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The GE IS200SSVPH2A is a Simplex Servo Terminal Board for the GE Mark VIe (MKVIe) turbine control system. Its main function is to provide a dedicated, non-redundant interface for servo valves, which are crucial for precisely controlling the flow of steam to the turbine.
Function and Purpose ⚙️
The IS200SSVPH2A acts as the crucial link between the MKVIe’s main processor and the turbine’s hydraulic servo valves. These servo valves are responsible for controlling the position of the steam admission and extraction valves, which in turn directly regulate the turbine’s speed and load.
The board provides a secure connection for the wiring from the servo valves. More importantly, it contains circuitry that conditions the feedback signals (e.g., LVDT signals for valve position) from the servo valves and sends them to the control processor. The processor then uses this feedback to generate precise control signals, which are sent back to the board to drive the servo valves. This forms a closed-loop control system, ensuring the accurate and stable control of the turbine. The “Simplex” designation indicates that this board is used in applications where a single, non-redundant channel for servo valve control is sufficient.
Related Components
The IS200SSVPH2A works in conjunction with other components of the Mark VIe system:
- Servo I/O Packs: These electronic modules, such as the IS200SSV, mount directly on the terminal board and contain the active electronics for processing the servo valve signals.
- Processor Cards: The main CPU of the system reads the valve position data from the I/O packs and sends precise commands back to control the valves.
- LVDTs (Linear Variable Differential Transformers): These sensors are mounted on the servo valves and provide the position feedback signal that the IS200SSVPH2A receives.
