IS200EDEXG1BBB | General Electric | Exciter De-Excitation Control Board

Configured for emergency generator field energy dissipation in EX2100e excitation systems, the General Electric IS200EDEXG1BBB (IS200EDEXG1BBB Exciter De-Excitation Control Board) provides direct physical/electrical execution of SCR firing sequences and conduction state monitoring.

Hardware Specifications

Industrial Control and Firmware Integration

The IS200EDEXG1BBB utilizes deterministic network communication to facilitate high-speed de-excitation responses. The board architecture supports firmware flash compatibility, enabling precise timing adjustments for SCR firing angles managed through the EMIO and EXTB interfaces. The module provides I/O density scaling by conditioning status signals from the 41dc contactor or breaker auxiliary contacts. Its control logic supports dual firing commands, ensuring redundant activation of the energy dissipation bridge to maintain system safety. Voltage retention circuits are incorporated to sustain internal monitoring logic during primary power loss events.

Frequently Asked Questions (FAQ)

Q: How is the de-excitation sequence initiated on this board?

A: The EMIO board triggers the sequence through the EXTB (Exciter Transfer Board). The EXTB initiates the opening of the 41dc contactors and subsequently relays feedback signals to the SCR firing circuits on the EDEX board to commence energy dissipation.

Q: What is the purpose of the onboard 4 ms hardware filter?

A: The 4 ms hardware filter is used to condition incoming signals, providing a debouncing effect that prevents transient noise or contact chatter from causing premature or erroneous activation of the de-excitation SCR firing circuitry.

Field Installation Guidelines

• Interface Alignment: Ensure the EDEX board is correctly oriented and seated within the de-excitation module assembly. Verify that all backplane connectors are fully engaged to maintain signal integrity between the EDEX, EXTB, and EMIO.
• Shielding: To prevent electromagnetic interference during high-energy dissipation events, ensure that all firing command cables and feedback signal lines are shielded and routed separately from high-power field conductors.
• Grounding: Verify that the de-excitation module chassis is bonded to the cabinet frame. This is necessary to provide a low-impedance path for energy discharge currents and to maintain the reference potential for the firing circuitry.
• Contactor Feedback: Confirm the status signals from the 41dc contactors (MDA/MDB) are correctly wired to the board. The system relies on accurate auxiliary contact feedback to verify breaker opening before energizing the SCR firing circuits.