IS200HFPAG1ACB in the Speedtronic Mark VI Power Chain

The IS200HFPAG1ACB is the G1-group build of GE's Mark VI HFPA, the high-frequency AC and fan power supply that energizes a Speedtronic control cabinet and keeps it cool. It is easy to overlook a power-supply board when a turbine misbehaves, but a weak or dead HFPA can starve the fans and control rails that every other card in the lineup depends on. Understanding what this board delivers is the fastest route to deciding whether it is the cause of a fault or an innocent bystander.

Rails, fuses, and fan feeds

This board converts an AC or DC input, landed on four stab-on input connectors, into the outputs the cabinet uses: documented values are 48 VAC, 52 VAC, 48 VDC, and 17.7 VAC, distributed through eight output plug connectors, with the total load rated not to exceed 90 VA. The assembly carries two transformers, two heat sinks, three high-voltage capacitors, a metal-oxide varistor for surge clamping, four fuses, and two LEDs that annunciate output status. It is generally mounted in the drive cabinet near a board rack or a fan enclosure, feeding cooling and control power rather than sitting on the VME bus.

Which voltage rail failed, and is the board to blame?

When one of the HFPA outputs disappears, resist the urge to swap the board immediately. Narrow the fault down first:

• Identify the missing rail with the LEDs. The two indicators tell you whether outputs are present. Losing one output while others stay healthy usually points to a specific fuse or output branch, not the whole board.
• Inspect the four fuses. A blown fuse is the single most common cause of a "dead" rail. Replace it only after confirming the downstream circuit is not shorted, because a shorted fan or cable will destroy the new fuse instantly.
• Confirm the input. Meter the stab-on connectors for the incoming supply. No input means the problem is upstream at the feed, wiring, or breaker.
• Consider the heat path. A board that only fails when hot may indicate a cooling deficit in the cabinet rather than a defective converter. Verify the fans it drives are actually turning.

Only after the fuses, the input feed, the LEDs, and the fan loads are cleared does replacing the IS200HFPAG1ACB become the logical next step.

Understanding the G1 group and the ACB suffix

The part number decomposes cleanly: IS200 designates the Mark VI IS200 board series, HFPA is the functional acronym for the high-frequency AC/fan power supply, G1 marks the functional group, and the A revision with the CB suffix indicates the hardware revision and coating variant. Because the group and suffix govern fit and configuration, order the exact combination your cabinet uses. Our GE Speedtronic Part Number Decoder explains how each portion of the string is assigned.

Companion boards and collections

The HFPA is one link in the Mark VI power and cooling chain that supports the rack backplane and the VME control and I/O boards. Explore related parts in the GE Mark VI IS200 Boards collection and the broader GE Speedtronic Turbine Control Boards catalog. If you are transitioning from an earlier platform, our Mark V vs Mark VI: DS200 to IS200 guide outlines how the hardware evolved.

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• The complete part number and suffix printed on the label (IS200HFPAG1ACB)
• A photograph of the board's identification label
• The turbine model and the Mark VI cabinet or unit it supports
• The quantity needed and how urgent the requirement is

Request pricing and lead time

This IS200HFPAG1ACB is a used, cleaned-and-tested board covered by the warranty shown below. Select Request a Quote and we will respond within 24 hours. We deliver worldwide on a DDP basis and accept purchase orders from qualified organizations. Share your deadline and we will confirm stock and lead time for your IS200HFPAG1ACB.