DS200PCCAG1A: The Link Between the Command Signal and the Thyristor Bridge

Rather than living in the R/S/T/P logic cores of the Mark V panel, the DS200PCCAG1A works inside the power converter — typically the generator's static exciter or a DC drive on the turbine train. Its job is to translate the firing command coming from the control electronics into gate pulses for the SCR (silicon-controlled rectifier) bridge, usually via pulse transformers. If your question is "which Mark V core does this board sit in," the honest answer is: none — it lives in the power cabinet, not the I/O rack.

Why the G1 Group Matters

The PCCA family splits into several groups (G1, G2, G5, G6, G7, G8, G9, G10...), and each corresponds to its own combination of armature voltage range, presence or absence of a snubber, and fuse type. Specialized suppliers describe the G1 group as a regenerative version of the board; we haven't been able to confirm that detail independently against a GE manual, so treat it as third-party reference, not a guarantee of compatibility. What matters in practice: don't swap a PCCA from one group for one from a different group without validating against the old board's label.

The Symptom That Looks Like PCCA — But Isn't

Firing failure on the SCR bridge, overheating, or an overcurrent trip on the converter tend to get pinned on the PCCA right away — but the board is just one piece of the firing path. Before requesting a replacement, it's worth ruling out:

• The thyristors (SCRs) themselves and their firing cables — a shorted or open SCR produces symptoms nearly identical to a burned-out PCCA.
• The four configurable jumpers (JP1, JP2, WP3, WP4) — these select the armature voltage range and the snubber/voltage-feedback configuration. A replacement board with jumpers set wrong for your application will fail the same way the old one did.
• The capacitors and resistors of the snubber circuit, where present on the board — a degraded snubber produces the same voltage spikes as a PCCA fault.
• The power supply feeding the assembly — a sag or noise on the supply can be mistaken for a failure of the interface board.

Reading the Label: DS200PCCAG1A vs. DS200PCCAG1AAA

DS200PCCAG1A is the base number (DS200 family, PCCA function, G1 group); DS200PCCAG1AAA is the full revision stamped on the physical board. Always provide the complete reference, with the suffix, when requesting a quote — the base number alone can match more than one revision in stock.

This Unit

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

What to Include in Your Quote Request

• Full part number, including revision suffix (a photo of the label helps)
• Turbine and converter/drive where the board is installed
• Mark V Simplex or TMR
• Quantity and urgency

Request a quote using the Request a Quote button — we respond within 24 hours, with worldwide DDP dispatch and purchase orders accepted.

• GE Speedtronic part number decoder
• GE Mark V DS200 collection