DS200SDCIG1AHB: What It Is and What It Does

When a DC2000 drive needs power-supply and instrumentation circuitry, the board handling that job is the SDCI – and DS200SDCIG1AHB is a G1-group unit. GE lists this board within the Mark V DS200 series because DC2000 drives are frequently used as auxiliary or starting equipment on gas turbine trains controlled by a Speedtronic Mark V panel. The board itself packs several power supplies, motor field power circuits, driver circuits for armature SCR gating, and instrumentation circuits covering AC line and DC motor signals – armature current and voltage, field current and voltage, voltage magnitude, and phase sequence.

G1-group SDCI boards, including this one, include an internal field exciter circuit rated at 10 amps or less. That's a real distinction from G2-group SDCI boards, which are built instead for an external field exciter. Note that the SDCI lives on the drive side of the system – wired directly into field CTs, shunts, and motor/field circuits – rather than plugging into the Mark V's <R>/<S>/<T>/<C> control cores the way the turbine control cards do.

Diagnose the Fault Before You Replace the Board

The SDCI is designed to help you troubleshoot it, if you use the tools it gives you. Every protective fuse – FU1 (115 VAC supply), FU2/FU3 (signal-level power), FU5/FU6 (internal NRX/MOV assembly) – has an LED that lights when that specific fuse blows. Before assuming the board is at fault:

• De-energize the drive completely and let the board discharge before working on it – high voltage can persist even with the drive shut down.
• Trace the field wiring on that fuse's circuit for a short or degraded insulation before simply replacing the fuse. One blown fuse can be a one-off event; a fuse that keeps blowing is very often pointing at a wiring or field-device fault, not a defective board.
• Clear the external fault before installing any replacement board – otherwise the new unit's fuse (or the board) is likely to go the same way almost immediately.

Before finishing any swap, transfer the exact jumper and switch settings from the old card: JP1 (MD control source jumper), JP2 (AC contactor drop-out time jumper), and SW1 (AC line CT burden selection, based on nominal DC output current). And since G1 vs. G2 reflects how the drive's field exciter is actually wired, confirm your drive is set up for an internal exciter before assuming a G1 board is the correct group – a G2 board can physically occupy the same slot but won't function correctly if your exciter wiring doesn't match.

What This Part Number Tells You

DS200 is the board series prefix, SDCI is the DC Power Supply and Instrumentation functional acronym, G1 is the product group (internal field exciter, ≤10 A), and HB is this unit's specific revision combination. GE documents this board family under instruction manual GEI-100173. Treat G1 and G2 as different exciter configurations rather than simple revision levels, and always confirm which group your drive requires before ordering.

Related Boards and the Bigger Picture

Because the SDCI serves the drive/exciter side of the system, it isn't part of the same card-to-card troubleshooting group as Mark V control-core boards like TCDA or TCEA. To see how the SDCI's DS200 numbering fits within the wider Mark V board lineup, see our GE Mark V DS200 Boards Explained guide, and for the logic behind GE's Speedtronic part numbers, see the GE Speedtronic Part Number Decoder. For plants planning a platform migration, our Mark V vs Mark VI: DS200 to IS200 guide covers the general shift to GE's newer architecture.

What to Send for a Quote

• Full part number and suffix, e.g., DS200SDCIG1AHB
• A photo of the label, if available
• The drive/turbine model, and whether your exciter is internal or external
• Quantity needed
• Urgency – planning ahead or an active issue

Request a Quote

This DS200SDCIG1AHB is offered used, clean and tested, with a 1-year warranty (see below). Pricing isn't published online since these quotes depend on exact revision match and current availability – submit a Request a Quote and expect a response within 24 hours. We ship worldwide DDP, accept purchase orders, and support both scheduled maintenance and urgent downtime orders.

General Information about the Product
Part Number	DS200SDCIG1A Mark V DS200
Description	DS200SDCIG1A By GE DS200SDCIG1AHB DC Power Supply and Instrumentation Board
Condition	used Clean and Tested. With 1 Year Warranty.