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The GE IS200EACFG2AAA Exciter AC Feedback Board (EACF) is a specialized printed circuit board used exclusively in the GE EX2100 Excitation Control System for large synchronous generators.1
Its primary function is to measure and condition high-voltage AC feedback signals from the exciter power system, providing critical data to the control system for precise regulation of the generator’s output voltage and reactive power.2
⚡ Key Technical Specifications (G2 Version)
The distinguishing feature of the G2 version (indicated by the G2 in the part number) is its designed voltage range, making it suitable for higher power excitation systems.3
| Feature | Details |
| System | GE EX2100 Excitation Control System (part of the Mark VI series) |
| Function | Exciter AC Voltage and Current Feedback |
| Nominal Voltage Range | Up to 1000 V rms (+20%) at 50/60 Hz. |
| Input Signals | Single three-phase input voltage from the exciter Potential Power Transformer (PPT) and current feedback. |
| Transformers | Contains four transformers (T1-T4) used for three-phase voltage measurement. |
| Coil Inputs | Includes terminals for two Flux/Air core coils, providing additional feedback signals. |
| Processor Interface | Outputs voltage and current data via three DB9 connectors (J504, J509, J514) for cabling to the main controllers (M1, M2, and C) through the EBKP backplane. |
| Signal Integrity | Features high-frequency noise reduction near the signal entrance point. |
💡 G1 vs. G2 Voltage Difference
The G2 version is physically similar to the G1 version but is rated for significantly higher voltage input:4
- IS200EACFG1 (G1 Version): Rated for nominal AC input voltages up to 480 V rms.5
- IS200EACFG2 (G2 Version): Rated for nominal AC input voltages up to 1000 V rms.6
The accurate, high-voltage feedback provided by the EACF board is fundamental to the closed-loop control of the exciter bridge (SCR firing), ensuring the generator’s stability and reliability on the electrical grid.7
