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General Electric IS200EACFG1A Exciter AC Feedback Board Item NO.: 2907268

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Product Name	General Electric IS200EACFG1A Exciter AC Feedback Board
Item NO.	2907268
Weight	0.1 kg = 0.2205 lb = 3.5274 oz
Category	GE
Brand	GE
Creation Time	2026-09-11

General Electric

IS200EACFG1A

Exciter AC Feedback Board

EX2100 / Mark VI

AVR Signal Feedback · 480V AC · Simplex/Redundant

Product Overview

The IS200EACFG1A is an Exciter AC Feedback Board (EACF) from GE's EX2100 Excitation Control System. It serves as the high-precision voltage and current signal acquisition unit, responsible for real-time measurement of the exciter Power Potential Transformer (PPT) three-phase AC voltage and current feedback signals.

Unlike signal routing boards, the IS200EACFG1A actively measures and conditions critical analog signals. After isolation and signal conditioning, the data is transmitted to the main controllers (M1/M2/C), forming the core sensing interface for closed-loop excitation regulation and stable output voltage.

The board is essential for interfacing with PT and CT inputs, as well as providing termination for field flashing and de-excitation signals. It supports both Simplex and Redundant configurations, ensuring reliable operation in demanding power generation environments.

Technical Specifications

Parameter	Value
Brand	General Electric (GE)
Model	IS200EACFG1A
Type	Exciter AC Feedback Board (EACF)
Country	United States
Series	EX2100 / Mark VI Excitation Control
Functional Acronym	EACF (Exciter AC Feedback)
Operating Mode	Simplex or Redundant
Rated Input	480 Vrms (±20%), 50/60 Hz
Signal Input	3-Phase PT voltage; 2x air-core CT / flux coil (0-0.8 Vrms)
Output Interface	3x DB9 connectors to M1/M2/C controllers
Isolation	Full input/output isolation, > 2.5kV withstand
Operating Temp	-40°C to +85°C
Weight	Approx. 1.00 kg

Regulator Rack Architecture

How the IS200EACFG1A Interfaces with the Regulator Logic Section

The IS200EACFG1A acts as the signal sensing gateway for the AVR function. It sits between the high-voltage field wiring and the low-voltage control logic, ensuring proper isolation and signal conditioning .

Provides isolation and conditioning for PT voltage inputs used by ACLA and DSPX
Routes analog feedback signals to the ERIO module via EBKP backplane
Interfaces with EPSMG2 for power distribution monitoring
Supports field flashing and de-excitation control signal feedback

Connects to the IS200ERBPG1A via ribbon cable (up to 90m)
Fan-out architecture delivers voltage and flux signals to M1, M2, and C controllers
Supports Simplex Mode for brushless retrofits
Provides high-frequency suppression at flux/air-core entry points

Connector Allocation & Signal Routing

IS200EACFG1A Interface Points

The IS200EACFG1A provides dedicated terminal blocks for field wiring and DB9 connectors for backplane communication. All connections are designed for easy access during maintenance

TB1 — PT input terminal block (Phase A)
TB2 — PT input terminal block (Phase B)
TB3 — PT input terminal block (Phase C)
TB4 — Flux coil / air-core CT input terminal block

J504 — DB9 connector to M1 controller
J509 — DB9 connector to M2 controller
J514 — DB9 connector to C controller
Chassis Ground — Cable shield termination within 3 inches of input screws

FAQ

Our IS200EACFG1A is showing erratic voltage readings on the EX2100. How can we verify if the PT input connections are the issue?

The IS200EACFG1A provides the PT input interface via terminal blocks TB1, TB2, and TB3 for phases A, B, and C respectively. Check that the PT wiring is secure and that there is no oxidation on the terminals. Use the chassis ground screws near the input terminals to verify proper shield termination. If the signal is erratic at the input but stable at the controller, the issue may be in the cable or connector J504/J509/J514. Always ensure all circuits are de-energized before handling the board.

What is the maximum cable length for connecting the IS200EACFG1A to the EBKP backplane?

The IS200EACFG1A connects to the EBKP backplane via the three DB9 connectors. The connection cable from EACF to the EBKP backplane can be up to 90 meters long without signal degradation. This extended length is supported through controlled impedance routing and proper shielding . For installations requiring longer distances, consult GE EX2100 installation guidelines to ensure signal integrity.

We are replacing an IS200EACFG1A in our auxiliary cabinet. What are the steps for safe replacement?

The IS200EACFG1A is mounted inside the Exciter Auxiliary Cabinet. Before replacement, verify all circuits are de-energized. Disconnect all cables from the board (TB1-TB4, J504, J509, J514). Remove the three screws securing the EACF board to the mounting standoffs. Install the new IS200EACFG1A using the same three screws and positions. Reconnect all cables according to labels, ensuring the DB9 connectors are correctly placed to avoid phase mapping errors.

Does the IS200EACFG1A support hot-swap replacement while the system is running?

No, the IS200EACFG1A does not support hot-swap replacement. The board is mounted on standoffs inside the auxiliary cabinet and requires all circuits to be verified de-energized before removal. Attempting to remove or install the IS200EACFG1A while the system is energized can cause electrical hazards and damage to the board or connected controllers.

Our system uses the IS200EACFG1A. Can we replace it with the G2 or G3 version for higher voltage applications?

The IS200EACFG1A (G1) accepts 480 Vrms nominal input, the G2 accepts 1000 Vrms, and the G3 accepts 1300 Vrms (1400 V for revision BAA and later). The G1 version is specifically designed for 480V applications. If your system requires a different voltage level, you would need to use the appropriate G2 or G3 version. However, the G1, G2, and G3 versions are pin-compatible and can be directly replaced if the application voltage is properly matched.

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