servo valves are directly wired to two I/O terminal blocks positioned on the terminal board. Each terminal block is securely held in place with two screws, providing stability and durability during operation. These terminal blocks offer a total of 24 terminals, accommodating wiring up to 12 AWG. This setup allows for a clean and organized wiring configuration, ensuring optimal connectivity.
• Wire Termination and Grounding: Adjacent to each terminal block, a shield termination strip is strategically located and attached to chassis ground. This placement ensures efficient grounding, reducing electromagnetic interference, and enhancing the overall stability of the system. Proper grounding is crucial for maintaining signal integrity and preventing potential issues arising from electrical noise.
• External Trip Wiring: The board is designed to accommodate external trip wiring, providing an additional layer of safety and functionality. External trip wiring is seamlessly plugged into either JD1 or JD2, offering flexibility based on specific system requirements. This feature allows for the integration of external trip signals originating from the protection module, enhancing the board's responsiveness to critical conditions.
• Secure Fixation: Throughout the installation process, attention is given to secure fixation. The screws holding down the terminal blocks ensure a tight and reliable connection, minimizing the risk of dislodgment or instability during operation. This secure fixation is essential for maintaining consistent and accurate readings from the sensors and precise control over the servo valves.
• Quality Wiring Practices: During the wiring process, adherence to quality practices is paramount. Wiring is carried out meticulously, and the use of appropriate wire gauges (up to 12 AWG) ensures that the system operates within specified parameters. This attention to detail contributes to the reliability and longevity of the board's functionality.

Explanation

• Bi-Directional Servo Current Outputs: Equipped with four channels, and each channel provides bi-directional servo current outputs. This feature allows the board to not only regulate the magnitude but also control the direction of current flow, contributing to the dynamic and responsive nature of the servo-controlled processes.
• LVDT Position Feedback: LVDTs play a critical role in providing accurate and real-time feedback on the position of the valves. The board manages up to six LVDT valve position inputs, offering flexibility in configuring the number of LVDTs for each servo control loop. This adaptability ensures precise monitoring and control over valve positions, contributing to the overall stability of the system.
• LVDT Excitation: TSVO not only accepts inputs from LVDTs but also provides excitation for these sensors. LVDT excitation is a crucial element in ensuring the optimal performance of these position sensors. This bidirectional communication between the board and LVDTs enables a comprehensive and synchronized operation.
• Pulse Rate Flow Inputs: Pulse rate flow inputs add another layer of functionality. This feature allows the board to receive and process pulse rate inputs, contributing to flow measurement applications. The versatility in handling pulse rate flows enhances the board's utility in a variety of operational scenarios.
• Gas Turbine Flow Measuring Applications:The board offers flexibility in the number of LVDTs used for each servo control loop, presenting a choice of one, two, three, or four LVDTs. In cases where three inputs are utilized, they become available for gas turbine flow measuring applications. These specific signals traverse and are directed straight to the front of the VSVO (I/O Processor) board at J5. This streamlined process ensures efficient communication and data transfer within the control system.

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Frequently Asked Questions

 

What is IS200TSVOH1A?
It is a Servo Terminal Board developed by GE

How is a fault managed when the LVDT feedback signal is out of limits?
In the event of the LVDT feedback signal being out of limits, a fault is created. If the associated regulator employs two sensors, the faulty sensor is excluded from feedback calculations, and the good sensor is utilized to ensure continued precision in position feedback.

What occurs if any of the critical signals become unhealthy?
If any of the signals, such as output servo current or LVDT feedback, become unhealthy, a composite diagnostic alarm labeled L,DIAG VSVO is triggered. This alarm consolidates information on individual diagnostics, and further details can be accessed from the toolbox.

Can diagnostic signals be individually managed?
Yes, the diagnostic signals can be individually latched. Additionally, if they return to a healthy state, they can be reset using the RESET DIA signal. This feature allows for a nuanced approach to managing and resolving diagnostic issues.