IS200EDEXG1B | General Electric | Exciter De-Excitation Control Board

GE IS200EDEXG1B Exciter De‑Excitation Control Board

Configured for SCR‑based de‑excitation in EX2100e exciter systems, the GE IS200EDEXG1B (IS200EDEXG1B De‑Excitation Control Board) provides controlled removal of generator‑field stored energy during emergency shutdowns, using firing circuits, conduction sensing, and voltage hold‑up paths.

Suffix Breakdown & Model Matrix

The documentation does not define any suffix variants or sub‑models for IS200EDEXG1B. The board is treated as a single, fixed configuration within the EX2100e de‑excitation module family.

Hardware Specifications

Triple Modular Redundancy (TMR) 2oo3 Architecture

As a GE protection‑class module, the IS200EDEXG1B aligns with deterministic exciter‑level timing and supports triple modular redundancy across EX2100e shutdown logic. SCR firing commands are voted using a 2oo3 scheme, ensuring that no single failure can inhibit de‑excitation. The board’s conduction‑sense feedback is galvanically isolated through Hall‑effect sensors, supporting galvanic isolation between field circuits and control electronics. During power‑loss events, the voltage hold‑up path ensures fail‑safe state execution by maintaining firing capability until stored field energy is fully removed.

Frequently Asked Questions

Q: How many male pin connectors are present on the IS200EDEXG1B? A: The board includes two vertical male pin connectors.

Q: Does the board require calibration after installation? A: No calibration parameters are defined. SCR firing and conduction sensing operate as fixed‑function circuits.

Q: How does the board detect field current? A: Hall‑effect sensors coupled through a mechanical flux ring detect bi‑polar or uni‑directional current depending on SCR or diode de‑excitation mode.

Field Installation Guidelines

• De‑energize all exciter circuits before handling the board.
• Label all cables prior to removal to ensure correct reconnection.
• Remove the conduction ring carefully; reinstall a new ring during replacement.
• Verify jumper positions (JP1, JP6) match the original board before energizing.
• Ensure the firing‑control circuit is functional before applying break‑over voltage to BOD networks.
• Use insulated tools when accessing connectors or jumpers to avoid accidental shorts.