Platform and purpose of the UPSA

Processors fail from events; power supplies fail from age. Electrolytics dry out, switching components fatigue, and one morning the cabinet does not wake up. That is the argument for this listing: a new-surplus, factory-packaged DS200UPSAG1A, the DS200-series power supply board GE fielded with its EX2000 excitation systems and — under its UC2000 designation — with the reusable controller platform of GE's Innovation Series drive era. Republished GE-era documentation describes the UPSA as a two-stage off-line switching design that takes an AC or DC line input and produces the control-level voltages the rack runs on. The board comes from GE's Salem, Virginia operation, like the rest of the DS200 range that populates Speedtronic Mark V plants.

Why power supplies deserve a shelf spare

A control power supply is a single point of failure with a long procurement tail: OEM production ended long ago, and its failure mode — no control power — is the one that stops everything at once. Sites running EX2000 exciters alongside Mark V turbine control hold a spare supply per cabinet type for exactly this reason, and factory-packaged surplus is the preferred grade for the role: unfielded hardware, original packaging, stored rather than cycled.

A note on scope, because the DS200 catalog spans both sides of the plant: the UPSA is not the supply inside your Speedtronic Mark V control cores — those racks are fed by DS200TCPS boards and the panel's power distribution hardware. If your symptom is a dark Mark V core rather than a dark exciter or drive cabinet, start there instead; the board families are sorted out in GE Mark V DS200 Boards Explained.

Confirm the fault before the swap

When the day comes, do not let the spare shortcut the diagnosis. Confirm the incoming feed at the cabinet before condemning the conversion stage. Check the three onboard fuses — and if one is open, find the downstream reason before energizing the replacement into the same fault. Use the board's reset button and LED indication to gather evidence while the cabinet is still in its failed state. And respect stored charge: allow the capacitors time to discharge after power-down — guidance published for this part calls out roughly a 30-second wait — before touching the board. A replacement supply installed into an undiagnosed short is how one outage becomes two.

Revision letters on this listing

DS200UPSAG1AFD parses per GE's DS-series scheme: DS (Salem, Virginia origin), 200 (base-level board; 215 would flag a higher-level assembly), UPSA (functional acronym), G1 (group), A (non-backward-compatible functional revision — the catalog number is therefore DS200UPSAG1A), then FD as the backward-compatible functional and artwork revision tail. Sister labels you may find on installed boards include DS200UPSAG1ADB and DS200UPSAG1AGD; the catalog base is the same. Our GE Speedtronic Part Number Decoder walks through the scheme — or photograph the label and let us do the parsing.

What we need from you

1. The full part number of the board in service, tail included.
2. A label photo.
3. Host equipment: EX2000 exciter cabinet, drive controller, or other — plus the plant's control platform (Mark V Simplex or TMR, Mark V LM, or later).
4. Whether this is a live failure or a planned spare.
5. Quantity and required date.

Quotes in 24 hours

Condition: new surplus in original factory packaging, with a one-year warranty, per the table below. Hit Request a Quote and our reply lands within 24 hours with availability and lead time. Worldwide DDP shipping; purchase orders accepted. Related DS200 hardware is collected in GE Mark V DS200 Boards.