IS200HFPAG2ADB: The Mark VI High-Frequency AC/Fan Power Supply

The IS200HFPAG2ADB is a member of GE's Speedtronic Mark VI IS200 board family, built to work as a high-frequency AC and fan power supply inside gas- and steam-turbine control cabinets. Unlike the VME logic cards it shares a cabinet with, this board does not process turbine control signals. Its job is power: it takes the incoming cabinet supply and converts it into the low-voltage rails the control section needs, and it drives the cooling fans that keep rack temperatures under control. When a Mark VI lineup runs hot or loses a control-power rail, the HFPA is one of the first components a technician should evaluate.

Inputs, outputs, and what is on the board

The HFPA accepts either an AC or a DC input at its four stab-on input connectors and converts it into the output the cabinet requires. Documented outputs for this board include 48 VAC, 52 VAC, 48 VDC, and 17.7 VAC, delivered through eight output plug connectors, with the combined output rated not to exceed 90 VA. On the board you will find two transformers, two heat sinks, three high-voltage capacitors, a metal-oxide varistor for transient suppression, four fuses for circuit protection, and two LEDs that report the status of the voltage outputs. The board is normally mounted in the drive cabinet near a board rack or a fan enclosure rather than in the VME card rack itself.

Diagnose before you buy: is the fault really the HFPA?

Because the HFPA is a power-conversion and fan-supply board, its failure symptoms overlap heavily with problems that have nothing to do with the board. Work through these checks before you order a replacement:

• Read the two output LEDs first. They indicate the status of the voltage outputs. A dark output LED with good input present points at the board or a blown fuse; no input at all points upstream at the feed or breaker.
• Check the four fuses. A single open fuse can drop one rail or one fan feed and look exactly like a dead board. A shorted load, such as a seized fan or a chafed fan cable, will re-open the fuse as fast as you replace it, so clear the short rather than only swapping the fuse.
• Trace the fan, not just the supply. A cabinet over-temperature alarm or a fan that will not spin is frequently the fan motor, its connector, or the harness. Confirm the fan and its wiring before condemning the HFPA.
• Watch for knock-on effects. If cooling or control power is marginal, other cards in the rack can raise seemingly unrelated faults. A cluster of "random" rack alarms sometimes traces back to a struggling power and fan supply, not to the logic boards reporting the alarms.

Working through the input feed, the fuses, the LEDs, the fans, and the wiring first will tell you whether you genuinely need a replacement IS200HFPAG2ADB or whether the real fault sits elsewhere in the cabinet.

Reading the IS200HFPAG2ADB part number

The string follows the standard Speedtronic pattern. IS200 marks the Mark VI IS200 printed-circuit-board series, HFPA is the functional acronym for the high-frequency AC/fan power supply, G2 identifies the functional group, and the trailing characters (the A revision plus the DB suffix) denote the hardware and artwork revision along with the coating variant. Treat the group and suffix as a matching requirement: order the group and revision your cabinet was built with rather than assuming any HFPA will drop in. Our GE Speedtronic Part Number Decoder walks through each segment of the code.

Related Mark VI boards and where to look next

The HFPA works alongside the rack backplane and the VME control and I/O cards it helps power and cool. If you are mapping a cabinet or planning a spares kit, browse the full GE Mark VI IS200 Boards range and the broader GE Speedtronic Turbine Control Boards catalog. If you also support older Speedtronic lineups, our Mark V vs Mark VI: DS200 to IS200 guide explains how the power and control hardware changed between generations.

What to include in your quote request

To make sure you receive the correct board the first time, send us:

• The full part number with suffix (IS200HFPAG2ADB) and any revision letters printed on the label
• A clear photo of the board label
• The turbine model and the Mark VI cabinet it serves
• Quantity required, and whether this is a planned spare or an active outage

Request a quote

This IS200HFPAG2ADB is offered as a used, cleaned-and-tested board backed by the warranty shown below. Click Request a Quote and our team responds within 24 hours. We ship worldwide on a DDP basis and accept purchase orders from qualified organizations. Tell us your urgency and we will confirm availability and lead time for your IS200HFPAG2ADB.