IS230TREAH2A - Aeroderivative Turbine Emergency Trip Terminal Board

SPECIFICATIONS:

Part Number: IS230TREAH2A
Manufacturer: General Electric
Series: Mark VIe
Number of Channels: 8
Number of Inputs: 3
Number of Outputs: 2
Maximum lead resistance: 15 Ohm
Operating system: QNX
Product Type: Aeroderivative Turbine Emergency Trip Terminal Board
Microprocessor: Intel Pentium 133 MHz
Trip Solenoid Rating: 125 V dc
Programming: Boolean
Ethernet interface: Thinwire 10-Base2
ISBus interface: Twisted pair RJ-45
Power requirements: +5 V dc
Size: 33.0 cm wide x 17.08 cm
Technology: Surface Mount
Operating temperature: 0 to 60°C
Temperature: 30 to 65°C
No.of Analog Voltage Inputs: 6
Repair: 3-7 Day
Availability: In Stock
Country of Origin: United States
Manual: GEH-6421D

FUNCTIONAL DESCRIPTION:

IS230TREAH2A 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 Control Systems. The Aeroderivative Turbine Emergency Trip (TREA) terminal board works with PPRO and YPRO turbine I/O packs as part of the Mark VIe or Mark VIeS system respectively. The inputs and outputs are as follows:

• The system includes customer input terminals available via 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).
• It utilizes nine passive pulse rate sensors (three per X, Y, and Z section) that measure turbine speed using a toothed wheel. Jumper blocks are included to distribute one set of three-speed inputs across all three PPRO or YPRO I/O packs.
• It features two TMR-voted output contacts for tripping the system, operable with 24 V DC (H1A/S1A, H3A/S3A) or 125 V DC (H2A/S2A, H4A/S4A). Additionally, there are four voltage detection circuits (24-125 V DC) for monitoring the trip string.
• For optional feature expansion, daughterboard connectors are provided, with signals in TMR systems routed to the JX1, JY1, and JZ1 DC-62 PPRO or YPRO connectors.

INSTALLATION:

For H1/S1 and H2/S2 board variants, voltage detection, and breaker relay connections are made through the I/O terminal blocks (TB1), while passive pulse rate pickups connect to TB2. Each block, secured with two screws, features 24 terminals capable of handling wires up to #12 AWG. A shield termination strip grounded to the chassis is positioned directly to the left of each terminal block.

For H3/S3 and H4/S4 board variants, voltage detection,n, and breaker relay connections are routed through the I/O box terminals at the board's top, with passive pulse rate pickups connecting to the lower terminals. These terminals plug into a header on the TREA board and accommodate a single wire up to #12 AWG.

OPERATION:

When paired with PPRO I/O packs mounted on the TREA, the speed inputs offer two configurations. Each PPRO I/O pack can independently receive three dedicated speed inputs from its respective TREA terminal points, similar to the SPRO setup. Alternatively, by using jumpers P1 and P2 on the TREA, the first three speed inputs (designated for the X pack) can be shared with the Y and Z packs. In this configuration, the terminal points for Y and Z speed inputs are disabled and must remain unused. The PPRO is set for either fanned or direct speed input, with feedback from the TREA confirming the setup. An alarm is triggered if there is a mismatch between the jumper position and the PPRO configuration.

The TREA also incorporates an EStop function through an optically isolated input circuit designed to handle DC inputs ranging from 24 V to 125 V nominal. When activated, this circuit enables coil drive power for the X, Y, and Z relay circuits via independent hardware paths. With a circuit response time of less than five milliseconds and a trip relay response time of less than one millisecond, the EStop function delivers rapid response. Although monitored by PPRO firmware, the action of cutting power to the trip relay coils is handled directly by the PPRO hardware. The PPRO can also be configured to disable the EStop function if required.

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FREQUENTLY ASKED QUESTIONS:

What is the EStop function, and how does it work?

The EStop (Emergency Stop) function is an optically isolated input circuit designed to handle DC inputs ranging from 24 V to 125 V nominal. When activated, it enables coil drive power for the X, Y, and Z relay circuits through independent hardware paths, providing a response time of less than five milliseconds for the circuit and less than one millisecond for the trip relays. This ensures a rapid and efficient emergency shutdown.

How is shielding managed on the terminal board?

To manage electrical noise and ensure proper shielding, the TREA includes a shield termination strip grounded to the chassis. This strip is positioned next to each terminal block to provide effective shielding for connected wires.

What is the purpose of the Emergency Trip Terminal Board?

The Emergency Trip Terminal Board (TREA) plays a critical role in aero-derivative turbines by facilitating emergency trip functions. It acts as a reliable interface for speed signal inputs, voltage detection, and EStop functionality, ensuring safe and efficient turbine shutdowns during emergencies.