IS215ACLEH1A: The Processor Behind EX2100 Field Regulation

Marked for EX2100 duty, the IS215ACLEH1A is the Application Control Layer (ACLE) module — the microprocessor board that turns voltage-regulator commands into controlled generator field current through GE's EX2100 excitation hardware. It is the master controller of the exciter, built on the IS200/IS215 platform used across GE Speedtronic Mark VI systems, and this listing covers the H1A variant at the H1AC revision.

Racks, Backplanes and the DSPX Link

The ACLE spans two slots and installs in the standard EX2100 control racks. Depending on the exciter architecture, that means a simplex thyristor control rack (IS200ESBP backplane), an IS200EBKP warm-backup thyristor control rack, a simplex regulator rack (IS200ERBP backplane), or a redundant regulator rack (IS200ERRB backplane). The module is a two-board sealed assembly — an IS200ACLE carrier board and a plug-in PC/104-Plus processor board — and it partners with the IS200DSPXH1 DSPX signal-processor board. The two communicate across the backplane through 32-bit dual-port RAM: the ACLE runs the regulator application while the DSPX manages the high-speed thyristor firing. Configuration lives in non-volatile compact flash, and the application is downloaded from the toolbox over the ENET1 Ethernet port.

Where the Fault Really Lives: Checks Before a Swap

Excitation trips and controller-failed indications frequently trace back to something other than the ACLE. Because a replacement controller is a significant part, isolate the fault before you order:

• Configuration mismatch. The ACLE validates its toolbox configuration against the hardware at power-up; a wrong or partially loaded configuration halts the exciter while the board itself is fine.
• Runtime and flash. An interrupted runtime download or corrupt compact-flash image can prevent startup. Re-download before condemning the module.
• DSPX and firing path. A problem on the IS200DSPXH1 or in the gate-drive chain can raise an alarm that looks like an ACLE fault.
• Power and seating. A weak EX2100 supply rail or a poorly seated card in the ESBP, ERBP, ERRB or EBKP backplane behaves like a failed processor.
• Communications. Lost toolbox connectivity — check the 336A3582P1 serial cable and the Ethernet link — can masquerade as a hung controller.

When those are clear and the board is genuinely faulted, a matched replacement is the right call.

Making Sense of the Suffix

The number breaks into IS215 (Mark VI / IS200 special assembly), ACLE (the module type), H1A (hardware variant) and a trailing revision letter — the "C" in H1AC. Revisions within a variant are usually interchangeable, but because processor-board content has changed over the ACLE's production life, the dependable approach is to match the complete suffix on your label. Our GE Speedtronic Part Number Decoder shows exactly what each field means.

Adjacent GE Control Boards

Alongside the ACLE you may be sourcing the IS200DSPXH1 DSPX or one of the EX2100 backplanes above; the ACLE is also the replacement for the earlier ACLA module. Browse related inventory in our GE Mark VI IS200 Boards and GE Speedtronic Turbine Control Boards collections.

Getting a Quote for the IS215ACLEH1A (H1AC)

Give us the full part number and suffix (IS215ACLEH1A / H1AC), the revision, a photo of the board label, your EX2100 or EX2100e system and the machine it excites, the ControlST or toolbox version if you have it, the quantity, and your required timing. The governing GE manual is GEI-100584.

Request a Quote and expect a response within 24 hours. We ship worldwide on DDP terms and gladly accept purchase orders.