IS200EDEXG1AFA |General Electric | Exciter De-Excitation Board

GE IS200EDEXG1AFA Exciter De-Excitation Board

Configured for SCR‑based de‑excitation control in GE Mark VIe excitation networks, the GE IS200EDEXG1AFA (IS200EDEXG1AFA Exciter De‑Excitation Board) provides direct firing‑circuit execution and conduction‑sense feedback for emergency field‑energy removal.

Hardware Specifications

Backplane Bus Communication Velocity Licenses

As part of GE’s Mark VIe excitation platform, the IS200EDEXG1AFA aligns with deterministic backplane timing used for field‑current shutdown. The SCR firing circuit receives redundant commands from the EXTB board, ensuring fixed‑cycle propagation of de‑excitation signals. Firmware flash compatibility resides at the controller and EMIO level; the EDEX board itself performs static electrical functions without programmable logic. I/O density scaling is achieved through coordinated operation with conduction‑sense channels and break‑over diode networks, allowing multiple SCR devices to be fired without altering backplane communication velocity.

Frequently Asked Questions

Q: Can the IS200EDEXG1AFA be inserted or removed under power? A: No. Hot‑swap is not supported due to the risk of unintended SCR gate activation.

Q: Does the board impose additional load on the excitation backplane? A: The board draws power through its firing and hold‑up circuits. Backplane loading remains within standard Mark VIe excitation limits.

Q: How does the conduction‑sense feedback operate? A: Hall‑effect sensors detect field‑current flow through a flux ring, providing bipolar or unidirectional feedback depending on SCR or diode de‑excitation configuration.

Field Installation Guidelines

• Verify that the excitation panel is fully de‑energized before handling the board.
• Maintain correct alignment of the flux ring over the Hall‑effect sensors to ensure accurate conduction feedback.
• Route SCR gate wiring separately from high‑energy field conductors to minimize induced noise.
• Ensure proper seating of connectors between EDEX, EXTB, and EMIO modules.
• Confirm break‑over diode jumper positions before commissioning to avoid over‑voltage conditions at the SCR gate.
• Inspect LED indicators during startup to validate firing‑circuit readiness and conduction‑sense status.