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The GE IS200EACFG2ABC Exciter AC Feedback Board (EACF) is a specialized printed circuit board used in the GE EX2100 Excitation Control System for synchronous generators.1
Its primary role is to measure and condition high-voltage AC feedback signals from the exciter power system, which is essential for the precise control of the generator’s output voltage and reactive power.2
⚡ G2 Version Specifications
The G2 designation in the part number (IS200EACFG2ABC) indicates the specific, higher voltage range this board is configured to handle compared to the G1 version.3
| 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 signals from Current Transformers (CTs) (Air Core CTs) via dedicated terminals. |
| Flux/Coil Inputs | Includes terminals for two Flux/Air core coils for additional feedback data. |
| Primary Components | Contains four transformers (T1-T4) for three-phase voltage measurement. |
| Controller Interface | Outputs data via three DB9 connectors (J504, J509, J514) to the M1, M2, and C controllers through the EBKP backplane. |
| Signal Integrity | Incorporates high-frequency noise reduction features near the signal entrance points. |
💡 EACF Board Functionality
The board’s core importance lies in its ability to safely scale down the high-power exciter voltage and current for the sensitive control electronics:
- Voltage Measurement: The onboard transformers step down the high AC voltage from the Potential Power Transformer (PPT) to a low-level signal (typically a nominal 1.6 Vrms secondary output) that can be processed by the digital controllers.4
- Closed-Loop Control: The accurate, real-time AC voltage and current feedback allows the EX2100 system to perform precise closed-loop control of the SCR firing circuits (the exciter bridge), ensuring the generator’s stability, reliability, and proper synchronization with the grid.5
- Installation: The EACF board is typically mounted in the exciter auxiliary cabinet and connects to the EBKP backplane via the DB9 connectors.6
The IS200EACFG2ABC is designed to maintain signal integrity over long cable runs (up to 90 meters) between the board and the main controllers.7
