An IGBT Bridge Fault Alarm Doesn't Always Mean This Board

When an EX2100 excitation cabinet throws a bridge or IGBT-related fault, it's tempting to order the first board in the fault path — usually this one. Before you do, understand the chain: the EX2100's main regulator/control board sends firing commands through the IS200BICLH1B to a Bridge Personality Interface board (BPIA, BPIB, or SCNV), which connects to the actual IGBT power module. A fault can originate at any of those three points. The BICL is the messenger and the temperature/fan monitor in that chain — it isn't the power semiconductor itself, and it isn't the bridge personality board either. Narrowing down which stage is actually reporting the fault before ordering saves you from replacing a healthy board.

What This Board Does

IS200BICLH1B is an IGBT Drive/Source Bridge Interface Board for GE's EX2100 excitation control platform — it's built for generator field excitation, not turbine control logic, even though it uses the same IS200 numbering convention as Mark VI. It carries firing commands out to the bridge personality board and returns diagnostic data (current levels, thermal status) to the main controller. It also independently monitors ambient and bridge temperature and interfaces with the cabinet's PWM fan speed control and system fault display.

New Surplus vs. a Cleaned-and-Tested Unit

This particular listing is new surplus in factory packaging. For excitation spares that may sit on a shelf for years before they're needed, factory-packaged stock is often the preferred choice for planned outages or spares kits, while a cleaned-and-tested used unit is a reasonable option for an urgent like-for-like swap. Both carry our standard 1-year warranty.

Get the Slot Right

The board's faceplate is nearly blank apart from two brackets and a label instructing installation in Slot 5 only. This is a hard requirement, not a suggestion — the backplane wiring in that rack position is specific to the BICL, and installing it elsewhere risks damage. Use standard anti-static handling and verify the slot before powering down for the swap.

Checks Before You Condemn the Board

• Confirm which stage is actually faulting — BICL, BPIA/BPIB/SCNV, or the IGBT power module — rather than assuming it's the first board in the chain.
• On an overtemperature trip, check the cooling fan and cabinet airflow before suspecting the BICL's monitoring circuit.
• After any board swap, confirm it's in Slot 5 and that its EPLD completed configuration from the CPU at power-up.

Reading the Part Number

IS200BICLH1B IS200BICLH1BBA: BICL is the functional board code, H marks surface-mount technology, and BA (after H1B) tracks this unit's revision. GE's reference manual for this board family is GEI-100264. Our Speedtronic part number decoder covers the rest of the naming convention.

Related Parts

Order with the matching Bridge Personality Interface board (BPIA, BPIB, or SCNV) for the same bridge, and consider EACF exciter feedback boards if you're stocking the wider EX2100 cabinet. See our Mark VI IS200 boards collection for the broader catalog.

Include This in Your RFQ

• Full part number and suffix (IS200BICLH1BBA)
• Confirmation this is for EX2100 excitation, not Mark VI turbine I/O
• Generator/turbine model and site
• Urgency and quantity

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