GE IS200TVBAH2ACC Analog Input Termination Board (TVBA) for Mark VI Speedtronic Systems

Technical Specifications

• Manufacturer: General Electric (GE)
• Product Series: Mark VI Speedtronic
• Board Type: Analog Input Termination Board (TVBA)
• Input Channels: 16 independent, individually configurable analog input channels
• Supported Signal Types: 4 – 20 mA, 0 – 20 mA DC current; 0 – 5 V, 0 – 10 V DC voltage
• A/D Conversion: 16 – bit resolution, ±0.05% full – scale (FS) accuracy
• Sampling Rate: 10 Hz – 1000 Hz (configurable in grades); maximum 10 kHz for high – speed channels
• Input Impedance: ≤100 Ω for current signals; ≥1 MΩ for voltage signals
• Terminal Blocks: 2 vertical barrier – type terminal blocks, 32 screw terminals (1 – 32 numbering) for field wiring
• Connectors: 2 VME backplane connectors (J1/J2) for communication with Mark VI processor boards
• Power Requirements: 24 VDC (logic); 5 VDC (A/D converter), total power consumption 12 W (typical)
• Operating Temperature: -40°C to +70°C
• Dimensions: 188 mm × 262 mm × 21 mm (18.8×26.2×2.1 cm)
• Weight: 0.5 kg
• Certifications: UL/cUL Class I, Div 2 compliant for hazardous locations
• Circuit Protection: Metal Oxide Varistors (MOVs) per channel for surge protection; 2 ms hardware filter for noise reduction
• PCB Construction: Multilayer PCB with surface – mount devices (SMDs) for enhanced reliability

Functional Features

• 16 – Channel Independent Processing: 16 individually configurable channels can handle mixed signal types (current/voltage), meeting diverse analog input needs of turbine control systems.
• High – Precision Signal Conversion: 16 – bit A/D conversion with ±0.05% FS accuracy ensures accurate measurement of critical parameters like temperature, pressure, and flow.
• Flexible Sampling Control: The configurable sampling rate (10 Hz – 1000 Hz) allows matching the dynamics of different field devices, balancing data granularity and system load.
• Signal Conditioning & Protection: Hardware filtering eliminates electromagnetic interference (EMI) and radio – frequency interference (RFI); MOVs protect against voltage surges, ensuring stable signal processing.
• Redundancy Compatibility: Works with simplex, dual – redundancy, and TMR Mark VI systems, and cooperates with VTCC/VCRC processor boards to achieve fault – tolerant operation.
• Plug – and – Play Installation: Vertical barrier – type terminal blocks and VME backplane connectors enable quick field replacement and integration without full system shutdown.
• Diagnostic Monitoring: Monitors channel – level open/short circuits, over/under – range conditions, and A/D converter health, triggering system alarms for proactive maintenance.
• Isolation: Channel – to – channel and channel – to – ground isolation prevents cross – talk and ground loops, enhancing measurement accuracy.

Application Scenarios

• Turbine Control Systems: Primarily used in Mark VI Speedtronic gas and steam turbine control systems for acquiring parameters such as bearing temperature, oil pressure, fuel flow, and exhaust gas temperature, supporting turbine speed, load, and combustion control.
• Power Generation: Deployed in thermal power plants, combined – cycle facilities, and cogeneration plants to provide analog input data for turbine condition monitoring and protection logic, preventing catastrophic failures.
• Simplex & Redundant Installations: Suitable for non – redundant (simplex) industrial processes and high – reliability (dual/TMR) applications such as nuclear power auxiliary systems and offshore platform turbine control.
• Industrial Automation: Applied in distributed control systems (DCS) for analog data acquisition in petrochemical, oil and gas, and manufacturing industries, controlling pumps, valves, and heat exchangers.
• Hazardous Environments: UL/cUL Class I, Div 2 certification allows operation in explosive – risk areas including refineries, chemical plants, and offshore drilling rigs.

Compatibility

• GE Platforms: Mark VI, Mark VIe, Mark VIeS Speedtronic turbine control systems
• Processor Boards: VTCC (VME Turbine Control Card), VCRC (VME Control Redundant Card) in VME racks
• Redundancy Configurations: Simplex, dual – redundancy, and TMR systems with redundant I/O processor connections
• Field Devices: 4 – 20 mA transmitters, pressure/temperature sensors, flow meters, and other analog field instruments
• Software: Compatible with GE ToolboxST for configuration, calibration, and diagnostic monitoring

Installation Notes

1. Terminal Wiring: Connect field devices to 2 vertical terminal blocks (32 terminals total), and wires up to #12 AWG can be secured with screw terminals.
2. Signal Configuration: Use ToolboxST to set each channel’s signal type (current/voltage), range, and sampling rate before system startup.
3. Power Connection: Connect 24 VDC (logic) and 5 VDC (A/D) power to dedicated backplane pins; do not reverse polarity to avoid damage.
4. Surge Protection: Confirm that MOVs are correctly connected to each channel to suppress voltage transients; avoid mixing AC and DC circuits on the same terminal block.
5. Grounding: Connect terminal block shields to chassis ground to reduce EMI and prevent ground loops.
6. Redundancy Setup: In TMR systems, connect the board to three redundant VME backplane slots to ensure data integrity through voting logic.

Key Advantages

• High – Precision Acquisition: 16 – bit A/D conversion and ±0.05% FS accuracy ensure precise measurement of critical turbine parameters.
• Flexible Channel Configuration: 16 independent channels support mixed signal types, adapting to complex turbine control requirements.
• Robust Environmental Performance: The operating temperature range of -40°C to +70°C and hazardous location certification guarantee stable operation in harsh industrial settings.
• Redundancy Support: Compatibility with simplex/dual/TMR systems meets various reliability needs from general industrial control to mission – critical applications.
• Simplified Maintenance: Plug – in terminal blocks and modular design enable quick replacement, minimizing downtime during maintenance.
• Comprehensive Diagnostics: Channel – level fault monitoring facilitates proactive maintenance and reduces unplanned shutdowns.