DS200SDCIG2ADA: A G2-Group SDCI Board

DS200SDCIG2ADA is an SDCI – DC Power Supply and Instrumentation Board – built by GE for the DC2000 static drive line, and sold under the Mark V DS200 series because DC2000 drives commonly serve as auxiliary or starting equipment on turbines controlled by a Speedtronic Mark V panel. The board carries multiple power supplies, motor field power circuits, driver circuits for armature SCR gating, and instrumentation circuits for AC line and DC motor signals – armature current and voltage, field current and voltage, voltage magnitude, and phase sequence.

What sets this one apart is the G2 grouping: G2 SDCI boards are configured for an external field exciter, in contrast to G1-group SDCI boards, which include an internal field exciter circuit rated at 10 amps or less. If your drive uses an external exciter, a G1 board will not do the job correctly even though it shares the same base SDCI part number. The SDCI itself sits on the drive/exciter side of the system, wired directly into field CTs, shunts, and motor circuits, rather than in the Mark V's <R>/<S>/<T>/<C> control cores.

Diagnose Before You Replace It

The SDCI is built with its own troubleshooting aids: each protective fuse (FU1 for the 115 VAC supply, FU2/FU3 for signal-level power, FU5/FU6 for the internal NRX/MOV assembly) has a dedicated LED that lights when that fuse has blown. Before you replace anything:

• Remove all power from the drive and allow the board to fully discharge – high voltage can be present even after the drive is shut down.
• Inspect the field wiring tied to the blown fuse's circuit for a short circuit or degraded insulation before you replace the fuse itself. A single blown fuse can be incidental; a fuse that blows repeatedly is telling you about a downstream wiring or field-device fault far more often than a bad board.
• Resolve the external fault before fitting a new board – otherwise the replacement is likely to blow the same fuse again almost immediately.

When you install a replacement SDCI, carry over 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) – rather than leaving them at factory default. And since your exciter wiring determines whether you need G1 or G2, confirm that before ordering rather than assuming the group doesn't matter.

What G2ADA Tells You

DS200 is the board series prefix, SDCI is the DC Power Supply and Instrumentation acronym, G2 is the product group (external field exciter), and ADA is this unit's specific revision combination. GE's instruction manual for this board family is referenced as GEI-100173. Don't treat G1 and G2 as simple revision levels – they reflect a real functional split based on how your drive's exciter is wired, so match the group to your actual equipment.

Related Boards and the Bigger Picture

Because the SDCI serves the drive/exciter side of the system rather than the Mark V turbine control core, it isn't grouped in day-to-day troubleshooting with cards like TCDA or TCEA. 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. For a longer-term platform view, our Mark V vs Mark VI: DS200 to IS200 guide covers the general shift to GE's newer architecture.

Information to Include in Your Quote Request

• Complete part number and suffix, e.g., DS200SDCIG2ADA
• A label photo, if you can get one
• Drive/turbine model and confirmation of internal vs. external exciter
• Quantity
• Urgency – planning ahead or an active issue

Request a Quote

This DS200SDCIG2ADA is offered used, cleaned and tested, with a 1-year warranty (see below). We keep pricing off our site 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 planned maintenance and urgent downtime orders.

General Information about the Product
Part Number	DS200SDCIG2A Mark V DS200
Description	DS200SDCIG2A By GE DS200SDCIG2ADA Power Supply Control Board
Condition	used Cleaned and Tested. With 1 Year Warranty.