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The CMC 16 Condition Monitoring Card is the central element in Vibro-Meter’s VM600 series Condition Monitoring System (CMS).

This intelligent front-end Data Acquisition Unit (DAU) is used in conjunction with the VM600 CMS software to acquire, analyse and transmit results to a host computer via the VM600 series CPU M module with Ethernet controller or directly via serial links.

The inputs are fully programmable and can accept signals representing speed, phase reference, vibration (acceleration, velocity or displacement), dynamic pressure, airgap rotor and pole profile, any dynamic signals or any quasi-static signals. Signals can be input from adjacent Machinery Protection Cards (MPC 4) via the VM600 ‘Raw Bus’ and ‘Tacho Bus’ or externally via the screw terminal connectors on the IOC 16T. The IOC 16T modules also afford signal conditioning and EMC protection and allow inputs to be routed to the CMC 16, which includes 16 programmable tracked anti-aliasing filters, and Analog-to-Digital Converters (ADC). On-board processors handle all control of acquisition, conversion from time domain to frequency domain (Fast Fourier Transform), band extraction, unit conversion, limit checking, and communication with the host system.

The 10 available outputs per channel can include RMS, peak, peak-peak, true peak, true peak-peak values, Gap, Smax, or any configurable band based upon synchronous or asynchronously acquired spectra. Acceleration (g), velocity (in/sec, mm/sec) and displacement (mil, micron) signals are catered for and can be converted for display to any standard. If configured, data is sent to the host computer only on exception, for example, only if the change of value exceeds a pre-defined threshold. Values can also be averaged for smoothing or noise reduction.

Events are generated when values exceed one of the 6 configurable limits, exceed rate-of-change alarms or deviate from stored baselines. However, adaptive monitoring techniques can also be employed to dynamically adjust alarm set points based upon machine parameters such as speed and load.

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