SPECIFICATIONS
Part No.: IS215VPROH1BE
Manufacturer: General Electric
Country of Manufacture: United States of America (USA)
Number of Inputs: 4 - 20 mA
Number of Outputs: 6
Power Supply Voltage: 125 V dc
Thermocouple types: E, J, K, S, T
Span: -8 mV to +45 mV
Common Mode Voltage Range: ±5 V
Dimensions: 16.51 cm High x 17.8 cm
Operating temperature: 30 to 60 °C
No.of Analog Voltage Inputs: 6
Product Type: Turbine Protection Board
Availability: In Stock
Series: Mark VI
Functional Description
IS215VPROH1BE is a Turbine Protection 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 various industrial applications, particularly 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 Valve Control: Supports control for up to four electro-hydraulic servo valves. These valves modulate the flow of steam or fuel via system control valves, impacting turbine behavior and overall process performance. Accurate control of these actuators is essential for maintaining target pressure, flow, and thermal parameters.
- Position Sensing via LVDTs: The board integrates Linear Variable Differential Transformers (LVDTs) for closed-loop position feedback. LVDTs are electromechanical sensors that provide continuous, high-precision valve stem position data by converting linear displacement into an analog electrical signal. This feedback enables precise monitoring and ensures the actuator remains within specified operational tolerances.
- Position Loop Control Algorithm: An embedded position loop control algorithm forms the core of the board's closed-loop operation. This algorithm continuously interprets LVDT input data and adjusts servo output in real time to achieve and maintain target valve positions. The algorithm is designed to minimize deviation, improve control accuracy, and adapt to dynamic process conditions.
- Hardware-Based Current Regulation: To ensure consistent actuation performance, the board incorporates a hardware current regulator. This component stabilizes the output current delivered to the servo valves, mitigating the impact of supply fluctuations or load variations. Consistent current regulation is vital for reliable and repeatable valve movements, directly contributing to overall control system integrity and operational longevity.
Connectivity
- The board provides multiple interfaces for communication and integration within the Mark VI control system. On the front panel, a J5 connector is used to facilitate communication with external systems or supervisory components. One of the three primary board cables interfaces through the J5 plug, supporting real-time data exchange and enabling external monitoring or control functionalities. This interface plays a critical role in integrating the servo control subsystem into broader plant automation and control architectures.
- Two additional cables interface with the J3 and J4 connectors located on the backplane. These connections serve as internal communication links, allowing the VSVO board to interface directly with other Mark VI system components. Through these pathways, the board participates in synchronized data exchange and command execution across the control system, ensuring coherent and coordinated system behavior.
Terminal Boards
- Supports four independent servo valve control channels. These are interfaced via two types of terminal boards: TSVO (Terminal Servo Valve Output) and DSVO (Dual Servo Valve Output).
- TSVO Boards: The TSVO terminal board functions as the output interface for the VSVO board, transmitting the final control signals to the electro-hydraulic servo valves based on command inputs and system feedback.
- DSVO Boards: In configurations requiring dual-channel output capability, DSVO terminal boards may be used to support higher density or redundancy in servo control paths.
- Each VSVO board can be connected to up to two TSVO terminal boards, allowing it to manage multiple servo output channels. Conversely, each TSVO board can interface with up to three VSVO boards, enabling scalable configurations suited to larger or more complex systems. This modular approach enhances system flexibility, making it easier to expand or adapt the control infrastructure by evolving operational requirements.
Installation Procedure
1. Insertion into VME I/O Rack
Carefully insert the board into its designated slot within the VME-based I/O processor rack. Align the board accurately with the guide rails to ensure proper mechanical and electrical engagement. Once aligned, apply even pressure using both hands to engage the top and bottom insertion levers. This action ensures the board’s edge connectors are fully seated in the backplane, establishing critical electrical connections with the rack infrastructure.
2. Securing the Board
Once the board is seated, secure it mechanically by fastening the captive screws located on the upper and lower sections of the front panel. These screws prevent mechanical movement and ensure continued contact with the backplane connectors. Tighten the screws until snug; avoid excessive torque to prevent potential damage to the board or rack assembly.
3. Power-Up and Verification
After installation, apply power to the VME rack. Upon energization, the board will initiate its startup sequence, including self-diagnostic checks. Observe the diagnostic LEDs located on the top section of the board’s front panel. These indicators provide real-time status information regarding board functionality and connectivity.
- A normal indication typically includes green or steady-state lights.
- Any fault or abnormal indication (e.g., flashing or red LEDs) should prompt immediate verification of physical connections and board seating.
- If any discrepancies are observed, de-energize the rack and repeat the above installation steps to verify correct alignment and secure connection.
Operation
- It safeguards the turbine from overspeed conditions. It does so by continuously monitoring turbine speed and providing immediate shutdown if the turbine exceeds predefined speed thresholds. This function is essential for preventing damage to the turbine due to excessive rotational speeds, which could otherwise lead to severe mechanical stress and failure.
- In addition to overspeed protection, the VPRO board is equipped with backup synchronization check protection. This feature ensures that the turbine's synchronization with the grid or other power systems remains within safe operating parameters. If synchronization is lost or if there is a discrepancy, the VPRO board can trigger a shutdown or corrective action, protecting the system from potential damage caused by unsynchronized operations.
- The board is designed to handle three analog current inputs. These inputs provide real-time monitoring of various electrical parameters in the system, such as current flow in critical components. These readings help ensure that the system operates within normal limits, and any deviations can be flagged for corrective action.
- The board is equipped with nine thermocouple inputs, which are primarily intended for exhaust over-temperature protection in gas turbines. These inputs measure the temperature of the exhaust gases, a critical parameter for ensuring the turbine's safe operation. If the exhaust temperature exceeds predefined thresholds, the VPRO board can trigger an alarm or initiate a shutdown sequence to prevent overheating, which could lead to component damage or failure.
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 IS215VPROH1BE?
It is a Turbine Protection Board developed by GE under the Mark VI series.
How does the board protect the turbine from overspeed?
The board continuously monitors the turbine’s rotational speed. If the turbine exceeds predefined speed limits, the board activates an emergency shutdown to prevent damage due to excessive speed.
What is the role of the analog current inputs on the board?
The three analog current inputs on the board monitor critical electrical parameters within the turbine system, such as current flow. These readings help detect anomalies and ensure that the system operates within safe electrical limits.
What are thermocouple inputs used for in the board?
The board includes nine thermocouple inputs to monitor exhaust temperatures in gas turbines. These inputs provide crucial temperature data, and if the exhaust temperature exceeds safe limits, the board can initiate an alarm or shutdown to prevent overheating.
How many VPRO boards are typically required for turbine protection?
The protection system typically requires three VPRO boards to ensure complete emergency overspeed protection and other safety functions, such as synchronization checks and temperature monitoring.
