DS200DCFBG1BJB: Used, Tested, and Ready to Ship

This DS200DCFBG1BJB is a used, cleaned-and-tested G1-group DCFB – GE's Power Supply Board for the EX2000 excitation control system, with the same design shared across the DC2000, CB2000, FC2000, GF2000, ME2000, and AC2000 IGBT drive families. It delivers control-level power to the drive or exciter and 115 VAC to the enclosure cooling fans, using 38 VAC and 115 VAC input from the control power transformer (CPT). Onboard circuits include control-level power supplies (+5 V, ±15 V, ±24 V), motor/generator field power circuits, driver circuits for the armature SCR gate pulse generators, and instrumentation circuits for AC line and DC motor signals.

The DCFB interfaces directly with the SDCC drive control card (or LDCC on EX2000 systems) via the 1PL and 2PL connectors. The 38 VAC supply from the CPT is rectified and filtered to ±24 VDC (+24 V at 3 A, -24 V at 1 A); onboard regulators derive ±15 VDC from that, and the +24 VDC rail also produces a +5 VDC, 4 A output that the drive control card's own microprocessor relies on to keep operating.

What to Rule Out Before You Order a Replacement

A DCFB fault and an SDCC/LDCC fault frequently look the same from the operator interface, since the two boards are electrically tied together. The DCFB's /PSEN signal on 2PL sits TTL-low when its +5 VDC output is properly regulated, and switches high – forcing an SDCC/LDCC microprocessor reset – the instant that rail sags. If your drive or exciter keeps resetting on its own, that can point to the DCFB's power supply rather than a fault in the drive control card itself. Before you condemn either board:

• Check the DCFB's own fuse-status indicators. LEDs CR51 and CR55 flag a blown FU2 or FU3 (7 A power-output fuses); a neon lamp at LT1 flags a blown FU1 (1/2 A, on the 115 VAC fan output).
• Measure the +5 V and ±24 V rails reaching the SDCC/LDCC before assuming its logic has failed.
• Be skeptical of a "bad batch" explanation. Long-time Mark V/EX2000 technicians report that a card position that keeps failing repeatedly is usually a sign of a field device, wiring, voltage, or current problem downstream – not a run of defective boards.
• Check the companion card, too. Documented cases exist where a DCFB and its companion LDCC kept failing together and the real cause was a failing capacitor on the LDCC. Since GE never released full schematics for this card generation, a specialized repair shop with card-level test equipment is often the quickest route to a confirmed diagnosis.

Reading DS200DCFBG1BJB

DS200 is the board series prefix, DCFB is the Power Supply Board acronym, G1 is this board's product grouping, and BJB is the specific functional and artwork revision combination of this unit. GE's manual reference is GEI-100028. We have not found a documented functional difference between G1 and G2 DCFB groups, so treat the group letter as a hardware/manufacturing revision and match the full suffix on your existing card.

Related Boards and Longer-Term Options

The DCFB pairs with the SDCC (or LDCC on EX2000) drive control card and the panel's TCPS power supply. If your site is planning a platform migration, see our Mark V vs Mark VI: DS200 to IS200 guide. For GE's Speedtronic part-numbering logic, see the GE Speedtronic Part Number Decoder, and for the DCFB's place among other DS200 boards, see GE Mark V DS200 Boards Explained.

What to Send for a Quote

• The complete part number and suffix, e.g., DS200DCFBG1BJB
• A photo of the label
• Turbine/generator model, and whether this feeds an EX2000 exciter or a DC2000-family drive
• Quantity needed
• Urgency – planned outage or active fault

Request a Quote

This DS200DCFBG1BJB is offered used, cleaned and tested, with a 1-year warranty (see below). Pricing isn't published online since these quotes depend on exact revision match and current stock – submit a Request a Quote and expect a reply within 24 hours. We ship worldwide DDP, accept purchase orders, and support both planned outages and urgent turbine-down orders.

General Information about the Product
Part Number	DS200DCFBG1B Mark V DS200
Description	DS200DCFBG1BJB by GE General Electric DS200DCFBG1B Power Supply Board Mark V
Condition	used Cleaned and Tested. With 1 Year Warranty.