- Model: IS220TVBAH2A
- Manufacturer: GE (General Electric)
- Core Function: Passive terminal board for terminating and conditioning vibration sensor signals (proximitors, accelerometers, velocity sensors) from turbine machinery, providing shielded wiring interfaces, surge protection, and buffered outputs to compatible vibration I/O packs for precise dynamic monitoring and protection.
- System Compatibility: Compatible with Mark VIe and Mark VIeS control systems, specifically designed to interface with vibration monitoring packs such as IS220PVIBH1A or equivalent for turbine condition monitoring.
- Supply Status: In Stock / Available as refurbished or surplus from global inventory.
- Warranty Standard: 12-month functional warranty, fully tested.
Key Technical Specifications
- Product Model: IS220TVBAH2A
- Manufacturer: GE
- System Platform: Mark VIe Turbine Control System
- Mounting Type: Panel or rack mounting with screw terminal blocks for field wiring
- Compatible I/O Packs: Supports simplex or redundant attachment of IS220PVIBH1A or similar vibration input packs
- Vibration Sensor Inputs: Termination for up to 14 channels (typically 8-14 buffered proximitor or dynamic sensor inputs), including proximitors, accelerometers, and velocity transducers
- Buffered Outputs: Up to 14 buffered channels for signal distribution to external monitoring devices or additional packs
- Shield Termination: Dedicated shield bars and terminals for electromagnetic noise suppression on long cable runs
- Power Supply: Passive board; derives power and excitation from attached I/O pack (typically 24-28 V DC system supply)
- Operating Temperature Range: -30°C to +65°C, suitable for turbine hall and enclosed control environments
- Humidity Tolerance: 5% to 95% non-condensing, with board-level protection against condensation
- Dimensions: Standard Mark VIe terminal board size (approximately 20-25 cm height × 15-20 cm width, configuration-dependent)
- Weight: Approximately 0.8-1.2 kg
- Certification Standards: CE compliant, UL listed elements, meets IEC 61131-2 for industrial control environmental and EMC performance; supports hazardous area use via system certifications
- MTBF (Mean Time Between Failures): High passive reliability (>500,000 hours estimated), dependent on connected components
- Isolation Voltage: Up to 1500 V AC isolation between channels and ground via terminal design and suppression circuitry
Technical Architecture & Functional Positioning
The IS220TVBAH2A operates as a passive field interface terminal board in the Mark VIe vibration monitoring subsystem, positioned at the sensor termination layer to connect raw dynamic signals from turbine-mounted vibration probes to the active PVIB series I/O packs. It features dual terminal blocks with 24+ screw terminals for sensor wiring, integrated surge suppression, and buffered amplifiers to maintain signal integrity over extended distances typical in large-frame turbines. The board mounts the vibration I/O pack via secure connectors, routing conditioned signals for digitization, analysis, and alarming in the controller.
This architecture addresses critical challenges in rotating machinery protection, such as mitigating electromagnetic interference on low-level millivolt signals from proximitors and accelerometers, while providing redundant paths and shield grounding to prevent ground loops. Buffered outputs allow parallel connection to external diagnostic tools or backup monitors without degrading primary signals. In TMR configurations, the board supports multiple pack attachments for voting-based vibration protection, enhancing fault tolerance for high-availability applications. Its passive nature simplifies field maintenance and troubleshooting, relying on the attached pack for excitation, scaling, and diagnostics.
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