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The GE IS200GGXDG1A Expander Diode Source Board (GGXD) is a specialized printed circuit board used in General Electric’s Mark VI Speedtronic Turbine Control System.
Its primary role is to serve as an interface and feedback collector for the high-power excitation or dynamic braking circuitry, particularly those involving diode sources.
⚙️ Core Functions
The GGXD board performs critical interfacing and protection functions, particularly between the main control board and power circuits:
- Bridge Interface Feedback: It provides the necessary analog and fiber-optic feedback hardware to interface the BICI board (Bridge Interface Control Board) with a dynamic braking circuit or a diode source circuit.
- Signal Conversion: It facilitates the exchange of gating commands and status signals with the BICI board, often utilizing RS-422 transceivers for robust communication.
- Source Monitoring: It accepts various signals to monitor the health and status of the power source, including:
- Current feedback signals from source current transformers.
- A power supply “OK” signal from the associated GDPA (Gate Driver Power Assembly) board.
- Grounding and Diagnostics: The board features several stab-on connectors used for grounding and includes three LED indicators to assist with on-site diagnostics for power supply status and other faults.
In essence, the IS200GGXDG1A acts as a crucial link that allows the Mark VI controller to accurately monitor and control the high-power section of a drive or excitation system that incorporates a dynamic braking or diode source.
