New Surplus, Factory Packaged: When That Matters

This IS200VAICH1C is offered as new surplus in its original factory packaging — unused, not a cleaned-and-tested pull. For a VME analog I/O card that runs 200 Hz turbine protection logic, that distinction is worth paying attention to when you're building critical spares inventory versus sourcing a quick like-for-like swap. Both conditions carry our standard 1-year warranty; the choice usually comes down to budget, lead time, and whether the requirement is an emergency unit-down replacement or planned spares stocking.

Installing It Correctly

VAIC is a VME-format card and goes into the Mark VI processor rack, not a terminal cabinet. Before installation: remove power from the VME rack, slide the board in on its guide rails, seat the edge connectors fully, and tighten the captive screws at the top and bottom of the front panel. Handle the card using standard anti-static precautions before it's seated — like most Mark VI boards, the components are static-sensitive. After power-up, confirm the front-panel RUN LED settles to flashing green; a solid red LED indicates FAIL, and a steady orange LED indicates a diagnostic alarm (STATUS) rather than normal operation.

What This Card Is For

Functionally, the IS200VAICH1C is a VME Analog Input/Output board handling 20 analog inputs and 4 analog outputs for a Mark VI turbine controller. Field wiring lands on a TBAI terminal board rather than the card itself; the terminal board connects to the VAIC by cable, and the card converts field signals to digital data sent over the VME backplane to the VCMI communications card. For outputs, the process runs in reverse — a digital command from the controller becomes an analog current delivered through the terminal board to the field device.

Don't Assume the Card Is Bad — Check These First

• A dead or pegged channel is frequently a terminal board or field-wiring fault (blown fuse, open loop, loose terminal), not a card failure.
• In TMR panels, one VAIC flagging a channel as deviating from the voted median often means that specific field signal has drifted, not that the flagged card has failed.
• A hardware incompatibility alarm after any board swap almost always traces back to a terminal-board generation mismatch — see compatibility notes below before returning a "bad" card.
• The board's stall-detection firmware (see below) depends entirely on healthy pressure transducer signals; a nuisance stall trip is more often a transducer issue than a card issue.

Gas Turbine Compressor Stall Detection

VAIC firmware runs compressor stall detection at 200 Hz using the first four analog inputs on the card, with separate algorithms for small LM-class and heavy-duty gas turbines based on compressor discharge pressure (PS3) and its rate of change. A confirmed stall condition sends a trip signal to the controller, which can initiate a shutdown through the fuel shutoff valves.

Terminal Board Compatibility

IS200VAICH1CBA belongs to the original VAIC generation (through H1C), which pairs with a TBAIH1B-or-earlier terminal board or any DTAI revision, rated up to 500 Ω of 20 mA output load over 1,000 ft of #18 wire. The newer H1D generation instead requires TBAIH1C or later, or STAI, with a higher load rating — the two generations are not interchangeable on the terminal board side. For the full character-by-character breakdown of the part number, see our GE Speedtronic part number decoder.

Sourcing the Rest of the Panel

TBAI/DTAI/STAI terminal boards and the VCMI communications card are the usual companions to a VAIC order. See our Speedtronic turbine control boards collection for the wider Mark VI catalog.

For a Fast, Accurate Quote, Tell Us

• Exact part number and suffix (IS200VAICH1CBA)
• Simplex or TMR system
• Turbine model and site
• Quantity and urgency

Request a Quote

Pricing isn't published here — request a quote and we'll confirm current stock and DDP pricing within 24 hours. We ship worldwide and accept purchase orders.