The IS200TVBAH2A (including the H2ACC revision) is a specialized Vibration Terminal Board designed for the GE Mark VI control system. This “Modulator Plate” style board serves as the essential interface between field-mounted vibration sensors and the control system’s processing packs. It is engineered to handle high-frequency signals from proximity probes, seismic transducers, and accelerometers, providing the necessary signal conditioning and termination for critical asset condition monitoring on large-scale rotating equipment.
Product Parameters
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Model: IS200TVBAH2A / IS200TVBAH2ACC
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Series: Mark VI Speedtronic
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Board Type: TVBA (Vibration Terminal Board)
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Input Channels: Supports up to 8 vibration sensor inputs
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Sensor Compatibility: Proximitors, Seismics, and Accelerometers
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Power Supply: 24V DC / -24V DC (Proximitor power provided by the board)
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Excitation: Integrated power for field-mounted vibration probes
Product Specifications
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Termination: Heavy-duty, high-density screw terminal blocks
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Connectors: Two 37-pin D-type connectors for connection to I/O packs (VCCC/VCRC)
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Circuitry: Passive filtering and surge protection for low-noise signal integrity
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Revision: H2ACC (Enhanced hardware revision with improved component shielding)
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Mounting: Standard Mark VI cabinet “Modulator Plate” footprint
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Isolation: Galvanic isolation between field signals and the control backplane
Application Fields
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Gas Turbine Monitoring: Real-time tracking of shaft vibration and bearing health.
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Steam Turbine Control: Detecting rotor imbalance and eccentricity during startup.
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Large Generators: Monitoring mechanical stability and stator vibrations.
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Centrifugal Compressors: Integration into asset protection schemes for high-speed machinery.
Q&A
Q: What is the primary function of the TVBA board compared to standard analog boards? A: Unlike standard analog boards, the TVBA is specifically designed to handle the high-frequency AC signals and negative voltage excitation (-24V) required by industrial vibration probes.
Q: Can this board be used in a TMR (Triple Modular Redundant) configuration? A: Yes, it is designed to distribute vibration signals to three redundant I/O packs (R, S, and T) for voted protection logic.
Q: Does the “ACC” suffix indicate a special coating? A: In GE nomenclature, “CC” often refers to Conformal Coating, which provides additional protection against moisture and corrosive industrial gases.
Q: What happens if a vibration probe cable is short-circuited? A: The board includes current-limiting resistors and individual channel protection to ensure a fault on one probe does not compromise the power supply to the remaining sensors.
