Understanding the DS200SDCIG1AFB Board

SDCI stands for DC Power Supply and Instrumentation Board, and DS200SDCIG1AFB is a G1-group version built by GE for its DC2000 static drive line. It's sold under the Mark V DS200 series because DC2000 drives like this one very often run as auxiliary or starting equipment on turbines controlled by a Speedtronic Mark V panel. Onboard circuitry includes several power supplies, motor field power circuits, driver circuits for armature SCR gating, and instrumentation for AC line and DC motor signals: armature current and voltage, field current and voltage, voltage magnitude, and phase sequence.

Being a G1-group board, this unit carries an internal field exciter circuit rated at 10 amps or less – distinct from the G2 group, which is built for an external exciter instead. Keep in mind the SDCI operates on the drive/exciter side of the system, wired into field CTs, shunts, and motor circuits, rather than sitting in the Mark V's <R>/<S>/<T>/<C> control cores alongside boards like TCDA.

Before You Buy: Diagnose It Properly

This board gives you the tools to troubleshoot before you spend money on a replacement. Each protective fuse – FU1 (115 VAC supply), FU2/FU3 (signal-level power), FU5/FU6 (internal NRX/MOV assembly) – has a dedicated LED that lights when that fuse blows. When you see one lit:

• Cut all power to the drive and let the board fully discharge before opening the cabinet further – high voltage can remain present after shutdown.
• Inspect the field wiring on that specific circuit for a short or insulation failure before replacing the fuse. A fuse that blows once might just be a fluke; one that keeps blowing almost always means a downstream wiring or field-device fault, not a bad board.
• Fix the wiring fault first, then replace the fuse or board – skipping this step means a brand-new board is likely to fail the same way within minutes of power-up.

When installing a replacement, match the jumper and switch settings from the card you removed: 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 the G1/G2 distinction reflects a genuine difference in exciter wiring, don't assume a G1 board is correct just because it's the same base SDCI number – confirm your drive uses an internal exciter first.

Reading DS200SDCIG1AFB

DS200 is the board series prefix, SDCI is the functional acronym for this DC Power Supply and Instrumentation design, G1 is the product group (internal field exciter, ≤10 A), and FB is this unit's revision combination. The relevant GE instruction manual for this board family is GEI-100173. G1 and G2 are not interchangeable revision levels of one board – they describe genuinely different exciter configurations, so match the group to your drive.

Related Boards and Wider Context

Since the SDCI belongs to the drive/exciter side rather than the Mark V turbine control core, it isn't grouped with cards like TCDA or TCEA in day-to-day troubleshooting. To see where the SDCI fits among the broader Mark V DS200 board family, see our GE Mark V DS200 Boards Explained guide, and for how GE builds its Speedtronic part numbers, see the GE Speedtronic Part Number Decoder. If a platform migration is on your roadmap, our Mark V vs Mark VI: DS200 to IS200 guide explains the general shift to GE's later architecture.

What to Include in Your Quote Request

• The complete part number and suffix, e.g., DS200SDCIG1AFB
• A photo of the existing card's label
• Drive/turbine model, and whether the exciter is internal or external
• Quantity
• Urgency – planned procurement or active downtime

Request a Quote

This DS200SDCIG1AFB is offered used, cleaned and tested, with a 1-year warranty (details below). Pricing isn't published online since these quotes depend on exact revision match and current stock – submit a Request a Quote and our team will respond within 24 hours. We ship worldwide DDP, accept purchase orders, and support both planned work and urgent downtime orders.

General Information about the Product
Part Number	DS200SDCIG1A Mark V DS200
Description	DS200SDCIG1AFB by GE DS200SDCIG1A DC Power Supply and Instrumentation Board
Condition	used Cleaned and Tested. With 1 Year Warranty.