GE IS200EXHSG4REC Exciter High-Speed Relay Driver Board

The GE IS200EXHSG4REC is identified as an Exciter High-Speed Relay Driver Board (EXHS) associated with the EX2100 Excitation Control system. This board handles relay-driving and contact-status signal functions within the excitation control architecture. The supplied technical information also references the IS200EXHSG4AEC variant, so the exact revision and assembly identification require confirmation before applying variant-specific specifications.

Functional Role in the EX2100 System

The EXHS board provides relay contact outputs, contact inputs, and signal-conditioning circuits. It connects to the Exciter Main I/O (EMIO) board through the Exciter Backplane (EBKP), allowing controller commands and exciter status signals to interface with field switching equipment.

Its main functions include:

• Driving the field breaker close relay (41) and trip relay (41T).
• Controlling the field-flashing pilot relays (53A and 53B).
• Providing pilot relay control for the de-excitation relay (KDEP).
• Conditioning de-excitation and crowbar status signals for transmission to EMIO.
• Monitoring auxiliary contact feedback from the field switching devices.

These functions are documented for the EXHS board family in the GE EX2100 control documentation.

G4 Configuration and Control Mode

The G4 designation identifies the simplex breaker-mode configuration within the EXHS board group structure. Unlike the G2 contactor-mode configuration, G4 uses both the 41 close relay and the 41T trip relay.

This distinction matters when selecting a replacement board. The excitation system must use the appropriate breaker-control arrangement, and the board configuration must match the installed field circuit.

Connectors and Board Components

The supplied product information identifies the following physical characteristics:

• Eight plug connectors, with connector positions ranging from 2 to 12.
• Two terminal connectors, designated E1 and E2.
• Three vertical male ribbon connectors for board interconnections.
• Seven relays identified by designators associated with M1, M2, and C control channels.
• Integrated circuits, transistors, resistors, capacitors, and a heat sink.

The connector arrangement provides the electrical interfaces for relay control, contact feedback, and signal connections. Actual pin assignments should be checked against the applicable EXHS wiring documentation before installation.

Technical Specifications

Frequently Asked Questions

Q: What is the difference between the EXHS G4 and G2 configurations?

A: Both are simplex configurations, but G4 is designed for breaker-mode control and uses the 41T trip relay in addition to the 41 close relay. G2 is intended for contactor-mode control and does not use the 41T trip relay.

Q: What signals does the EXHS board exchange with the excitation control system?

A: It handles relay commands and auxiliary contact feedback associated with the field switching and flashing circuits. It also conditions de-excitation and crowbar status signals for the EMIO board.

Q: Does the IS200EXHSG4REC directly measure generator field current?

A: No. The EXHS board handles relay driving, contact monitoring, and status signal conditioning. Generator field current and voltage feedback are handled by the separate EDCF board in the EX2100 system.