IS200TREAS4A - Aero Derivative Turbine Emergency Trip Board

IS200TREAS4A - Aero Derivative Turbine Emergency Trip Board IS200TREAS4A - Aero Derivative Turbine Emergency Trip Board

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Part Number: IS200TREAS4A
Manufacturer: General Electric
Series: Mark VIe
Product Type: Aero Derivative Turbine Emergency Trip Board
Function: Emergency Trip Terminal Board
Number of inputs: 6
Number of outputs: 3
Technology: Surface Mount
Size: 33.0 cm high x 17.8 cm
Temperature: -30 to +65°C
Repair: 3-7 Days
Weight: 2.00 lbs
Country of Origin: USA
Availability: In Stock
Manual: GEH-6721L


IS200TREAS4A is an Aero Derivative Turbine Emergency Trip Board manufactured and designed by General Electric as part of the Mark VIe Series used in distributed control systems. The Aero derivative Turbine Emergency Trip (TREA) terminal board combined with the WREA option card works with PPRA turbine I/O packs as part of the Mark* VIe system. The inputs and outputs are as follows:

  • Customer input terminals are provided through two 24-point pluggable barrier terminal blocks (H1A or S1A) or 48 pluggable Euro-style box terminals (H3A or S3A).
  • Six fanned passive pulse rate devices (up to three shafts with two sensors each) sensing a toothed wheel to measure the turbine speed.
  • Three 24 V dc TREAH1A, H3A plus WREAH1A or TREAS1A, S3A plus WREAS1A TMR voted solid-state output contacts to trip the system.
  • Four 24-125 V dc voltage detection circuits for monitoring trip string.
  • Four 24 V dc WREAH1A or WREAS1A contact inputs provide additional hardware or conditional trip inputs. Wetting power is supplied through the JH1 connector on WREA.
  • One speed repeater output for each of the six-speed inputs reproduces the speed pulse rate signals using an RS–232 or RS–422 transmitter.


  • When received from the factory the WREA should by default be mounted to the TREA terminal board. Should the board have to be removed to service the TREA fanning jumpers use the following procedure to replace the WREA.
  • Align the two connectors on the WREA with those on the TREA. When viewing the WREA the bottom of the board is considered to be the end with the row of configuration jumpers. The connectors are keyed such that they will only mate when aligned properly.
  • Once the two boards are aligned seat the connection by firmly pressing on the four screw heads that surround the connector.
  • 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 the 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.


The trip relays on TREA may be freely located anywhere in a trip string. Because the trip string circuit is not fixed, there are three general-purpose isolated voltage sensor inputs on TREA. These can be used to monitor any points in the trip system and drive the voltage status into the system controller where action can be taken. Typical use of these inputs may be to sense the power supply voltage for the two trip strings (PWR) and to sense the solenoid voltage of the device being driven by the relays (SOL1, SOL2). This set of applications is used in the wording of the board symbol, but the sensors may be freely applied to best serve the application.


The fanning of the X channel speed inputs to the Y and Z PPRA I/O packs is selected by jumpers JP1 and JP2. These jumpers are required for TREA and WREA operations with PPRA. The six-speed repeater output circuits' output behavior is configured using the WREA jumpers JP1 through JP12. RS-232 signal level (the default) and RS-485 signal level can be chosen for the repeater output using the jumpers JP1 through JP6. While JP4–JP6 configure repeaters for PR4–PR6, JP1–JP3 configure the repeater outputs for PR1–PR3. When used with PPRA, jumpers JP7 through JP12 should stay in the PR1 through PR6 positions by default.

WOC has the largest stock of GE Distributed Gas Turbine Control System Replacement Parts. We can also repair your faulty boards. WORLD OF CONTROLS can also supply unused and rebuilt backed-up with a warranty. Our team of experts is available round the clock to support your OEM needs. Our team of experts at WOC is happy to assist you with any of your automation requirements. For pricing and availability on any parts and repairs, kindly get in touch with our team by phone or email.


How often should the Emergency Trip Board be tested?

Regular testing and maintenance of the Emergency Trip Board are essential to ensure its proper functioning during emergencies. It is recommended to adhere to the manufacturer's guidelines and conduct routine inspections, tests, and calibration checks as per the maintenance schedule.

What are the consequences of a malfunctioning Emergency Trip Board?

A malfunctioning Emergency Trip Board can lead to serious consequences such as turbine damage, operational downtime, safety hazards, and potential environmental risks. Therefore, it is imperative to promptly address any issues and ensure the reliability of the trip board.

Who should be responsible for the maintenance of the Emergency Trip Board?

Maintenance and servicing of the Emergency Trip Board should be carried out by qualified technicians or engineers with expertise in turbine control systems. Additionally, adherence to regulatory standards and safety guidelines is essential to maintain the integrity of the emergency shutdown system.