Description
Hardware & Electrical Specifications
‑ Manufacturer: Bently Nevada (Baker Hughes) ‑ Compatible System: 3500‑05 full‑size / mini TSI machinery‑protection rack ‑ Functional Type: Legacy Old‑Version 2‑Channel Enhanced Keyphasor Module ‑ Channel quantity: 2 independent Keyphasor input channels ‑ Input sensor type: Proximity probe / magnetic pickup ‑ Input frequency range: DC ~ 20 kHz ‑ Speed measurement resolution: 0.1 RPM ‑ Typical power consumption: 3.2 W, powered by rack backplane bus ‑ Front‑panel interface: Two BNC signal input connectors; status LED indicators: OK, TX/RX ‑ Hot‑swap: Supports hot‑swap. After hot‑swap, vibration protection alarm & trip logic keeps running; phase and speed data are temporarily lost. ‑ PCB Coating: Conformal coated for G3 harsh industrial cabinet environment
Environmental Specifications
‑ Operating Temperature: 0 °C ~ +60 °C ‑ Storage Temperature: ‑40 °C ~ +85 °C ‑ Relative Humidity: 5%‑95 % non‑condensing ‑ Vibration & Shock: Complies with API‑670 power‑plant cabinet EMC standards
Mechanical Data
‑ Dimension(W×H×D):25.4 mm ×120.7 mm ×251.5 mm ‑ Weight: approx 0.34 kg
Core Functions
- Keyphasor signal conditioning: Receive pulse signal from shaft key‑phasor transducer, complete signal shaping and digital conversion.
- Rack‑wide phase reference source: Distribute synchronized timing signal to all vibration and displacement monitor cards through backplane bus for phase‑angle calculation.
- Rotational‑speed measurement: Calculate real‑time shaft rotational speed, provide speed value for overspeed monitoring and start‑up / coast‑down data recording.
- Dynamic diagnostic support: Provide trigger reference for transient waveform capture, support unit start‑stop data analysis and rotor dynamic balancing work.
- TMR redundant expansion: Two 3500/25 modules can be configured as primary‑backup Keyphasor source for triple‑redundant protection rack.
Installation, Replacement & Critical Warnings
- Module supports hot‑swap; hardware protection loop remains effective during replacement; phase and speed‑related diagnostic data will be missing temporarily.
- Compatibility warning: Direct replacement upgraded model is 149369‑01. Physical dimension is identical, but rack firmware compatibility shall be confirmed before replacement.
- Max 2 pieces per rack (4‑channel Keyphasor). For TMR application, two modules must be installed for redundant key‑phasor signal input.
- After replacement, check OK / TX‑RX LED status; download rack configuration, verify speed reading and phase data output.
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Common failure mode: BNC input‑circuit surge damage, component aging; sensor short‑circuit may burn module front‑end conditioning circuit.
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