SPECIFICATIONS
Part No.: IS200VSVOH1BDB
Manufacturer: General Electric
Country of Manufacture: United States of America (USA)
Magnetic PR pickup signal: Generates 150 V p-p
Active PR Pickup Signal: Generates 5 to 27 V p-p into
Size: 17.8 cm high x 33.02 cm wide (7 in. x 13 in.)
Power supply voltage: nominal 15 V dc
Product Type: Servo Control Board
Availability: In Stock
Series: Mark VI
Functional Description
IS200VSVOH1BDB is a Servo Control Board developed by GE. It is a part of Mark VI control system. This board controls the operation of electro-hydraulic servo valves, which are responsible for actuating steam and fuel valves in power generation systems. The VSVO (Servo Control) Board is a key component in ensuring precise control, monitoring, and regulation of valve positions, which is essential for optimal system performance and efficiency.
Components and Functions
- Electro-Hydraulic Servo Valves: The board is tasked with controlling four electro-hydraulic servo valves. These valves regulate the flow of steam or fuel through the system's control valves, directly influencing the operation of critical equipment such as turbines. The precise control of these valves is essential for maintaining the correct pressure, temperature, and flow rates, which are necessary for safe and efficient system operation.
- Linear Variable Differential Transformers (LVDT): For accurate valve position measurement, incorporates Linear Variable Differential Transformers (LVDT). LVDTs are highly precise sensors used to measure the position of the valve stems. These sensors convert mechanical movement into an electrical signal, allowing the system to continuously monitor the position of the valves. This feedback is essential for maintaining accurate control and ensuring the valves are operating within their specified parameters.
- Position Loop Control Algorithm: A key feature of the VSVO board is its integration of a position loop control algorithm within its firmware. This algorithm is responsible for dynamically adjusting the position of the servo valves to ensure optimal performance. It continuously processes input from the LVDTs and adjusts the servo valve position accordingly to maintain precise control over the system. By adjusting the servo output in real time, the system can compensate for any deviations, ensuring consistent performance and minimizing errors.
- Hardware Current Regulator: Includes a hardware current regulator designed to maintain stable servo output current. This regulator ensures the system delivers a consistent, reliable current to the servo valves, which is essential for proper valve actuation. By maintaining a stable current, the system avoids fluctuations that could result in inaccurate valve positioning or unstable operations. This component enhances the overall reliability and longevity of the servo control system.
Connectivity
- Front Panel (J5 Plug): The front panel of the board is equipped with a J5 plug, which allows for communication with external systems or components. One of the three cables connecting to the board is routed to this plug, enabling data exchange and facilitating external monitoring or control. This connectivity is important for integrating the servo control system into larger control architectures and enabling real-time communication with other system components.
- Backplane Connections (J3 and J4 Connectors): The board features two additional cables that connect to the J3 and J4 connectors on the backplane. These connectors provide the internal communication pathways between the VSVO board and other components within the Mark VI control system. Through these connections, the board integrates seamlessly into the larger control infrastructure, enabling synchronized operation with other systems and components.
Terminal Boards
- TSVO (Terminal Servo Valve Output): The board controls four servo valve channels, and these channels are divided between two types of terminal boards: TSVO (Terminal Servo Valve Output) and DSVO (Dual Servo Valve Output). The TSVO board connects to the VSVO board and facilitates the final output signal sent to the servo valves, controlling their operation based on the feedback from the system.
- Connection Flexibility: The design of the board allows for flexible system configuration. Each VSVO board can be connected to two TSVO terminal boards, which expands the ability to control multiple channels. Furthermore, each TSVO terminal board can accommodate connections from up to three VSVO boards, enabling scalable and adaptable system configurations. This flexibility is especially important in complex systems that require multiple control channels or the ability to expand the control infrastructure as the system needs to evolve.
Signal Distribution
- JR1 Connector: TSVO terminal boards provide simplex signals through the JR1 connector, enabling straightforward signal transmission within the system.
- TMR Signal Distribution: Additionally, TSVO terminal boards fan out TMR (Triple Modular Redundant) signals to the JR1, JS1, and JT1 connectors, ensuring redundancy and fault tolerance.
Fault Detection
- Servo Current Out-of-Limits: One triggering condition for initiating suicide servo outputs is when the servo current exceeds predetermined limits or fails to respond within expected parameters. This safeguard is crucial for preventing potential damage to components or unsafe operating conditions caused by excessive current draw or erratic behavior.
- Overcurrent Protection: When the servo current surpasses predefined thresholds, the system triggers suicide servo outputs as a protective measure. This action helps prevent equipment damage and ensures the system operates within safe operating parameters.
- Current Responsiveness Monitoring: Additionally, if the servo fails to respond appropriately to control signals or exhibits erratic behavior indicative of malfunction, the system activates suicide servo outputs to mitigate potential risks and maintain operational stability.
- Regulator Feedback Signal Abnormalities: Another triggering condition for initiating suicide servo outputs is the detection of abnormalities in the regulator feedback signal. This signal serves as a crucial indicator of the system's performance and stability, making deviations from expected limits a cause for concern.
- Feedback Signal Monitoring: The system continuously monitors the regulator feedback signal to detect any anomalies or deviations from normal operation. If the signal exceeds predetermined limits or displays irregular behavior, indicating potential issues with the servo control loop, suicide servo outputs are activated to prevent further complications.
- Safety Precautions: By activating suicide servo outputs in response to abnormal feedback signals, the system ensures that any potential risks or malfunctions are promptly addressed, safeguarding equipment and personnel from harm.
The WOC team is always available to help you with your Mark VI requirements. For more information, please contact WOC.
Frequently Asked Questions
What is IS200VSVOH1BDB?
It is a Servo Control Board developed by GE under the Mark VI series.
What do the LEDs at the top of the front panel indicate?
The LEDs at the top of the front panel provide status information about the board's operation.
What is the normal condition for the RUN LED?
In normal operating conditions, the LED flashes green, indicating that the VSVO board is functioning correctly and actively controlling the servo valves.
How is a failure condition indicated on the front panel?
A failure condition is indicated by the FAIL LED, which emits a solid red light when a malfunction or fault is detected within the board.
