GE Mark VI ISBus Board | IS200EISBH1AAA Fiber-Optic

The General Electric IS200EISBH1AAA is a specialized Exciter ISBus communication board designed for the Speedtronic Mark VI and EX2100 excitation control systems. This board serves as a critical fiber-optic communication interface, facilitating data exchange between controllers and field devices for precise generator excitation management.

Core Technical Specifications

• Brand & Model: General Electric IS200EISBH1AAA
• Series: Speedtronic Mark VI / EX2100 Excitation Control
• Board Type: Exciter ISBus Communication Board
• Form Factor: Single-slot, 3U-high VME module.
• Dimensions (HxW): 8.26 cm x 4.19 cm.
• Analog Channels: 12 channels with 4-20 mA input span.
• Operating Temperature: -30°C to +65°C.

Primary Functions & Communication

• Core Role: Communication interface for M1, M2, and C controllers within the EX2100 exciter system.
• ISBus Protocol: Utilizes GE's proprietary ISBus for high-speed data transfer between exciter controllers.
• Fiber-Optic Interface: Features 6 front-panel fiber-optic connectors for receiving and transmitting variable frequency signals.
• Signal Handling: Manages generator field DC voltage/current, exciter voltage/current (optional), and ground detector signals.
• RS-232C Interface: Provides communication between the DSPX controller and tool/keypad ports via the backplane.

Physical Design & Integration

• Mounting: Located in the control rack beneath the DSPX controller in a single VME slot.
• Front Panel: Includes six fiber-optic connectors, a reset switch access port, and is marked with the GE logo and board ID.
• Connectors: Equipped with one backplane connector (P1) for integration.
• Construction: Built with surface-mount technology and conformal coating for protection.

Signal & Electrical Specifications

• Input Span: 4-20 mA analog input signals.
• Common Mode Voltage: ±5 V range.
• Maximum Lead Resistance: 15 Ω.
• Analog Output: Capable of 0-20 mA output current.

System Compatibility & Documentation

• Compatibility: Integral part of GE's Speedtronic Mark VI and EX2100 control systems for gas, steam, and wind turbine excitation.
• Revision History: Has a total of 3 functional revisions. The first two revisions are backwards-compatible.
• Manual Reference: Detailed information is available in GE Manual GEI-100454.

Frequently Asked Questions (FAQ)

What is the main purpose of the ISBus on this board?

The ISBus (GE's proprietary communication interface) enables high-speed, reliable data exchange between the redundant exciter controllers (M1, M2, C) and the DSPX. This synchronization is critical for stable and redundant control of the generator's excitation field.

What types of signals connect via the fiber-optic ports?

The fiber-optic ports primarily carry isolated analog feedback signals for generator field voltage and current, optional exciter signals, and ground fault detection data from the EDCF (Exciter Diagnostics and Control Fiber) boards.

Where is this board physically located in the system?

It is installed in a VME slot within the main control rack, typically positioned directly underneath the DSPX (Digital Signal Processor X) controller board for direct backplane communication.

What does the reset switch on the front panel do?

The reset switch allows for a manual hardware reset of the ISBus communication interface. This can be used to re-initialize the board's communication logic in case of a software hang or lock-up, restoring data flow without a full system power cycle.

How do I know if this board is compatible with my system?

Verify your system is a GE Speedtronic Mark VI or EX2100 excitation system. Check the existing board's part number and revision level. The IS200EISBH1AAA is backwards-compatible with the first two revisions of its series, but always consult system documentation or a GE specialist for confirmation.