GE IS200ECTBG2ADE EX2100 Exciter Contact Terminal Board

The GE IS200ECTBG2ADE is an Exciter Contact Terminal Board designed for the GE EX2100 Excitation Control System. It provides relay contact outputs and monitored contact inputs for excitation control, including generator protection and auxiliary status signals. The board operates in simplex mode and interfaces with the EMIO board for relay control and contact signal monitoring.

Functional Description

The IS200ECTBG2ADE provides an interface between the EX2100 control system and external excitation-related contact circuits. Its functions include customer lockout relay control, general-purpose relay outputs, and monitoring of generator and auxiliary contact conditions.

The board supports the following I/O functions:

• Two trip relay outputs for driving customer lockout circuits.
• Four general-purpose Form-C relay outputs controlled by the EMIO board.
• Six auxiliary contact inputs powered and monitored using 70 V DC wetting voltage.
• One 52G generator contact input for monitoring generator breaker status.
• One 86G contact input for monitoring lockout relay status.

Relay Outputs and Control

The two trip relays are driven by the EMIO interface in the M1 controller. Their relay drivers use 24 V DC control power. Each customer lockout circuit is driven through one relay with two parallel normally closed contacts.

The four general-purpose outputs use Form-C contacts, providing common, normally open, and normally closed connections. Customer-supplied power, typically 125 V DC, is switched through these contacts according to the EX2100 control logic.

The specified relay break characteristic is 28 V DC. Relay contact selection and external circuit protection must account for the applicable DC load and switching conditions.

Contact Input Monitoring

The board provides six auxiliary contact inputs, together with dedicated 52G and 86G contact monitoring circuits. These inputs use nominal 70 V DC wetting voltage to detect changes in external contact states.

The wetting voltage can vary from 63 to 84 V DC. Input circuits include resistor isolation and current-limiting arrangements. The detected contact states are indicated by red LEDs and communicated to the control interface.

For simplex operation, the contact signals are connected to the M1 controller. The redundant ECTBG1 configuration uses a different control arrangement and should not be substituted for the ECTBG2 board without checking the system architecture.

Technical Specifications

Frequently Asked Questions

Q: Can the IS200ECTBG2ADE operate in a redundant EX2100 control system?

A: No. The ECTBG2 configuration is intended for simplex operation, with its control and contact signals connected to the M1 controller. The ECTBG1 version is designed for redundant control applications.

Q: What is the difference between relay control voltage and customer power?

A: The 24 V DC supply operates the relay drivers, while the nominal 125 V DC customer supply is switched through the relay contacts to external circuits. These are separate electrical functions and should not be treated as interchangeable power inputs.

Q: What voltage is used for auxiliary contact monitoring?

A: The board uses nominal 70 V DC wetting voltage, with an operating range of 63-84 V DC. This voltage allows the board to detect external contact states through its monitored input circuits.