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The GE IS200EACFG2BAA Exciter AC Feedback Board (EACF) is a specialized Printed Circuit Board (PCB) used in the GE EX2100 Excitation Control System for synchronous generators.1
Its primary function is to measure and condition high-voltage Alternating Current (AC) feedback signals from the exciter power system, providing critical data to the main controllers for precise regulation of the generator’s output voltage and reactive power.2
⚡ G2 Version Specifications
The G2 designation in the part number (IS200EACFG2BAA) indicates that this board is configured for a higher voltage range than the G1 version, making it suitable for more powerful excitation systems.
| Feature | Details |
| System | GE EX2100 Excitation Control System (part of the Mark VI Series) |
| Function | Exciter AC Voltage and Current Feedback |
| Input Voltage Rating (G2) | Nominal single three-phase AC input voltage up to 1000 V rms (+20%) at 50/60 Hz. |
| Current Feedback | Accepts current signals, typically from Air Core Current Transformers (CTs), via dedicated terminals. |
| Flux/Coil Inputs | Includes terminals for two Flux/Air core coils for additional magnetic flux feedback data. |
| Primary Components | Contains four transformers (T1-T4) used for three-phase voltage measurement and scaling. |
| Controller Interface | Outputs measured data via three DB9 connectors to the M1, M2, and C controllers through the system’s backplane. |
| Revision | The suffix H2BAA denotes the specific hardware and artwork revisions. |
💡 EACF Board Importance
The EACF board is fundamental to the closed-loop control of the exciter:
- It safely steps down high-power AC voltages and currents using integrated transformers to a low-level signal that the digital controllers can process.
- The accurate, real-time feedback allows the EX2100 system to precisely control the SCR firing circuits (the exciter bridge), which is necessary for stable generator operation and proper interaction with the electrical grid.
