IS215ACLAH1AD: The Application Control Layer Module in the EX2100 Exciter

The IS215ACLAH1AD is a GE Application Control Layer (ACL) module from the EX2100 excitation control system — not a gas-turbine controller. It shares the Innovation Series IS200/IS215 hardware platform used by Mark VI Speedtronic, but the ACLA belongs to the generator excitation side of the plant, where it acts as the microprocessor-based master controller for the exciter. It manages the outer regulating loops and carries communication traffic over Ethernet and the ISBus network. It is an older-generation design, using a PCI/ISA bridge architecture that predates the newer ACLE.

Inside the EX2100, the ACL board mounts in the exciter board rack on the Exciter Backplane (EBKP); in Innovation Series drive applications the same module plugs into the Control Assembly Backplane through its P1 connector. It occupies two half-slots and sits next to the DSPX digital-signal-processor board, exchanging data with the DSPX so the regulator can act on measured generator conditions. The outer loops it supervises are the ones an excitation engineer knows well: automatic voltage regulation (AVR), the power system stabilizer (PSS), the under-excitation limiter (UEL) and VAR/power-factor (VAR/PF) control. It also provides the exciter's Ethernet link to the operator HMI, the LCI and the turbine control.

Confirm the Fault Is the ACL Before You Order

Excitation trips are expensive and the ACL is rarely the first thing that actually failed. Before you commit to a replacement board, rule out the look-alikes:

• Configuration and firmware. A board that boots but will not regulate is often carrying the wrong application code or a firmware/EEPROM mismatch after a prior swap. Load and compare the configuration in the toolbox before condemning the hardware.
• The DSPX and backplane. Because the ACL trades data with the DSPX across the P1 bus and the backplane, a fault on the DSPX, the EBKP backplane, or a reseated connector can present as an “ACL” alarm. Check the neighbor and the seating first.
• The field and power side. Loss of field, an SCR/bridge problem, a blown fuse, or a sagging control-power feed can mimic a dead regulator. Confirm the module is actually powered and that the exciter power stage is healthy.
• Communications. If the symptom is lost Ethernet to the HMI, LCI or turbine control, verify the network path and cabling before assuming the port on the board is bad.

EX2100 systems are built in both simplex and redundant control arrangements. If yours is redundant, identify which controller channel actually flagged the fault rather than replacing both. Work the diagnostic alarms against the GEH-6632 EX2100 user guide and the GEI-100434 instruction manual before pulling a board.

Reading IS215ACLAH1A, the H1A Group and the Final Suffix

The number breaks down as the assembly designator (IS215), the functional acronym (ACLA), a hardware group (H1) and a revision letter — here the D in IS215ACLAH1AD. The base board carries the catalog number IS200ACLAH1A; the IS215 number is the higher-level, coated assembly built from it. The trailing letter tracks the artwork/revision of that assembly, so the safest approach is to match the full string on your board label, then let us confirm whether a nearby revision is a valid drop-in for your exciter build.

ACLA, ACLI and the Newer ACLE

GE built the ACL in more than one I/O configuration. The ACLA carries one 10BaseT Ethernet port plus two serial COM ports and is the version used in the EX2100; the ACLI adds two ISBus ports. The later ACLE (IS215ACLE…) is the successor generation — a higher-level assembly with a newer processor and two faceplate Ethernet ports, used on EX2100e-era exciters. An ACLE is not a like-for-like drop-in for an ACLA slot, so keep the two straight when you source spares. You can decode any of these strings with our GE Speedtronic Part Number Decoder, and browse related boards on the shared IS200/IS215 platform in our GE Mark VI IS200 Boards collection.

What to Send With Your Quote Request

To make sure you receive the correct exciter board the first time, include:

• The full part number with its suffix (IS215ACLAH1AD) and the revision printed on the board label — a clear photo of the label helps.
• Your exciter model (EX2100 or EX2100e) and whether the control is simplex or redundant.
• The companion boards in the rack, such as the DSPX, if you are matching a set.
• Quantity needed and how urgent the outage is.

Request a Quote on the IS215ACLAH1AD

This IS215ACLAH1AD is offered as new surplus, factory packaged, open box, backed by a one-year warranty. Tell us your exciter model and the revision you are matching and we will confirm availability from stock. We return quotes within 24 hours, ship worldwide on DDP terms, and accept purchase orders from qualified operators and EPCs. Use the Request a Quote button to get started.

General Information about the Product
Part Number	IS215ACLAH1A Mark VI IS215
Description	GE General Electric IS215ACLAH1A IS215ACLAH1AD PCB Mark VI OPEN BOX
Condition	newSurplusNoBox Factory Packaged. With 1 Year Warranty.