DS200DCFBG1BLC: New-Surplus Power Supply Board

This is a new-surplus, factory-packaged DS200DCFBG1BLC – a G1-group DCFB Power Supply Board built by GE for the EX2000 excitation control system, with the same design shared across the AC2000, DC2000, CB2000, FC2000, GF2000, and ME2000 IGBT drive families. The board 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). It carries 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 interacts directly with the SDCC drive control card (or LDCC on EX2000 systems) over the 1PL and 2PL connectors. The CPT's 38 VAC input is rectified and filtered to ±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 5 V rail directly influences whether the drive control card stays running, which is the key to diagnosing this board correctly.

Know How to Diagnose This Before You Need a Spare

Since this unit is likely destined for a spares shelf, it's worth understanding the DCFB's failure signature in advance, because it can look exactly like an SDCC or LDCC fault. The DCFB's /PSEN signal on 2PL goes TTL-low when its +5 VDC output is properly regulated, and switches high – forcing an SDCC/LDCC microprocessor reset – the moment that 5 V rail sags. A drive or exciter that resets on its own is often telling you about the DCFB's power supply rather than the drive control card's logic. Before condemning either board:

• Check the DCFB's onboard fuse indicators first. 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 feeding the SDCC/LDCC before assuming its logic has failed.
• Don't assume repeated failures mean bad boards. Experienced technicians on Mark V/EX2000 systems consistently find that when the same card position keeps failing, the actual cause is a field device, wiring, voltage, or current problem downstream – not a run of defective replacements.
• Consider the companion card too. There are documented cases of a DCFB and its companion LDCC card failing together where the real fault traced to a failing capacitor on the LDCC, not the DCFB. Since GE never released full schematics for this card generation, an experienced repair shop with card-level test equipment is often the quickest way to a confirmed diagnosis.

Reading DS200DCFBG1BLC

DS200 is the board series prefix, DCFB is the Power Supply Board acronym, G1 is this board's product grouping, and BLC is the specific functional and artwork revision combination. GE's manual reference for this board is GEI-100028. We have not found a documented functional split between G1 and G2 DCFB groups, so treat the group letter as a hardware revision marker and always match the full suffix on the card you are replacing.

Related Boards and Longer-Term Alternatives

The DCFB pairs with the SDCC (or LDCC on EX2000) drive control card and the panel's TCPS power supply. If your site is considering a platform migration, see our Mark V vs Mark VI: DS200 to IS200 guide. For how GE builds its Speedtronic part numbers, see the GE Speedtronic Part Number Decoder, and for the DCFB's place in the DS200 lineup, see GE Mark V DS200 Boards Explained.

What to Send With Your Quote Request

• The complete part number and suffix, e.g., DS200DCFBG1BLC
• A photo of your existing card's label
• Turbine/generator model, and whether this feeds an EX2000 exciter or an AC2000/DC2000-family drive
• Quantity
• Whether this is for stock or an active requirement

Request a Quote

This DS200DCFBG1BLC is new-surplus, factory-packaged stock with a 1-year warranty (see below). Pricing isn't published online since these quotes depend on exact revision availability – submit a Request a Quote and expect a reply within 24 hours. We ship worldwide DDP, accept purchase orders, and support both spares planning and urgent downtime orders.

General Information about the Product
Part Number	DS200DCFBG1B Mark V DS200
Description	DS200DCFBG1B By GE DS200DCFBG1BLC AC2000 DC2000 Power Supply Board NSFP
Condition	newSurplusFactoryPackage With 1 Year Warranty.