DS200DCFBG1BKC: Power Supply for EX2000 and Related Drives

DS200DCFBG1BKC is a G1-group DCFB – the Power Supply Board GE built for its EX2000 excitation control system, with the same design also used across the DC2000, CB2000, FC2000, GF2000, ME2000, and AC2000 IGBT drive families (the board plays a somewhat different role in EX2000 excitation service than in a standard drive). It supplies control-level power to the drive or exciter and 115 VAC to the enclosure cooling fans, drawing 38 VAC and 115 VAC from the control power transformer (CPT). Onboard, you'll find 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 works closely with the SDCC drive control card (or LDCC on EX2000 systems), passing feedback and power-good signals through the 1PL and 2PL connectors. The 38 VAC from the CPT is rectified and filtered into ±24 VDC (+24 V at 3 A, -24 V at 1 A), from which onboard regulators derive ±15 VDC, and the +24 VDC rail also produces a +5 VDC, 4 A output that plays a direct role in keeping the drive control card running – which is exactly why DCFB troubleshooting matters so much.

Diagnosing a DCFB Fault Before You Replace It

A DCFB fault and an SDCC/LDCC fault often look the same to an operator, because the two boards are wired to interact directly. The DCFB's /PSEN signal on 2PL sits TTL-low when its +5 VDC output is properly regulated, and goes high – forcing a reset of the SDCC/LDCC microprocessor – the moment that 5 V rail sags. In other words, a drive or exciter that keeps resetting on its own can be telling you about the DCFB's power supply, not a fault in the drive control card's logic. Before ordering a replacement of either board:

• Read the DCFB's own fuse indicators. LEDs CR51 and CR55 flag a blown FU2 or FU3 (the 7 A power-output fuses); a neon lamp at LT1 flags a blown FU1 (the 1/2 A fuse on the 115 VAC fan output).
• Measure the +5 V and ±24 V rails reaching the SDCC/LDCC before condemning that card's logic.
• Treat a repeat failure in the same slot as a wiring problem until proven otherwise. Experienced Mark V/EX2000 technicians consistently report that when the same card position fails again and again, it's much more often a field device, wiring, voltage, or current issue downstream than a run of bad boards.
• Consider the companion card, not just the DCFB. There are documented cases where a DCFB and its companion LDCC card both kept failing, and the actual root cause turned out to be a failing capacitor on the LDCC, not the DCFB. Since GE never published full schematics for this card generation, a specialized repair shop with card-level test equipment is often the fastest way to pin down which board is genuinely at fault.

What G1BKC Means

DS200 is the board series prefix, DCFB is the Power Supply Board acronym, G1 is this board's product grouping, and BKC is the specific functional and artwork revision combination of this unit. GE's manual reference for this board is GEI-100028. We haven't found a documented functional difference between G1 and G2 DCFB boards comparable to the exciter distinction on other DS200 families, so treat the group letter as a hardware/manufacturing revision and match the full suffix on the card you're replacing rather than assuming interchangeability.

Related Boards and the Bigger Picture

The DCFB is typically discussed alongside the SDCC (or LDCC on EX2000) drive control card and the panel's TCPS power supply. For sites planning a longer-term platform change, see our Mark V vs Mark VI: DS200 to IS200 guide. For the logic behind GE's Speedtronic part numbering, 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., DS200DCFBG1BKC
• A photo of the label
• Turbine/generator model, and whether this feeds an EX2000 exciter or a DC2000-family drive
• Quantity
• Urgency – planned outage or active fault

Request a Quote

This DS200DCFBG1BKC is offered used, clean and tested, with a 1-year warranty (see below). We don't publish pricing 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 outages and urgent turbine-down orders.

General Information about the Product
Part Number	DS200DCFBG1B Mark V DS200
Description	DS200DCFBG1B by GE DS200DCFBG1BKC Power Supply Board Mark V DS200
Condition	used Clean and Tested. With 1 Year Warranty