Vibro-Meter  VM600 MPC4 machinery protection  card

KEY FEATURES AND BENEFITS

• From the Vibro-Meter® product line 

• Continuously online machinery protection card 

• Real-time measurement and monitoring using state-of-the-art DSP techniques 

• 4 dynamic signal channels and 2 tachometer (speed) channels, all individually programmable 

• Programmable broad-band and narrow-band filters 

• Simultaneous amplitude and phase monitoring in order-tracking mode 

• Programmable Alert, Danger and OK set points 

• Adaptive Alert and Danger levels 

• Front-panel BNC connectors for easy analysis of buffered “raw” sensor signals 

• Front-panel LEDs indicate status and alarms

KEY BENEFITS AND FEATURES (continued)

• Integrated power supplies for sensors and signal conditioners such as IEPE accelerometers and proximity measurement systems 

• Live insertion and removal of cards (hot-swappable) 

• Available in “standard”, “separate circuits” and “safety” (SIL) versions

MPC4 card 

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.

Dynamic signal inputs 

Number of inputs : 

4 per MPC4 card 

DC range : 0 to +20 V or 0 to −20 V 

AC range : ±10 V max. 

Common mode voltage range : −50 to +50 V 

CMRR : >60 dB at 50 Hz 

Crosstalk : −72 dB 

Input impedance : 200 kΩ 

Current input range 

• DC signals : 0 to 25 mA 

• AC signals : ±8 mA max. Analog frequency range : DC to 60 kHz (−3 dB). Note: Applicable when dynamic signal outputs are shared using the Raw bus (VM600 rack). Dynamic signal outputs can be shared with XMx16/XIO16T card pairs but cannot be shared with other MPC4/IOC4T card pairs.

Analog AC frequency range

• Without integration : 0.1 Hz to 10 kHz 

• With integration : 2.5 Hz to 10 kHz 

Current measuring resistor : 324.5 Ω

Buffered dynamic signal outputs

The buffered “raw” dynamic signal outputs are available on the front-panel BNC connectors (MPC4 card) and the screw-terminal connectors (IOC4T card). 

Output impedance : 50 Ω 

Analog frequency range :

DC to 10 kHz (−0.1 dB with a load >1 MΩ). 

DC to 10 kHz (−0.2 dB with a load >200 kΩ). 

DC to 40 kHz (−3 dB).

Analog (DC) outputs and discrete outputs

Analog (DC) outputs and discrete outputs (relays) are available on the associated IOC4T card. Refer to the IOC4T input/output card data sheet for further information.