IS230TTURH2C - Turbine Protection Input Terminal Board

SPECIFICATIONS

Part Number: IS230TTURH2C
Manufacturer: General Electric
Series: Mark VIe
Function: Turbine Protection Input Terminal Board
Size: 33.0 cm high x 17.8 cm wide
Technology: Surface mount
Temperature Operating: -30 to 65oC
MPU pulse rate range: 2 Hz to 20 kHz
MPU pulse rate accuracy: 0.05 percent
MPU input circuit sensitivity: 27 mV pk
Availability: In Stock
Country of Manufacture: United States (USA)

Functional Description

IS230TTURH2C is a Turbine Protection Input Terminal Board manufactured by General Electric. It is a part of Mark VIe control system. The module is designed to support both simplex and TMR (Triple Modular Redundant) applications within a control system. It connects to three VTUR (Vibration Transmitter Unit Relay) boards. This configuration enhances redundancy and reliability within the system.

Features

• The TTUR incorporates three relays: K25, K25P, and K25A. To close the main breaker, identified as 52G, all three relays must close simultaneously. This action ensures the provision of 125 V dc power required for the main breaker operation.
• Connector Configuration: The TTUR module utilizes two different connectors for signal transmission. The speed signal cable to the VTUR boards is connected using the JR5 connector. On the other hand, the remaining signals are connected using the JR1 connector.
• Fan-Out for TMR Systems: In TMR systems, the signals from the TTUR module are fanned out to multiple connectors to achieve redundancy and enhance system reliability. The fan-out connections include the JR5, JS5, JT5, JR1, JS1, and JT1 connectors. This distribution ensures that the signals are available to multiple redundant paths, reducing the risk of signal loss or failure.
• In 240 V AC applications, it is crucial to avoid any unintended cross-connection between the 240 V AC and DC voltages. If such cross-connection occurs, the peak voltage can exceed the rating of the Metal Oxide Varistors (MOVs), leading to their failure.
• The reason behind this cautionary measure lies in the difference in the grounding configuration between AC and DC supplies. In most AC supplies, the neutral wire is grounded. If an inadvertent connection is created between the 125 V DC and the AC voltage, the sum of the AC peak voltage and the 125 V DC would be applied to the MOVs connected between the DC voltage and the ground without causing a failure. This is because the voltage across the MOVs remains within their rating.
• However, when the AC and DC voltages are cross-connected, the peak voltage of the AC waveform adds to the DC voltage, potentially resulting in a voltage that exceeds the MOVs' rating. This increased voltage level can cause the MOVs to fail, leading to a breakdown in their protective function.
• To prevent such failures and ensure the integrity of the system, it is crucial to exercise caution and avoid any inadvertent cross-connection between the 240 V AC and DC voltages. Proper insulation, separation, and adherence to correct wiring practices should be followed to maintain the safety and functionality of the system.

Installation Procedure

During the installation of the TTUR (Trip and Throttle Unit Relay) module, it is important to properly connect various components to the designated I/O terminal blocks and configure the relay drivers. Here are the detailed steps for installation:

• Component Connections: Connect the wires for the magnetic pick-ups, shaft pick-ups, potential transformers, and breaker relays to the two I/O terminal blocks: TB1 and TB2. The terminal blocks are securely held down with two screws each and have 24 terminals that can accept wires up to #12 AWG in size. Ensure that the connections are made according to the specified wiring diagram, which can be found in the figure labeled "TTUR Terminal Board Wiring."
• Shield Termination: Adjacent to each terminal block, you will find a shield termination strip attached to the chassis ground. This strip provides a grounding point for shielded cables. It is essential to properly terminate the shields of the connected cables at these shield termination strips. This helps minimize electromagnetic interference (EMI) and ensures accurate signal transmission.
• Relay Driver Configuration: Use jumpers JP1 and JP2 to select the desired configuration for the relay drivers K25 and K25P. These jumpers enable you to choose between SMX (Simplex) or TMR (Triple Modular Redundant) operation. Carefully set the jumpers according to the system requirements and configuration specifications.
• Optional TTL Active Speed Pick-ups: If you are using optional TTL active speed pick-ups, connect their wires to TB3. These pick-ups require an external power supply to operate correctly. Ensure that the power supply is appropriately connected and meets the specified requirements.
• Cable Connectors: In a simplex system, use cable connectors JR5 and JR1 for the required signal connections. If you are setting up a TMR system, all six cable connectors (JR5, JR1, JS5, JT5, JS1, and JT1) need to be utilized. Follow the designated wiring configuration and ensure secure connections between the TTUR module and the corresponding cables.

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FREQUENTLY ASKED QUESTIONS

What is IS230TTURH2C?
It is a Turbine Protection Input Terminal Board manufactured and designed by General Electric

What relays are present in the module, and what is their role?
It incorporates three relays- K25, K25P, and K25A. All three relays must close simultaneously to provide 125 V DC power to close the main breaker, known as 52G. This power is crucial for proper operation and control of the breaker.

Which connectors are used for specific signal connections?
It utilizes different connectors for different signal connections. The speed signal cable to the VTUR boards is connected using the JR5 connector. Other signals, excluding the speed signal, are connected using the JR1 connector.

How are signals distributed in TMR systems within the module?
In TMR systems, the signals fan out to multiple connectors to achieve redundancy and enhance system reliability. The signal distribution involves the JR5, JS5, JT5, JR1, JS1, and JT1 connectors. Each connector receives specific signals, ensuring redundant pathways for signal transmission.