Technical & Performance Specifications
- Analog Input Channel Count: 16 fully programmable input channels
- ADC Resolution: 14-bit per dedicated channel, transmitted data truncated to 12-bit + sign; resolution 1/4096 full scale
- Max Single Channel Sampling Rate: 100 kHz
- AC Measurement Full Scale Ranges (Switch Selectable): 0.1 V, 0.2 V, 0.5 V, 1.0 V, 2.0 V, 4.0 V, 10.0 V, 20.0 V FSD
- DC Measurement Full Scale Range: ±24 V FSD
- Thermocouple Input Full Scale: 61.022 mV FSD
- Signal Frequency Bandwidth: Max 20 kHz (-3 dB); minimum AC cutoff frequency 0.16 Hz high-pass filter
- Anti-Aliasing Attenuation: 70 dB at frequencies above 1.56×cutoff frequency
- Signal-to-Noise Ratio: >70 dB below 10 kHz; >60 dB at 20 kHz
- Channel Crosstalk Isolation: < -75 dB between adjacent input channels
- Max Common Mode Input Voltage: 50 V for vibration/process signals; 3 V for thermocouple inputs
- On-board Signal Processing: 3200-line high-resolution FFT calculation engine
- Processed Outputs: 10 configurable frequency band/time-domain derived outputs per channel
- Alarm Thresholds: 6 independent configurable alarm levels with hysteresis deadband per processed output
- On-board Storage: Circular buffer for scheduled, alarm-triggered and exception event data logging
- Backplane Communication Bus: VM600 Raw Bus, Tacho Bus high-speed parallel backplane
- Front Panel Indication: Tri-color LED per channel for running, fault and alarm status
Function Features
- Universal input compatibility: acceleration/velocity/displacement vibration sensors, eddy current displacement probes, tachometer speed/phase reference signals, dynamic pressure transducers, thermocouples
- Synchronous and asynchronous multi-channel sampling modes configurable per application
- Live insertion hot-swap capability without powering down entire VM600 rack
- Per-channel programmable tracked anti-aliasing filters matching sensor frequency response
- Local on-card alarm logic processing independent of system CPU module
- Compatibility with IOC16T signal conditioning terminal modules for EMC surge protection and wiring breakout
- Seamless data upload to VM CMS machinery condition monitoring analysis software
Working Principle
External dynamic sensor signals enter the module via backplane or front terminal IOC modules, pass through channel-specific programmable analog filters to eliminate aliasing noise. Dedicated per-channel ADC converts analog waveforms to digital sampling data, which is fed to the on-board FFT processor for frequency spectrum decomposition. Derived vibration metrics (peak-to-peak, RMS, frequency band energy) are calculated locally, compared against user-set alarm thresholds, and buffered in on-board memory. Processed diagnostic data is transmitted over the VM600 backplane bus to rack CPU modules or Ethernet host systems for long-term trending and machinery fault diagnosis.
Material & Structural Composition
- Front panel: Anodized aluminum alloy with laser-etched channel identification labels and LED viewing windows
- Circuit board: Multi-layer FR4 PCB with reinforced gold-plated backplane edge connectors
- Internal shielding: Copper foil electromagnetic shielding partitions separating analog and digital circuit zones
- Mechanical frame: Die-cast aluminum module chassis for rack vibration resistance
Advantage Highlights
- Single module consolidates 16 measurement channels to minimize rack slot consumption
- On-board high-speed signal processing reduces CPU module calculation load and data transmission latency
- Per-channel fully isolated signal circuits eliminate cross-channel interference in dense machinery monitoring racks
- Hot-swap design enables maintenance without full system shutdown for continuous power plant operation
- Wide frequency measurement bandwidth covers low-speed rotor thermal drift and high-speed bearing defect vibration signatures
- Integrated alarm hysteresis eliminates false alarm triggering from minor signal fluctuation
Applicable Industries
Thermal power generation steam/gas turbines, petrochemical centrifugal compressors, hydroelectric generators, steel mill large rotating motors, offshore oil & gas turbomachinery, nuclear plant rotating auxiliary equipment
Installation Requirements
- Mounting standard: VM600 19-inch rack slot vertical card insertion, fixed via front panel captive screws
- Backplane compatibility: Must install within VM600 series rack equipped with VM600 CPU M communication master module
- Input wiring: Shielded twisted pair instrumentation cable, cable shielding grounded at terminal module side only
- Rack environmental control: Cabinet operating temperature maintained 0°C ~ 55°C; humidity 5%–95% non-condensing
Operation & Maintenance Notes
- Verify matching input full-scale voltage range with connected sensor output before power activation
- Perform annual signal channel calibration using certified vibration signal generators
- Prevent metal debris ingress into rack backplane connectors during module replacement
- Hysteresis deadband values must be configured to avoid repetitive alarm flicker on marginal vibration signals
- All thermocouple input wiring must use matching type extension wire to eliminate cold junction measurement error
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