IS200TREAH3A - Aeroderivative Turbine Emergency Trip Terminal Board

SPECIFICATIONS:

Part Number: IS200TREAH3A
Manufacturer: General Electric
Series: Mark VIe
Product Type: Aeroderivative Turbine Emergency Trip Terminal Board
Number of channels: 24
Number of Inputs: 9
Span: -8 mV to +45 mV
Power supply voltage: 28 V DC
Voltage Range: 18 - 32 VDC
Mounting: DIN-rail mounting
Technology: Surface mount
Operating temperature: -25 to 70�C
Size: 17.8 cm Wide x 33.02 cm
Repair: 3-7 days
Availability: In Stock
Country of Origin: United States
Manual: GEH-6721

FUNCTIONAL DESCRIPTION:

IS200TREAH3A is an Aeroderivative Turbine Emergency Trip Terminal Board manufactured and designed by General Electric as part of the Mark VIe Series used in GE Distributed Gas Turbine Control Systems. The Aeroderivative Turbine Emergency Trip (TREA) terminal board interfaces with PPRO and YPRO turbine I/O packs in the Mark VIe or Mark VIeS system, respectively. The inputs and outputs are as follows:

• Customer input terminals are provided through two 24-point pluggable barrier terminal blocks (H1A or S1A, H2A or S1A) or 48 pluggable Euro-style box terminals (H3A or S3A, H4A or S4A).
• Nine passive pulse rate devices (three per X/Y/Z section) are sensing a toothed wheel to measure the turbine speed.
• Jumper blocks that enable fanning of one set of three speed inputs to all three PPRO or YPRO I/O packs.
• Two 24 V dc (H1A / S1A, H3A / S3A) or 125 V dc (H2A / S2A, H4A / S4A) TMR voted output contacts to trip the system.
• Four 24-125 V DC voltage detection circuits for monitoring the trip string.
• Daughterboard connectors for optional feature expansion. For TMR systems, signals fan out to the JX1, JY1, and JZ1 DC-62 PPRO or YPRO connectors.

INSTALLATION:

Voltage detection and the breaker relay are connected to the I/O terminal block TB1 for the H1 / S1 and H2 / S2 board variations. Wired to TB2 are passive pulse rate pick-ups. Each block is secured with two screws and contains 24 terminals that can accommodate wires up to #12 AWG. Just to the left of each terminal block is a shield termination strip connected to chassis ground. Voltage detection and the breaker relay are connected to the board's top I/O box terminals for H3 / S3 and H4 / S4 board variations. Wiring is run to the bottom terminals for passive pulse rate pick-ups. A single #12 AWG wire can be inserted into each terminal, which plugs into a header on the TREA board.

TREAH3A TERMINAL BOARD WIRING:

For H1 and S1 board variants, voltage detection, trip contact inputs, and relay outputs are wired to the I/O terminal blocks TB1. Passive pulse rate pick-ups are wired to TB2. Each block is held down with two screws and has 24 terminals accepting up to #12 AWG wires. A shield termination strip attached to chassis ground is located immediately to the left of each terminal block. For H3 and S3 board variants, voltage detection, trip contact inputs, and relay outputs are wired to the I/O box terminals at the top of the board. Passive pulse rate pick-ups are wired to the lower terminals. All terminals plug into a header on the TREA board and accept up to a single #12 AWG wire.

SPEAD REPEATER OUTPUTS:

Each speed repeater output may be configured to provide either RS-232 or RS-485 signal levels. RS-232 provides a bipolar signal that crosses through zero, as is required by many speed inputs. It is recommended that RS-232 repeater outputs be limited in wiring length to 10 meters and go to equipment that is grounded at the same potential as TREA/ WREA. RS-485 provides a balanced differential signal that is more suitable for long-distance transmissions. It is recommended that RS-485 repeater outputs be limited in wiring length to 500 meters. Wire type and termination should comply with published RS-485 standards.

The repeater outputs are grouped on the J3 connector located on WREA. The outputs are arranged to provide a signal ground and chassis ground pin pair between each active signal pair. This makes it possible to ground the individual shields of twisted shielded pair cable and reduces any chance of signal crosstalk. The diagram indicates the J3 pin assignments when looking into the connector.

WOC offers the largest inventory of replacement parts for GE Distributed Gas Turbine Control Systems, including both unused OEM components and expertly refurbished parts, all backed by a comprehensive warranty. Our team also provides specialized repair services for faulty boards, ensuring they perform like new. Available 24/7, we deliver expert support for all your automation and control system needs. For pricing, availability, or technical assistance, contact us by phone or email, and let us help keep your systems running efficiently and reliably.

FREQUENTLY ASKED QUESTIONS

What is an Emergency Trip Terminal Board (ETTB)?

The ETTB is a critical safety interface for aeroderivative gas turbines, designed to initiate rapid shutdowns during abnormal operating conditions. It monitors multiple inputs such as overspeed, high temperature, or pressure excursions and triggers protective trips to prevent equipment damage.

Which turbine parameters does the ETTB monitor?

It typically monitors overspeed, high vibration, high temperature, fuel system faults, and lubrication system failures. The board processes signals from sensors and sends immediate trip commands to the turbine control system.

How does the ETTB communicate with the control system?

The board interfaces with the Distributed Control System (DCS) or turbine control panel via hardwired discrete inputs/outputs and relay contacts, ensuring instantaneous response without relying on software polling.