Schenck FNT-L001

  • Product Name: Tachometer / Keyphasor Input Module (VIBROCONTROL 1100/1200)
  • Product Introduction: A specialized input module for Schenck VIBROCONTROL vibration monitoring systems, responsible for acquiring and conditioning pulse signals from speed sensors to derive RPM and keyphasor reference for rotating machinery protection.
Category:
Description
  • Technical Specifications & Performance Parameters:
    • Channels: 1 or 2 independent input channels
    • Signal Types: Eddy-current probes, magnetic velocity sensors, proximity switches
    • Frequency Range: 0.5 Hz – 20 kHz typical
    • Input Impedance: >100 kΩ
    • Trigger Threshold: Configurable via jumpers or software
    • Outputs: RPM value, Keyphasor pulse, alarm relays
    • Accuracy: ±0.1% of reading
    • Supply: 24 V DC from backplane
  • Functional Features: Generates precise once-per-rev keyphasor signal for phase analysis, supports wide amplitude and frequency signals, high-noise immunity, alarm and danger setpoints.
  • Material & Structural Characteristics: Plug-in card for 19″ rack or dedicated VC1100/1200 chassis, gold-plated edge connectors, LED status indicators per channel.
  • Application Scenarios: Turbine, compressor, large fan, and motor condition monitoring; mandatory for rotor dynamics analysis, balancing, and order tracking in power and process industries.
  • Working Principle: Amplifies and shapes incoming sensor sine/square waves, compares against configurable threshold to produce clean TTL/HTL keyphasor pulses, counts pulses over time for RPM calculation.
  • Installation Requirements: Insert into VIBROCONTROL rack backplane; shield sensor cables separately; ensure proper probe gap for eddy-current sensors before module configuration.
  • Usage Precautions: Incorrect trigger threshold causes missing pulses or false RPM; ensure sensor type selection matches input circuit; static discharge can damage high-impedance inputs; calibrate periodically for critical machinery.
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