Description
The IS200TVBAH2ACC is a specialized Vibration Input Terminal Board (TVBA) engineered specifically for General Electric Speedtronic Mark VI and Mark VIe gas and steam turbine control systems. Designed to interface directly with industrial vibration and proximity sensors, this terminal board conditions and routes critical machinery health signals to the system’s vibration I/O packs (such as the PVIB or YVIB packs).
Product Specifications (Datasheet)
- Brand: GE (General Electric / GE Fanuc)
- Model / Part Number: IS200TVBAH2ACC (Compatible with base series IS200TVBAH2A architectures)
- Series: Mark VI / Mark VIe Speedtronic Turbine Control System
- Product Name: Vibration Input Terminal Board (TVBA)
- Place of Origin: United States
- Lifecycle Status: Specialized Industrial Supply / Active Legacy Replacement
- Sensor Compatibility: Interfaces directly with seismic (velocity) probes, Proximitors, Velomitors, Keyphasor reference probes, and accelerometers.
- Input Channels: Supports up to 14 total sensor inputs across dual removable terminal blocks (including 8 vibration/position channels and specialized reference/Keyphasor inputs).
- Buffered Outputs: Equipped with dedicated 9-pin and 25-pin D-sub connectors as well as individual Bayonet Nut Connector (BNC) coaxial ports per channel for integration with third-party monitoring equipment (such as Bently Nevada 3500 racks).
Operating Guidelines and Usage Methods
Proper integration and handling of vibration monitoring terminal boards require strict adherence to instrumentation wiring and electrical safety protocols.
- ESD Precautions: Always utilize a certified grounded electrostatic discharge (ESD) wrist strap when handling associated electronic I/O packs to protect sensitive internal logic circuits from static damage.
- Shield Grounding: Terminate all coaxial and shielded sensor cables securely to the designated chassis grounding bars immediately adjacent to the terminal blocks to prevent electromagnetic interference (EMI) and electrical noise from corrupting vibration measurements.
- Environmental Control: Operate the host turbine control cabinet within a clean, climate-controlled environment protected from excessive humidity, conductive dust accumulation, and severe temperature fluctuations [-30°C to +65°C operating range].
Power-On and Power-Off Sequence
Adhering to correct energization protocols prevents signal transients and protects sensitive analog input circuitry within the Mark VI/VIe architecture.
- Power-On Sequence:
- Confirm that all field sensor wiring, shield grounds, and backplane interface cables are correctly and securely terminated to the IS200TVBAH2ACC board.
- Plug the compatible Mark VIe vibration input I/O pack firmly into the board’s 37-pin interface connector and secure all locking mechanisms.
- Switch on the primary cabinet power distribution feeds and check operator workstation software to confirm normal module communication and channel status.
- Power-Off Sequence:
- Safely take the affected vibration monitoring loops offline via the operator workstation software if required.
- Power down the system rack distribution feeds if complete electrical isolation is required prior to maintenance.
- Allow circuits to fully de-energize before unseating the plug-in I/O pack from the terminal board.
Product Instructions
The TVBA board acts as the permanent mechanical and electrical termination point for field vibration probes, featuring onboard electromagnetic interference (EMI) protection and pull-up biasing for open-circuit detection. It supports both simplex and Triple Modular Redundant (TMR) applications. Periodically inspect terminal screw torques, shield grounding bars, and BNC connection integrity during scheduled maintenance outages to prevent false vibration trips or signal attenuation.
Frequently Asked Questions (Q&A)
- Q: What system utilizes the IS200TVBAH2ACC board?
- A: It is deployed within the GE Mark VI and Mark VIe Speedtronic turbine control architecture for machinery vibration and proximity monitoring.
- Q: Can I connect third-party vibration monitors like a Bently Nevada rack to this board?
- A: Yes, the board includes dedicated BNC connectors and 9/25-pin D-sub outputs that provide unity-gain buffered signals for external monitoring equipment without disrupting the main control system.
- Q: What should I check first if a vibration channel reports an open-circuit fault?
- A: Verify field wiring and terminal block tightness, inspect the sensor probe cable continuity, and ensure the paired I/O pack is securely seated on the 37-pin connector.
