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Help CenterGE IS200EXAMG1BAA – Exciter AC Measurement Board for EX2100 / Mark VI Excitation Systems
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The GE IS200EXAMG1BAA is an Exciter AC measurement/conditioning board commonly used in EX2100 and Mark VI-based excitation cabinets. From my experience, it typically handles three-phase PT/CT signals, filters and scales them, and delivers clean AC feedback (RMS voltage, current, frequency, and phase) to the controller. If you’re maintaining a legacy generator excitation system, this board keeps VAR/PF control and protective functions behaving as expected without re-engineering the rack.
Three-phase PT/CT inputs – Accepts typical 100–120 V PT secondaries and 1/5 A CT feedback for generator/bus measurements.
Signal conditioning and scaling – Anti-alias filtering and burden/sense networks help deliver stable, low-noise AC measurements to the control core.
RMS and frequency tracking – Provides the data the controller needs for VAR/PF regulation, synchronizing checks, and protective limits.
Backplane integration – Powered and read via the GE control backplane; no separate fieldbus on the board, which simplifies wiring.
Diagnostics-friendly design – You might notice test points and status indicators on many revisions, making outage troubleshooting faster.
Drop-in replacement – Matches the IS200 form factor and connectors for quick swap-outs during planned or forced outages.
Industrial build quality – Conformal coating and component selection suited for control cabinets in power plants and heavy industry.
| Brand / Model | GE IS200EXAMG1BAA |
| System Compatibility | EX2100 and Mark VI excitation/control racks (legacy installed base) |
| Power Requirements | Supplied via control backplane (nominal 24–28 Vdc distribution, typical) |
| Signal Input Types | Three-phase PT voltage (≈100–120 Vac secondary); CT current (1 A or 5 A via burden network) |
| Signal Output to Controller | Conditioned analog/converted measurements via proprietary backplane interface |
| Communication Interfaces | Backplane only; no external fieldbus ports on the module |
| Installation Method | Rack-mounted IS200 board; mates with edge connectors in the control chassis |
| Operating Temperature | 0–60°C typical for cabinet-mounted GE control electronics |
| Dimensions & Weight | Standard IS200 (6U-class) PCB form factor; lightweight card assembly |
You’ll typically see the IS200EXAMG1BAA anywhere GE excitation hardware needs dependable AC feedback:
Utility and IPP power plants – generator voltage sensing, VAR/PF regulation, and synchronizing checks.
Oil & gas and petrochemical sites – reliable exciter feedback for compressor drivers and cogeneration units.
Heavy industry (steel, mining, pulp) – stable excitation under fluctuating load profiles and network disturbances.
Brownfield life-extension projects – like-for-like replacements that keep existing control logic intact.
Assured compatibility – Matches the IS200 architecture, so controller scaling and protection setpoints usually remain unchanged.
Reduced downtime – Swap and reseat often takes a short maintenance window; commissioning checks are straightforward.
Stable measurements – Clean AC feedback helps avoid nuisance alarms and oscillations in VAR/PF control loops.
Procurement-friendly – Targeted board replacement is typically more economical than retrofitting sensing across the cabinet.
Field note
A combined-cycle operator shared that replacing a noisy EXAM card stabilized their generator voltage readings and stopped intermittent VAR hunting. It wasn’t dramatic, but it shaved time off every startup because synchronizing checks passed on the first attempt more often.
Environment – Mount in a clean, ventilated excitation cabinet. Keep ambient 0–60°C and avoid condensation and corrosives.
Wiring practices – Use shielded twisted pairs for PT/CT leads, keep CT polarity consistent, and ensure CT shorting blocks are in the safe position during work.
Grounding & noise – Bond shields at a single point (typically cabinet end) and separate AC sensing from high dV/dt cabling.
Handling – ESD strap on; handle by the edges. Inspect backplane connectors for wear or oxidation and clean with approved contact wipes.
Commissioning – Verify PT ratios and CT burden settings against site drawings; run controller scaling checks and confirm frequency/phase readings under no-load and load.
Routine care – Periodic dust removal with dry air, terminal torque checks, and review of trend data to catch drift or phase imbalance early.
Manufactured to GE control hardware standards for industrial EMC and safety in excitation systems.
CE/UL/RoHS typically apply at the complete cabinet/system level depending on vintage; check your project documentation.
Warranty – Commonly supplied with a limited 12‑month warranty from the seller; repair/exchange programs are often available.
IS200EMIO… – Exciter Main I/O board that interfaces discrete/analog I/O to the controller.
IS200EDEX… – Exciter DC feedback module for field voltage/current measurement.
IS200EACF… – AC feedback/conditioning modules used alongside EXAM in some builds.
If you can share your panel tag, exciter type, and slot map, I can help double-check slot location, CT/PT scaling assumptions, and any jumper links specific to IS200EXAMG1BAA before you schedule the outage.
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