DS200SDCIG1AFB: Function and Application

This is a new-surplus, factory-packaged DS200SDCIG1AFB – an SDCI DC Power Supply and Instrumentation board built by GE for the DC2000 static drive family. It's cataloged in the Mark V DS200 series because DC2000 drives of this kind commonly run as auxiliary or starting equipment alongside a Speedtronic Mark V-controlled turbine. On board, you'll find multiple power supplies, motor field power circuits, driver circuits for armature SCR gating, and instrumentation circuitry that reads AC line and DC motor signals: armature current and voltage, field current and voltage, voltage magnitude, and phase sequence.

As a G1-group SDCI, this board includes circuitry for an internal field exciter rated at 10 amps or less – a real functional distinction from the G2 group, which is built for an external exciter instead. The SDCI sits on the drive/exciter side of the system, interfacing directly with field wiring, current transformers, and shunts, rather than living in the Mark V's <R>/<S>/<T>/<C> control cores the way boards like TCDA do.

Diagnosis Before You Ever Need This Spare

Since this unit ships new and factory-packaged, it's most likely destined for a spares program rather than an immediate swap – which makes it worth documenting now how to actually diagnose an SDCI fault later, rather than reaching for a spare at the first sign of trouble. The board is built with this in mind: each protective fuse (FU1 on the 115 VAC supply, FU2/FU3 on signal-level power, FU5/FU6 on the internal NRX/MOV assembly) has its own LED that lights when that fuse blows. When that happens:

• Fully de-energize the drive and allow the board to discharge before handling it – high voltage can remain present after shutdown.
• Check the field wiring tied to that circuit for a short or insulation breakdown before replacing the fuse. A single blown fuse can be incidental; a fuse that blows repeatedly is telling you about a downstream wiring or field-device problem far more often than a defective board.
• Only install a replacement board once the external fault is cleared – otherwise the new board's fuse (or the board itself) is likely to fail again almost immediately.

When you do install this or any SDCI, transfer the jumper and switch settings from the old card exactly: 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) should match the outgoing board, not factory defaults. And because G1 vs. G2 reflects a real difference in how the drive's field exciter is wired, confirm your drive uses an internal exciter before assuming this G1 board is the right group.

Decoding This Part Number

DS200 is the board series prefix, SDCI identifies the DC Power Supply and Instrumentation function, G1 is the product grouping (internal field exciter, ≤10 A), and FB is this unit's specific revision combination. GE's instruction manual for this board is referenced as GEI-100173. Don't treat G1 and G2 as simple revision numbers – they describe genuinely different exciter configurations, so match the group your drive actually requires rather than assuming either will work.

Related Boards and Broader Platform Context

The SDCI belongs to the drive/exciter side of a Mark V-adjacent system rather than the turbine control core itself, so it isn't paired with cards like TCDA or TCEA the way those boards are paired with each other. For how the SDCI's DS200 numbering relates to the wider Mark V board family, see our GE Mark V DS200 Boards Explained guide and the GE Speedtronic Part Number Decoder. If you're planning a longer-term migration off Mark V-era hardware, see our Mark V vs Mark VI: DS200 to IS200 guide.

What We Need to Quote This Accurately

• The complete part number and suffix, e.g., DS200SDCIG1AFB
• A photo of your existing card's label, for comparison
• The drive/turbine model and whether the exciter is internal or external
• Quantity
• Whether this is for stock or an active requirement

Request a Quote

This DS200SDCIG1AFB is new-surplus, factory-packaged stock with a 1-year warranty (details 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 reply within 24 hours. We ship worldwide DDP, accept purchase orders, and support both spares planning and urgent downtime orders.

General Information about the Product
Part Number	DS200SDCIG1A Mark V DS200
Description	DS200SDCIG1A By GE DS200SDCIG1AFB DC Power Supply and Instrumentation Board NSFP
Condition	newSurplusFactoryPackage With 1 Year Warranty.