IS230TREAH5A - Turbine Emergency Trip Terminal Board

SPECIFICATIONS:

Part Number: IS230TREAH5A
Manufacturer: General Electric
Series: Mark VIe
Number of Channels: 8
Maximum lead resistance: 15 Ohms
Operating system: QNX
Product Type: Turbine Emergency Trip Terminal Board
Microprocessor: Intel Pentium 133 MHz
Trip Solenoid Rating: 125 V dc
Programming: Boolean
Ethernet interface: Thinwire 10Base2
ISBus interface: Twisted pair RJ-45
Power requirements: +5 V dc
Dimensions: 17.8 cm wide x 33.02 cm
Operating temperature: 0 to 60°C
No.of Analog Voltage Inputs: 6
Repair: 3-7 Days
Availability: In Stock
Country of Origin: United States
Manual: GEH-6421D

FUNCTIONAL DESCRIPTION:

IS230TREAH5A is a Turbine Emergency Trip Terminal Board manufactured and designed by General Electric as part of the VIe Series used in GE Distributed Control Systems. The turbine emergency trip terminal board, TREAH1A, works with PPRO 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, H2A) or 48 pluggable Euro-style box terminals (H3A, H4A).
• Nine passive pulse rate devices (three per X/Y/Z section) sense a toothed wheel to measure the turbine speed.
• Jumper blocks that enable fanning of one set of three-speed inputs to all three PPRO I/O packs.
• Two 24 V dc (H1A, H3A) or 125 V dc (H2A, H4A) 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.

INSTALLATION:

For H1 and H2 board variants, voltage detection and the breaker relay 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 H4 board variants, voltage detection and the breaker relay 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.

E-STOP/TRP INPUT:

• The TRP input is configurable in PPRO to either be required or bypass the signal. When enabled, the TRP input works through a hardware path on PPRO and does not act through PPRO firmware. When enabled, TRP must be powered for the trip relays to close.
• The ESTOP must be connected to a clean DC source battery or a filtered (<5% ripple) rectified AC source.
• There must be a minimum of 18 V dc at the TRP inputs for proper operation.
• The current required was kept low to minimize the drop on long cable runs.

As the TRP is very fast < 5 ms and the output relay contacts are also fast (< 15 ms), best wiring practices should be utilized to avoid disoperation. Use twisted-pair cable when possible and avoid running with ac wiring.

OPERATION:

When used with PPRO I/O packs mounted directly on the TREA, the speed inputs provide two options. Each PPRO I/O pack may receive a dedicated set of three-speed inputs from its respective TREA terminal points, as is done on SPRO. As an option, jumpers P1 and P2 may be placed on the TREA to take the first three speed inputs (those for the X pack) and fan them to the Y and Z packs. When this is selected, the terminal board points for Y and Z. Speed inputs become no-connect and should not be used. As a check, the PPRO is configured for fanned or direct speed input and a feedback signal provided by TREA. An alarm will be generated if there is a mismatch between the jumper position and the PPRO configuration.

The TREA includes an EStop function. This consists of an optically isolated input circuit designed for a DC input in the range of 24 V to 125 V nominal. When energized, the circuit enables coil drive power in the X, Y, and Z relay circuits through independent hardware paths. The response time of this circuit of less than five milliseconds, plus the response time of the trip relays of less than one millisecond, yields a very fast EStop response. EStop is monitored by PPRO firmware, but the action to remove the trip relay coil power is a hardware path in PPRO. It is possible to configure PPRO to turn off the Estop function.

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FREQUENTLY ASKED QUESTIONS:

How can I troubleshoot a non-responsive board?

Start by verifying the power supply, then check input signal continuity and fuse status. Inspect the PCB for burnt components, cracked solder joints, or corrosion on connectors. Use diagnostic LEDs if available to identify fault locations.

What should I do if the board trips without any input signals?

Check for power supply fluctuations, loose connections, or short circuits on the input lines. Inspect relays and PCB for signs of damage or leakage. False trips are often caused by grounding issues or signal interference.

How do I verify the DC power supply to the trip board?

Measure the DC voltage at the board input terminals using a multimeter. Ensure the voltage is within the specified range, typically 24 VDC ± 10%. Check for loose connections, blown fuses, or voltage drops under load.