Overtemperature Trip on Your Exciter? Read This Before Ordering

One of the IS200BICLH1A's jobs is thermal supervision: it monitors both ambient cabinet temperature and bridge temperature, and it drives the cooling fan through a PWM speed-control interface. That means an overtemperature fault on an EX2100 excitation cabinet can come from three different places — a genuinely hot bridge (check load, ventilation, and the fan itself first), a stuck or failed fan no longer responding to the PWM command, or, less commonly, a fault in the BICL's own monitoring and fan-drive circuitry. Chase the mechanical causes before you assume the board itself needs replacing.

What This Board Is (and Isn't)

IS200BICLH1A is an IGBT Drive/Source Bridge Interface Board built for GE's EX2100 excitation control system, not a Mark VI turbine-control I/O card — both product lines happen to share the IS200 numbering convention, which is why this board often gets mislabeled generically. Functionally, it sits between the EX2100's main regulator board and the Bridge Personality Interface board (BPIA, BPIB, or SCNV) that connects to the IGBT power bridge, carrying firing commands out and diagnostic feedback back, in addition to its temperature and fan-control duties and a system fault display interface.

Handling and Installation

The faceplate carries almost nothing beyond two mounting brackets and a single label specifying installation in Slot 5 only — follow it exactly, since backplane wiring at that position is specific to this board and an incorrect slot risks damage. Treat it like any other static-sensitive Mark VI-era or EX2100 board during handling.

What's Under the Hood

A 1024-bit serial memory on the board stores its own ID and revision information. Control logic runs through an onboard EPLD (electronically programmable logic device), configured by the main CPU at power-up or a hard reset. GE documents this board family under manual GEI-100264.

Before You Buy: A Short Checklist

• Confirm the fault is actually thermal (fan, airflow, load) before assuming the monitoring circuit failed.
• Trace whether a bridge fault originates at the BICL, the BPIA/BPIB/SCNV board, or the IGBT module itself.
• After installing a replacement, verify it's seated in Slot 5 and completed a clean EPLD configuration cycle.
• Check the system fault display wiring before condemning the board over a missing or stuck status indication.

Decoding IS200BICLH1ACB

BICL is the functional board code, H marks surface-mount technology, and CB (after H1A) identifies this unit's specific revision — confirm it against the physical label since revisions aren't always interchangeable. Our part number decoder breaks down the full IS200 naming convention used across both Mark VI and EX2100 boards.

What Else You'll Likely Need

The matching Bridge Personality Interface board (BPIA, BPIB, or SCNV) and other EX2100 cards such as EACF exciter feedback boards typically get ordered alongside a BICL. See our Speedtronic turbine control boards collection for the full catalog.

What to Send Us

• Complete part number and suffix (IS200BICLH1ACB), plus a label photo if unsure of revision
• Confirmation this is for EX2100 excitation
• Generator/turbine model and site
• Quantity and urgency

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