DS200DCFBG1BGB in the EX2000/Drive Power Chain

DS200DCFBG1BGB is a G1-group DCFB, GE's Power Supply Board for the EX2000 excitation control system, with the same board design shared across the DC2000, CB2000, FC2000, GF2000, ME2000, and AC2000 IGBT drive families. 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). The board hosts 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.

This card works in direct partnership with the SDCC drive control card (or LDCC on EX2000 systems), exchanging feedback and power-good signals over connectors 1PL and 2PL. The CPT's 38 VAC supply is rectified and filtered into ±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 depends on to keep running.

Diagnose Before You Order a Replacement

A DCFB failure and an SDCC/LDCC failure often present identically to an operator, because the two boards are tied together electrically. The DCFB's /PSEN signal on 2PL is TTL-low when its +5 VDC output is properly regulated; the instant that rail sags, /PSEN goes high and forces the SDCC/LDCC's microprocessor to reset. A drive or exciter that keeps resetting can therefore be a DCFB power supply symptom rather than a drive control card fault. Before replacing either board:

• Read the DCFB's own fuse-status indicators. LEDs CR51 and CR55 flag a blown FU2 or FU3 (7 A power-output fuses); neon lamp LT1 flags a blown FU1 (1/2 A, on the 115 VAC fan output).
• Measure the +5 V and ±24 V rails feeding the SDCC/LDCC before assuming its own logic is at fault.
• Treat repeat failures in the same slot as a wiring problem first. Field experience on Mark V/EX2000 systems repeatedly shows that a card position that keeps failing points to a field device, wiring, voltage, or current issue downstream far more often than a run of bad boards.
• Watch the companion card, too. There are documented cases where a DCFB and its companion LDCC kept failing together, with the actual cause traced to a failing capacitor on the LDCC rather than the DCFB. GE never released full schematics for this card generation, so a specialized repair shop with card-level test equipment is often the fastest way to a confirmed answer.

What G1BGB Means

DS200 is the board series prefix, DCFB is the Power Supply Board acronym, G1 is the product grouping, and BGB is this unit's specific functional and artwork revision combination. GE's manual reference for this board is GEI-100028. We haven't found a documented functional split between G1 and G2 DCFB boards, so treat the group letter as a hardware/manufacturing revision marker and match the exact suffix on your existing card.

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 plants planning a longer-term platform change, see our Mark V vs Mark VI: DS200 to IS200 guide. For how GE's Speedtronic part numbers are structured, 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., DS200DCFBG1BGB
• 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 DS200DCFBG1BGB 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 availability – 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	DS200DCFBG1B By General Electric DS200DCFBG1BGB Mark V DS200 Power Supply Board
Condition	used Cleaned and Tested. With 1 Year Warranty