GE IS400 Modules: IS400AEBMH1AJD Fuji Protection Board

Technical Dossier

Product Details And Specifications

GE IS400 Series Technical Notes

The GE IS400 series represents a core hardware platform deployed across GE's Mark VI Turbine Control System and EX2100 Excitation Control System. These modules are installed in critical heavy-industry environments including petrochemical refineries, nuclear power stations, combined-cycle gas turbine plants, and offshore oil & gas facilities worldwide. The IS400 designation covers a broad range of I/O boards, protection modules, communication adapters, and power supply cards that form the backbone of GE's distributed control architecture. Due to the long operational lifecycles typical of turbine control infrastructure (15–30 years), IS400 series components remain in active demand for both maintenance and emergency replacement well beyond their original production runs.

The Evolution of IS400 Architecture

The IS400 platform was introduced as part of GE's transition from the earlier Mark V control system to the Mark VI architecture in the mid-1990s. Mark V relied on the IS200 and IS215 board families; the IS400 series introduced a higher-density, VME-bus-compatible form factor with improved noise immunity suited for high-voltage generator environments. Early IS400 modules used parallel backplane communication; later revisions incorporated serial IONet (Ethernet-based) connectivity, enabling integration with GE's Toolbox configuration software. The IS400 series is mechanically and electrically distinct from the IS200 and IS215 families and is not directly interchangeable without system-level reconfiguration. As GE transitioned toward the Mark VIe platform (IS420 series) in the 2010s, IS400 production was progressively discontinued, placing the entire series in end-of-life status. Operators running Mark VI systems must now source IS400 spares through specialist distributors, as OEM availability is severely limited.

IS400 Full Catalog & Functionalities (SKU List)

The following SKUs represent verified IS400 series modules categorized by function. Each entry reflects a distinct hardware assembly used within the Mark VI or EX2100 control architecture.

Protection & Excitation Boards

• IS400AEBMH1AJD: Fuji protection board for EX2100 excitation control, overvoltage/overcurrent trip logic
• IS400AEBMH1BJD: Fuji protection board variant B, revised trip threshold configuration for EX2100
• IS400AEBRH1A: EX2100 excitation regulator board, AVR function with field current feedback
• IS400AEBSH1A: EX2100 signal conditioning board, analog input scaling for generator feedback signals
• IS400AEBTH1A: EX2100 thyristor firing board, SCR gate pulse generation for bridge rectifier control

I/O Modules — Analog Input (AI)

• IS400ATIIH1A: Analog input terminal board, 16-channel 4–20 mA / ±10 V process input
• IS400ATBAH1A: Analog terminal board, thermocouple and RTD input conditioning for turbine temperature monitoring
• IS400ATBCH1A: Analog terminal board variant C, high-speed analog input for vibration and flux signals

I/O Modules — Digital Input (DI)

• IS400TTURH1A: Turbine trip relay terminal board, hardwired trip logic interface for Mark VI protection
• IS400TSVOH1A: Servo output terminal board, ±10 V / 4–20 mA valve actuator drive
• IS400TBCIH1A: Contact input terminal board, 24 VDC discrete input for turbine auxiliary status signals
• IS400TBCOH1A: Contact output terminal board, relay-driven discrete output for turbine control commands

Communication & Processor Modules (CPU)

• IS400GFOIH1A: Fiber optic interface board, IONet redundant communication link for Mark VI controller
• IS400GFOIH2A: Fiber optic interface board revision 2, enhanced EMI shielding and extended temperature range
• IS400VCMIH1A: VME communication module, backplane interface for Mark VI R, S, T controller triplex voting

Power Supply Modules

• IS400PSNIH1A: 28 VDC power supply board, regulated DC rail for IS400 I/O backplane distribution
• IS400PSNRH1A: Redundant power supply board, hot-standby failover for critical Mark VI power rails

Quality Control for the IS400 Range

IS400 series modules present specific test challenges due to their VME backplane architecture, fiber optic communication interfaces, and high-voltage proximity in excitation applications. DriveKNMS applies the following verification procedures to all IS400 units prior to dispatch: visual inspection of PCB traces, connector pins, and conformal coating integrity; powered functional test using a Mark VI-compatible backplane simulator to verify IONet communication handshake; analog channel calibration verification for AI terminal boards against NIST-traceable reference signals; protection board trip logic verification for IS400AEBMH1AJD and related Fuji protection assemblies using simulated fault injection; and dielectric withstand testing for boards rated for high-voltage excitation environments. Units that do not pass all applicable test stages are quarantined and not offered for sale.