GE IS200TREGH1ABDC Turbine Emergency Trip Terminal Board

The GE IS200TREGH1ABDC is a Turbine Emergency Trip Terminal Board (TREG) associated with the GE Speedtronic Mark VI turbine control platform. It provides electrical connections and relay control for turbine emergency trip solenoids, supporting hardwired emergency-stop inputs and external trip interlocks. The board handles the positive DC supply side of the trip-solenoid circuits and works with the corresponding negative-side circuitry.

Technical Specifications

Emergency Trip Control Function

The TREG board provides the positive DC power path for up to three turbine emergency trip solenoids. These solenoids operate as part of the turbine shutdown mechanism. When a qualifying trip condition occurs, the control system operates the associated relay circuits to initiate the trip sequence.

The board works with the corresponding TRPG terminal board, which provides the negative side of the solenoid circuits. This separation of positive and negative supply paths is important when checking terminal-board wiring, solenoid connections, and the installed protection configuration.

Trip Interlocks and Relay Logic

The terminal board provides connections for seven trip interlocks and one hardwired emergency-stop input. These inputs allow external protection conditions to participate in the turbine trip sequence. The actual interlock voltage and wiring arrangement must match the installed control-system configuration.

The onboard relay arrangement includes nine relays organized into three groups for trip-voting functions. The remaining relays support associated control functions. The voting logic and relay operation should be checked against the specific Mark VI protection configuration rather than assumed from the terminal-board model alone.

Control Power and Circuit Separation

The JX1, JY1 and JZ1 connections are associated with control-power inputs for relay operation and feedback circuits. These control-power paths are distinct from the DC supply circuit serving the trip solenoids.

When checking or replacing the board, verify the installed solenoid supply voltage, polarity, interlock wiring, and associated TRPG terminal-board configuration. A mismatch in these circuits can affect the intended emergency trip operation.

Frequently Asked Questions

Q: Does the IS200TREGH1ABDC supply both sides of the trip-solenoid circuit?

A: No. The TREG board provides the positive DC supply path, while the associated TRPG terminal board provides the negative side. Both circuit arrangements must be checked during replacement.

Q: How many turbine trip solenoids can this board support?

A: The specified capacity is up to three trip solenoids per TREG board. The actual arrangement depends on the installed turbine protection system.

Q: Is this board suitable for a 24 VDC trip-solenoid circuit?

A: The available product specification identifies a 125 VDC configuration. GE TREG documentation also describes a separate 24 VDC H2 configuration. Do not assume that the IS200TREGH1ABDC supports 24 VDC without confirming its exact hardware configuration.