Find It in the Exciter Auxiliary Cabinet, Not the Turbine Control Rack

If you're tracing wiring to locate an IS200EACFG2B, look in the EX2100 exciter auxiliary cabinet, not the Mark VI turbine control VME rack — the two are separate systems that happen to share GE's IS200 part-numbering convention. From there, this board's three-phase voltage and current measurements fan out to three DB9 connectors, cabled to the M1, M2, and C controllers that make up the EX2100's redundant control architecture, and its own connection back to the EBKP backplane board can run as long as 90 meters. Knowing this routing matters when you're troubleshooting: a fault reported against only one of the three controllers often traces back to that specific DB9 cable, not the feedback board driving all three.

What the Board Measures

IS200EACFG2B is the G2 version of GE's Exciter AC Feedback board, built for a nominal 1000 Vrms three-phase input — different from the G1 (roughly 480 Vrms) and G3 (roughly 1300 Vrms) versions of the same board family, which are not interchangeable with this one. It measures the exciter's AC supply voltage, stepped down through onboard potential transformers to a nominal 1.6 V rms signal, and current, sensed through flux/air-core coils with filtering against high-frequency noise, then reports both back to the EX2100 regulator for voltage control.

Don't Assume the Board Failed — Check This First

• Blown potential transformer fuses or damaged field wiring ahead of the board produce the same symptoms as a failed feedback channel.
• Test each DB9 cable to the M1, M2, and C controllers separately — a fault on one controller's feedback path is often a cable or connector issue on that specific run.
• On long cable runs to the EBKP backplane, check cable condition, especially as you approach the 90-meter limit.
• Confirm the board's voltage class (G2, 1000 Vrms) actually matches your exciter before treating a regulation problem as a hardware fault.

Used, Clean and Tested

This unit is sold in cleaned and tested used condition with our standard 1-year warranty. We also stock the G1B version (480 Vrms class) separately — the two boards are not interchangeable, so confirm your exciter's rated voltage before ordering either one.

The Part Number

IS200EACFG2B IS200EACFG2BAA: EACF is the functional code, G2 identifies the 1000 Vrms input class specifically, B marks the board-type revision, and AA tracks the specific hardware revision. See our GE Speedtronic part number decoder for the complete naming structure.

Related Parts

BICL (Bridge Interface) and its matching Bridge Personality Interface board (BPIA/BPIB/SCNV) are common companions in the same EX2100 cabinet. Browse our Mark VI IS200 boards collection for the rest of the catalog.

What to Include in Your RFQ

• Full part number and suffix (IS200EACFG2BAA)
• Confirmed exciter voltage class
• Generator/turbine model and site
• Quantity and urgency

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