Before Ordering a DS200PCCAG1A, Confirm Where the Problem Actually Is

Maintenance teams often look for the PCCA in the Mark V control rack — alongside TCQA, TCQC, and TCEA — and can't find it, because it doesn't live there. The DS200PCCAG1A sits inside the system's power converter (the SCR bridge), usually the generator's static exciter or a DC drive tied to the turbine train. Before finalizing a quote request, it's worth confirming which physical cabinet the suspect board is actually installed in.

What This Board Does

The PCCA's job is to act as the interface between the control electronics and the thyristor (SCR) bridge: it receives the firing command and converts it into gate pulses, typically through pulse transformers. On low- and medium-power converters, the board itself carries the snubber circuits that absorb voltage spikes on the DC bus, the AC lines, and the gate drivers; on high-power units, those snubbers may be located off the board.

Diagnose Before You Buy

An SCR bridge with a firing failure, overcurrent, or an intermittent trip isn't automatically a burned-out PCCA. It's worth ruling out, in this order:

• Jumpers JP1/JP2/WP3/WP4: these set the armature voltage range and the snubber/feedback configuration. A new board with the wrong jumpers repeats the old board's symptom.
• The SCRs themselves and the firing cabling: an open or shorted thyristor perfectly mimics a PCCA failure.
• Snubber components (capacitors, resistors, diodes): degradation here produces the same voltage spikes typically blamed on the board.
• The power supply feeding the assembly: instability in the supply can present as an interface failure.

Only after ruling out these points does replacing the PCCA make sense as the next step.

What the G1 Group Means

The PCCA family exists in several groups (G1 through at least G10), each with its own combination of voltage range, snubber presence, and fuse type. Specialized suppliers associate the G1 group with a regenerative version of the board; since we haven't independently confirmed that point against a GE manual, we treat it as external reference, not settled fact. In practice, what matters is not mixing groups without validating against the label of the board coming out.

DS200PCCAG1A vs. DS200PCCAG1ADB

DS200PCCAG1A is the base reference; DS200PCCAG1ADB is the full revision stamped on the physical board's label. Always provide the complete code when requesting a quote.

This Unit

Used, cleaned and tested, with a 1-year warranty.

Details for Your Quote

• Full part number with suffix (a photo of the label is very helpful)
• Turbine and converter where the board operates
• Mark V Simplex or TMR
• Quantity and urgency of the outage

Request a quote through Request a Quote: response within 24 hours, worldwide DDP dispatch, purchase orders accepted.

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