General Electric IS200ECTBG1ABB Mark VI Exciter Contact Terminal Board

The General Electric IS200ECTBG1ABB, also cataloged as the IS200ECTBG1A Excitation Contact Terminal Board, operates as a dedicated hardware component for contact input monitoring and trip output execution within General Electric Mark VI Turbine Control System platforms. The board routes 70 VDC wetted auxiliary contact signals and controls Form-C relay outputs in redundant system modes to manage generator excitation and drive assemblies.

Hardware Specifications

Backplane Bus Communication Velocity & Firmware Flash Compatibility

The IS200ECTBG1ABB executes low-latency contact signal routing while operating under management of the master EMIO board. Operating strictly in redundant system mode, the board draws dual power feeds from M1 and M2 power supplies residing on the EPSM module to ensure deterministic execution of trip functions. Signal lines maintain noise immunity and firmware flash parity across associated EPCT, EXTB, and EACF I/O terminal boards to protect generator control logic against bus communication latencies.

Frequently Asked Questions

Q: Which contact inputs on the IS200ECTBG1ABB are wetted directly by board power?

A: Six auxiliary contact inputs, including the 52G generator online status input and the 86G lockout input, are powered directly with 70 VDC provided by the board.

Q: Can the IS200ECTBG1ABB board be deployed in a simplex system configuration?

A: No. As part of the ECTBG1 model group, the IS200ECTBG1ABB hardware variant is designed exclusively for operation in redundant system mode.

Q: How are the four general-purpose Form-C contact outputs controlled on this module?

A: The four Form-C relay outputs (utilized for signals such as 94EX and 30EX) are driven and managed by the associated EMIO control board, which also monitors relay auxiliary contact status.

Field Installation Guidelines

Ensure power from the EPSM module (M1 and M2 supplies) and connected generator control circuits is completely isolated before mounting. Secure the terminal board firmly to the cabinet sub-panel to maintain frame ground connection. Wire 70 VDC wetted contact inputs (52G and 86G) and Form-C relay output lines to the designated screw terminal blocks according to the pinout layout in GEH-6632. Ensure signal cable shields are grounded at a single point to prevent high-frequency electrical noise from degrading contact sensing telemetry.