GE IS200EAUXH1A IS200EAUXH1AAA | Excitation Control Board

Core Function and System Role

The GE IS200EAUXH1A manages generator excitation for Mark VI systems. Specifically, this board executes voltage regulation and power factor control. Moreover, it communicates with exciter firing boards via high-speed links. The IS200EAUXH1AAA variant includes extended memory for complex excitation algorithms.

Technical Specifications Overview

This excitation control board features a 32-bit CPU running at 150 MHz. The board includes 2 MB of SRAM for program execution. Furthermore, it provides 4 MB of flash memory for non-volatile storage.

Parameter	Specification
Part Number	IS200EAUXH1A / IS200EAUXH1AAA
Type	Excitation Control Board / Generator Field Regulator
Processor	32-bit RISC CPU
Clock Speed	150 MHz
SRAM	2 MB
Flash Memory	4 MB (8 MB for AAA variant)
Analog Inputs	8 Channels, 16-bit, ±10 Vdc
Analog Outputs	4 Channels, 16-bit, ±10 Vdc
Communication Ports	2 x Ethernet, 2 x RS-485
Backplane Interface	VME 96-pin Connector
Logic Power	5 Vdc from Backplane
Battery Backup	Lithium Coin Cell (3 Vdc)
Dimensions (W x H x D)	233 x 160 x 20 mm
Weight	0.55 kg
Onboard Energy Storage	10 x 100 µF, 16V Capacitors

Connector Layout and Component Count

The board uses one 96-pin VME connector for backplane communication. For instance, this interface carries data, address, and power lines. Meanwhile, front panel ports provide two Ethernet and two RS-485 connections. The IS200EAUXH1AAA adds an extra 4 MB flash memory chip.

Energy Storage and Processing Stability

This control board includes local decoupling for stable processor operation. Specifically, ten 100 µF capacitors filter the 5 Vdc backplane supply. Therefore, the board maintains reliable execution during transient loads. Additionally, onboard LED indicators show power and activity status. For example, a green LED confirms proper logic power. A yellow LED flashes with each control loop iteration.

Diagnostic Features and Self-Testing

The board continuously runs background self-tests on all memory banks. Consequently, it detects ECC errors within one millisecond. Moreover, the GE IS200EAUXH1A IS200EAUXH1AAA includes a hardware watchdog timer. This feature resets the processor if the software execution stops. An onboard status register reports all diagnostic results to external systems.

Maintenance and Firmware Updates

You can update the board firmware through the Ethernet port. Thus, you avoid removing the board for software changes. The board stores its operating system in flash memory. Therefore, firmware persists through power cycles and board replacements. A battery-backed real-time clock maintains schedule data during power loss.

Industrial Applications

This excitation control board works inside GE Mark VI excitation panels. For reliable GE generator field regulation, the IS200EAUXH1A and IS200EAUXH1AAA deliver exceptional performance. They provide precise voltage control for steam and gas turbine generators.