GE IS200TVBAH2A / IS200TVBAH2ACC Overview
GE IS200TVBAH2A and IS200TVBAH2ACC are the same core hardware (the “C” usually indicates a conformal-coated revision). They belong to the GE Mark VI / Mark VIe Speedtronic turbine control platform and are widely used in gas and steam turbine vibration monitoring systems.
Product Type
- Module name: Vibration Input Terminal Board (TVBA)
- Manufacturer: GE (General Electric)
- Series: Mark VI / Mark VIe Speedtronic turbine control
- Main role: Interface board between vibration sensors and turbine control I/O packs.
This board is installed inside turbine control cabinets and works together with PVIB / YVIB I/O packs.
Main Function
The IS200TVBAH2A acts as the signal interface for vibration monitoring sensors. It collects field signals and sends them to the control system for processing and protection logic.
Key functions:
- Collect vibration and position signals from rotating machinery
- Provide EMI protection and signal conditioning
- Convert sensor signals into standard electrical signals for control modules
- Interface with monitoring systems like Bently Nevada racks
In short:
👉 It is a critical turbine protection and condition monitoring board.
Supported Sensors
The board directly connects to multiple industrial vibration probes:
- Proximity probes (Proximitors)
- Seismic / velocity sensors
- Velomitors
- Accelerometers
- Keyphasor reference probe
This allows the Mark VI system to monitor:
- Rotor vibration
- Shaft position
- Speed / phase reference
- Mechanical health of rotating equipment
Signal Channels & Hardware Features
Typical hardware highlights:
- Supports 14 sensor inputs via terminal blocks
- Includes EMI protection & signal suppression
- Provides buffered outputs for external monitoring systems
- Uses 37-pin connector to send signals to I/O packs
- Converts +28 V supply to −28 V using onboard daughterboards
Typical channel allocation:
- Channels 1–8 → vibration/position sensors
- Channels 9–12 → proximity sensors
- Channel 13 → Keyphasor reference probe
Role in Turbine Control System
In a Mark VI system, this board is part of the machine protection layer.
It enables:
- Early fault detection
- Predictive maintenance
- Automatic trip protection if vibration exceeds limits
Typical applications:
- Gas turbines
- Steam turbines
- Compressors
- Power plants & oil/gas facilities
Without this board, the control system cannot “see” mechanical vibration — making safe turbine operation impossible.
IS200TVBAH2A vs IS200TVBAH2ACC
Difference is mainly revision & coating:
| Model | Meaning |
|---|---|
| IS200TVBAH2A | Standard board |
| IS200TVBAH2ACC | Conformal coated version for harsh environments |
Functionally they are interchangeable in most systems.
Quick Summary
GE IS200TVBAH2A / IS200TVBAH2ACC
- Mark VI vibration terminal board
- Connects vibration sensors to control system
- Critical for turbine protection and monitoring
- Used in power, oil & gas, heavy industry













There are no reviews yet.