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Details

The MPC4 machinery protection card is the central element in the VM600 series machinery
protection system (MPS), from Meggitt’s Vibro-Meter® product line. This very versatile card
is capable of measuring and monitoring up to four dynamic signal inputs and up to two speed
inputs simultaneously.
The dynamic signal inputs are fully programmable and can accept signals representing
acceleration, velocity and displacement (proximity), among others. On-board multichannel
processing allows measurement of various physical parameters, including relative
and absolute vibration, Smax, eccentricity, thrust position, absolute and differential housing
expansion, displacement and dynamic pressure.
Digital processing includes digital filtering, integration or differentiation (if required),
rectification (RMS, mean value, true peak or true peak-to-peak), order tracking (amplitude and
phase) and measurement of the sensor-target gap.
The speed (tachometer) inputs accept signals from a variety of speed sensors, including systems
based on proximity probes, magnetic pulse pickup sensors or TTL signals. Fractional tachometer
ratios are also supported.
The configuration can be expressed in metric or imperial units. Alert and Danger set points are fully
programmable, as are alarm time delay, hysteresis and latching. The Alert and Danger
levels can also be adapted as a function of the speed or any external information.
A digital output is available internally (on the corresponding IOC4T input/output card) for each
alarm level. These alarm signals can drive four local relays on the IOC4T card and/or can be
routed using the VM600 rack’s Raw bus or Open Collector (OC) bus to drive relays on optional
relay cards such as the RLC16 or IRC4.
The processed dynamic (vibration) signals and speed signals are available at the rear of the rack
(on the front panel of the IOC4T) as analog output signals. Voltage-based (0 to 10 V) and
current-based (4 to 20 mA) signals are provided.

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