IS200AEADH1AAA: I/O Grid Fork Duty in GE's Wind Platform

Wind turbine control cabinets are full of boards that announce their failures with LEDs and alarm codes. The IS200AEADH1AAA is not one of them. This is GE's Input/Output Grid Fork board from the AEAD family, a part that GE Energy's functional catalog assigns to the Mark VIe wind turbine control line — the Speedtronic-derived platform used for wind units and their balance-of-plant systems. Its job is unglamorous and essential: terminate wiring, switch signals through its onboard relays, and hand clean I/O between the turbine's control electronics and the hardware in the field.

The AA suffix on this unit marks an early revision of the H1A hardware group. It is offered here in used condition, cleaned and tested, with the specifics listed in the table at the end of this page.

A Board With No Status LEDs: Diagnosing by Elimination

Nothing on the AEAD lights up to say it is unhealthy, so the diagnosis happens with a meter and a methodical sequence. The failure that looks like this board but is not usually lives at the terminations or upstream of the module:

• Start with the terminal strips. The board terminates field wiring on three twelve-pin strips plus stab-on and plug connectors. In a tower base or nacelle cabinet that vibrates through every start and gust, a loosened termination is the most common imposter for a dead I/O channel. Reseat and retorque before you suspect silicon.
• Map the failure pattern. One bad channel with its neighbors healthy is compatible with a board fault — or one bad termination. Every channel dead at once almost never means the board died wholesale; check the module's power feed and the cabling back to the controller first.
• Interrogate the relays. Relay contacts wear; coils rarely half-fail. If a relay pulls in audibly but the circuit stays open, contact wear on the board is a fair verdict. If the coil never energizes, prove the command signal is arriving before blaming the relay.
• Respect the coating. The board is conformally coated. Improvised field repairs through the coating tend to create the next fault — if the board is genuinely bad, replace it and have the failed unit evaluated properly.

Hardware Layout of the H1A Group

Physically, the H1A is a rectangular printed circuit board with no faceplate and no VME hardware — it mounts in a cabinet on its corner holes rather than sliding into a control rack. Along one edge runs a right-angle connector; across the board sit two heat sinks, a grouped bank of eight relays, wire-wound and standard resistors, capacitors, and the interface logic. Every component position carries a reference designator on the base plate, which helps when you are comparing a suspect board against a replacement on the bench.

Suffix and Revision: What AA Tells You

Break the number apart: IS200 (GE control board of the Mark VI/VIe hardware era, standard assembly) + AEAD (the Input/Output Grid Fork function) + H1A (hardware configuration group) + AA (revision). Two things matter when ordering. The H-group must match — AEAD also ships as H3A and H4A input terminal board variants, and they are not substitutes for an H1A. The revision letters track design updates; an AA board is an early-revision unit, and whether a later revision (BA, CA) is acceptable in your slot is a question for your site records or OEM documentation, not an assumption. Our GE Speedtronic Part Number Decoder covers the general IS200 numbering logic if you want the full breakdown.

One honest note on catalogs: because of that IS200 prefix, distributors routinely shelve AEAD boards under Mark VI headings, and you will find this family filed both ways across the surplus market. The functional listings tie the acronym to the Mark VIe wind series, so verify against your own system documentation — and when in doubt, a label photo settles it.

What to Put in Your RFQ

• Full part number with revision — IS200AEADH1AAA, not just IS200AEADH1A
• A clear photo of the board label
• The turbine model or BOP system the board serves, and the control generation from your records
• Quantity needed, plus any interest in a shelf spare
• Urgency — turbine down now versus planned maintenance window
• Condition preference: this listing is a cleaned-and-tested used unit; tell us if you need new surplus instead

Quote Turnaround, Shipping, and POs

Send the details through the Request a Quote button and you will have an answer within 24 hours. We ship worldwide under DDP terms — duties and customs handled, one landed figure — and we accept purchase orders. If you are auditing the rest of your spares, the GE Mark VI IS200 Boards collection and the full GE Speedtronic Turbine Control Boards catalog are the places to start.

General Information about the Product
Part Number	IS200AEADH1A Mark VI IS200
Description	IS200AEADH1A By General Electric IS200AEADH1AAA Input/Output Grid Fork Board
Condition	used Cleaned and Tested. With 1 Year Warranty