The DS200TCPS in the Mark V Power Architecture

This DS200TCPSG1AHC is the DC input power supply from the GE Speedtronic Mark V, the card that powers a single control or I/O core. It takes in the panel's 125 VDC bus and regulates it into the rails the core electronics run on: the +5 VDC logic supply, adjusted at the board with a potentiometer, together with the analog and servo rails commonly documented as ±15 VDC and ±24 VDC. Because it is the power source for a whole core, its condition affects everything that core does.

The board is DC-fed — the reason "DC Input" appears in its name. Its 125 VDC is provided by the TCPD power-distribution board in the <PD> core, and it will not operate on AC, so an AC-only site must add a <DACA> converter to create the 125 VDC. The Mark V uses one supply per core, giving a TMR panel independent boards in <R>, <S> and <T> plus the <C> and I/O cores, so redundancy is preserved at the power level as well as the processing level.

Diagnose the Supply, Not Just the Board

Before you replace a TCPS, make sure you are looking at a board fault and not one of the faults that impersonate it. The Mark V gives you several ways to confirm that cheaply:

• Check the 125 VDC input at the board first. A tripped source, a lost <DACA> output, or an AC-only feed without a converter will make a healthy board look dead.
• Measure the rails at the silkscreened test points with a recently calibrated meter, or read them from the DIAGC display. An out-of-calibration meter has caused technicians to mis-adjust the +5 VDC rail and produce intermittent faults that mimic a failing supply.
• If several cores report the same rail low at once, look for a grounded device on the shared 24 VDC bus before you assume that multiple supplies failed together.

The TCPS does fail on its own — it runs warm and can grow noisy with age, and it is one of the boards that gets replaced over a Mark V's life. But verifying the input and the shared bus first means the money goes toward the board that is actually the problem.

The DS200TCPSG1AHC Revision

This board is a DS200TCPSG1A, full number DS200TCPSG1AHC. Read across, that is DS200 (Mark V board series), TCPS (DC-input power-supply function), G1 (group — the supply is normally supplied as group 1) and AHC (revision). Revision tails such as AHC, AME, APE and ARE mark successive versions of the same board, so match the revision your panel was built with or confirm that a newer one supersedes it before fitting. The GE Speedtronic Part Number Decoder explains each field, and the number should be read from the board's silkscreen rather than the rack marking.

Boards Powered From the Same Distribution

The TCPS is one node in the Mark V power scheme. Its 125 VDC arrives from the TCPD board in the <PD> core, and the cards it powers include the core's processors and the familiar Mark V I/O — boards such as the TCDA digital I/O and the TCQA analog I/O. See the GE Mark V DS200 Boards Explained guide for how the group interconnects, and the GE Mark V DS200 Boards collection for what is in stock. For a view across generations, Mark V vs Mark VI: DS200 to IS200 covers the transition to the IS200 platform.

What to Tell Us for an Accurate Quote

• The full part number and revision (DS200TCPSG1AHC), from the board.
• A photo of the label and silkscreen.
• Turbine model and Mark V architecture (Simplex or TMR).
• The core the supply serves.
• Quantity and how soon you need it.

Request a Quote for the DC Supply

This DS200TCPSG1AHC is new surplus, supplied as an open box, cleaned and tested, with a one-year warranty. Send the details above through the Request a Quote button and we will reply within 24 hours with availability and lead time. We ship worldwide DDP and accept purchase orders.