Basic Information

• Model: IS200TVBAH2ACC

• MRP Part Number: MRP646218

• Brand & Series: GE Speedtronic Mark VI/Mark VIe Turbine Control System, TVBA Vibration Input Terminal Board Series

• Product Type: Shaft Vibration/Displacement Input Terminal Board, Vibration Signal Interface Board, Eddy Current/Velocity Sensor Signal Conditioning Terminal Board

• Compatible Systems: Mark VI/Mark VIe Gas/Steam Turbine TMR (Triple Modular Redundant) Control System, works with PVIB/YVIB I/O Pack

• Country of Origin: USA

• Function: Core vibration monitoring I/O interface for Mark VI control system, directly connects eddy current displacement probes, magnetoelectric velocity sensors, accelerometers and keyphasor probes, performs signal conditioning, isolation, bias power supply and diagnostics, realizes high-precision acquisition and protection of shaft vibration, shaft displacement, keyphasor and bearing vibration, complies with API 670 rotating machinery protection standard

Product Overview

Core Functions

1. 14‑Channel Multi‑Sensor Connection: 14 independent inputs, channels 1–8 compatible with eddy current probes, velocity sensors, accelerometers (channels 1–3); channels 9–12 only support eddy current probes; channel 13 supports keyphasor/reference eddy current probes.

2. Constant Current Bias Power Supply: Provides -24VDC (-23~-26V), max 12mA constant current bias per channel, directly drives high‑impedance eddy current/displacement probes without external power modules.

3. TMR Redundancy Compatibility: Adapts to Mark VI triple redundant architecture, three‑channel synchronous sampling and hardware voting; single‑channel failure does not affect system operation, meeting high‑reliability protection requirements.

4. Signal Conditioning & Isolation: Built‑in anti‑aliasing filtering, EMI suppression, ≥500Vrms electrical isolation between channels and to ground, isolates control side from field strong interference, ensures signal accuracy and protects system safety.

5. Multi‑Channel Buffered Outputs: Each channel has BNC buffered output, DB9/DB25 interfaces, can synchronously output to third‑party monitoring systems (such as Bently 3500) for parallel monitoring and diagnosis.

6. Sensor Diagnosis & Status Indication: Supports probe open/short circuit, bias abnormality diagnosis, on‑board status indicators, quickly locates sensor/wiring faults.

7. Industrial‑Grade Stable Design: UL94 V‑0 flame‑retardant PCB, wide temperature operation, anti‑vibration/anti‑EMI, removable terminal blocks, adapting to harsh industrial environments in power plants.

Technical Specifications

• Power Supply: +28VDC (provided by PVIB/YVIB backplane, on‑board WNPS negative power supply converts to -28V/-24V), typical power consumption 10W

• Input Channels: 14 independent differential channels (1–8, 9–12, 13 keyphasor)

• Sensor Compatibility: Eddy current displacement probes (Proximitors), variable reluctance velocity sensors (Velomitors), seismic velocity sensors (Seismics), accelerometers (channels 1–3), keyphasor probes

• Bias Output: -24VDC±1%, max 12mA constant current per channel

• Signal Range: Displacement: -2VDC to -22VDC; Velocity: ±10VAC; Acceleration: 4–20mA

• Electrical Isolation: ≥500Vrms between channels and to ground

• Temperature: Operating 0°C to +65°C; Storage -40°C to +85°C

• Structure: Industrial PCB, dual 24‑pin removable barrier terminal blocks, BNC buffered outputs, standard Mark VI cabinet slot mounting

• Protection: IP20 (cabinet‑mounted), UL94 V‑0 flame‑retardant, anti‑vibration and anti‑electromagnetic interference (EMI)

• Connectors: 37‑pin backplane connector, DB9/DB25, BNC, pluggable terminal blocks (for #12 AWG cables)

• Certifications: API 670, CE, UL 61010-1, IEC 61508 SIL 2

• Matching Units: PVIB/YVIB I/O Pack, WNPS Negative Power Supply Daughterboard

Typical Applications

• Shaft vibration, shaft displacement, bearing vibration, keyphasor signal acquisition and protection for Mark VI/Mark VIe gas turbines and steam turbines

• Rotating machinery condition monitoring for combined‑cycle power plants, petrochemical compressor/pump units, offshore platform generator sets

• Parallel monitoring with third‑party systems such as Bently Nevada 3500 to achieve dual vibration protection

• Vibration I/O terminal board replacement for old Mark V/VI system upgrades

• Overspeed, vibration over‑limit, shaft displacement over‑limit safety protection logic complying with API 670 standard