Description
1. Product Title
GE IS200TBCIH1BBC – Mark VI Contact Input Termination Board (TMR)
2. Product Overview
TheIS200TBCIH1BBC is a Triple Modular Redundant (TMR) Contact Input Termination Board designed for the General Electric Mark VI Speedtronic turbine control system. Unlike simplex boards, this module is engineered to support high-availability applications by fanning out field signals to three redundant I/O processors (R, S, and T). Its primary function is to serve as the physical landing point for up to 24 discrete contact inputs, such as limit switches, pressure switches, and auxiliary contacts from breakers.
In critical power generation environments, a single point of failure can lead to an expensive unplanned trip. The IS200TBCIH1BBC solves this by providing a robust interface where field signals are voted upon by the control system’s processors. It features heavy-duty terminal blocks and advanced surge protection, ensuring that even in the presence of high-voltage transients or “noisy” field conditions, the turbine’s digital status remains accurate and reliable.
3. Technical Specifications
- Brand: General Electric (GE)
- Model: IS200TBCIH1BBC
- Warranty: One Year
- Condition: 100% New & Original
- Series: Mark VI Speedtronic
- Input Channels: 24 Dry Contact Inputs
- Redundancy: TMR (Triple Modular Redundant) support
- Excitation Voltage: Configurable for 24 VDC
- Termination: Two-tier screw-type barrier terminal blocks
- Protection: MOV (Metal Oxide Varistor) for surge suppression per channel
- Mounting: Vertical or Horizontal cabinet rack mounting
- Operating Temp: -30°C to +65°C (-22°F to +149°F)
4. Key Features & Benefits
- Triple Redundancy Support: TheIS200TBCIH1BBC allows one set of field wires to be monitored by three independent I/O packs, enabling the system to maintain operation even if one processor fails.
- Onboard Signal Filtering: Equipped with passive RC filters to eliminate contact bounce and high-frequency interference, ensuring “clean” digital transitions for the controller.
- High-Voltage Isolation: Provides significant dielectric isolation between the field wiring and the VME backplane, protecting sensitive control electronics from ground faults.
- Flexible Wetting Voltage: Can be jumper-configured to provide 125 VDC excitation, which is the industry standard for long-distance cable runs in utility-scale power plants to overcome signal attenuation.
5. Application Scenarios
- Main Steam Turbine Protection: Used for critical trip signals and valve position feedback where TMR reliability is mandated by safety standards.
- Generator Protection Interfacing: Captures discrete signals from protective relays and circuit breaker auxiliary switches for the Mark VI sequence of events (SOE) recorder.
- Emergency Oil System Monitoring: Deployed in lube oil and hydraulic fluid systems to monitor pressure and level switches that are essential for preventing mechanical bearing damage.
6. Frequently Asked Questions (FAQ)
- Q: What is the primary function of the IS200TBCIH1BBC ?
- A: It is a TMR termination board that receives 24 discrete inputs and distributes them to three redundant Mark VI I/O processors.
- Q: What is the difference between TBCI and STCI boards?
- A: The TBCI (like theIS200TBCIH1BBC is designed for TMR applications with 24 inputs, while the STCI is a Simplex board often used for 50 inputs where redundancy is not required.
- Q: Can this board be used for 125 VDC field circuits?
- A: Yes, theIS200TBCIH1BBC is fully compatible with 125 VDC wetting voltage, provided the appropriate jumpers are configured on the board.
