MEGGITT

MEGGITT Machinery protection card

Type MPC4

200-510-sss-1Hh

200-510-sss-2Hh

200-510-sss-3Hh

© Meggitt SA / 268-021 / Version 10 / 13.04.2017 / E 1 / 7
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MPC4
Machinery protection card
Type MPC4
FEATURES
» 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 inputs and 2 tachometer
(speed) inputs, 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
raw signals
» 7 front panel LEDs show status and alarms
» Integrated power supply for many Vibro-Meter
front-ends, including ICP accelerometers and
proximity systems
» Live insertion and removal of cards
» Available in ‘standard’, ‘separate circuits’ and
‘safety’ (SIL) versions

Machinery protection card
MPC4
2 / 7 © Meggitt SA / 268-021 / Version 10 / 13.04.2017 / E
DESCRIPTION
MPC4 card
The MPC4 machinery protection card is the central
element in the VM600 series machinery protection
system (MPS), from Meggitt Sensing Systems’
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 multi-channel processing allows
measurement of various physical parameters,
including relative and absolute vibration, S max ,
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 transducer-target gap.
The speed (tachometer) inputs accept signals from a
variety of speed sensors, including systems based on
proximity probes, magnetic pulse pick-up sensors or
providing TTL signals. Fractional tacho ratios are also
supported.
The calibration may 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 be
adapted as a function of the speed or any external
information.
A digital output is available internally (on the
corresponding IOC4T card) for each alarm level.
These alarm signals may be routed on a bus within
the VM600 rack to drive relays on optional relay cards
(such as the IRC4 and RLC16).
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.
The MPC4 performs a self-test and diagnostic routine
on power-up. In addition, the card’s built-in
“OK System” continuously monitors the level of
signals provided by the sensors and indicates any
problem due to a broken transmission line, faulty
transducer or conditioner.
An LED indicator on the MPC4 front panel indicates
whether a processing or hardware error has occurred.
Six additional LEDs (one per input channel) indicate
whether the OK System has detected a fault and
whether an alarm has occurred on the channel.
The MPC4 card is available in three versions: a
‘standard’ version, a ‘separate circuits’ version and a
‘safety’ (SIL) version, all of which function as a card
pair using an IOC4T input / output card.
‘Standard’ and ‘safety’ (SIL) versions of the MPC4
Both the ‘standard’ version and the ‘safety’ (SIL)
version of the MPC4 card are certified to IEC 61508
and ISO 13849.
The ‘standard’ MPC4 card is the original version,
intended for safety systems using a VM600 rack with
a limited range of cards, that is, ‘standard’ MPC4 /
IOC4T card pairs and RLC16 relay cards. It has a
VME-compatible slave interface and is fully software
configurable via RS-232 (on the front panel of the
card) or VME.
The ‘safety’ MPC4 card, also known as the MPC4
SIL, was developed to permit a wider range of
installation options. Specifically, VM600 racks that
also contain condition monitoring cards (such as the
CMC16 and XMx16) and relay cards (such as the
IRC4 and RLC16). To safety certify these
configurations, it was necessary to ensure that the
‘safety’ MPC4 is isolated from the other cards in a
VM600 rack, so that there is no possibility of its
configuration being inadvertently modified.
Therefore, the ‘safety’ (SIL) version of the MPC4 does
not include a VME-compatible slave interface, nor
does it provide all of the signal processing capabilities
of the ‘standard’ MPC4 card (see Specifications –
‘standard’ and ‘separate circuits’ MPC4 cards only on
page 6).
Segregation of MPS and CMS
The VM600 rack, machinery protection cards,
condition monitoring cards and associated software
are designed for compliance with the machinery
protection system (MPS) and condition monitoring
system (CMS) “segregation” requirements of the
API 670 standard, which ensures that the functionality
of the MPS does not depend on and is not

© Meggitt SA / 268-021 / Version 10 / 13.04.2017 / E 3 / 7
Machinery protection card
MPC4
DESCRIPTION (continued)
compromised in any way by the operation of the
CMS.
So although machinery protection cards and condition
monitoring cards can easily share sensor signals from
measurement chains, MPC4/IOC4T card pairs do not
share any communication buses with XMx16/XIO16T
condition monitoring card pairs in a VM600 rack, and
MPC4/IOC4T card pairs are configured and operated
using the VM600 MPSx software (while XMx16/
XIO16T card pairs are configured and operated using
the VibroSight ® software).
Applications information
The MPC4 cards are highly suitable for machinery
protection in a wide range of industrial applications.
For further information on the use of MPC4 cards,
refer to the VM600 Functional Safety Manual
MAVM600-FS / E. For specific applications, contact
your nearest Meggitt Sensing Systems
representative.
SPECIFICATIONS – ALL MPC4 CARDS
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 (maximum)
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 (maximum)
Analog AC frequency band
(without integration)
: 0.1 Hz to 10 kHz
Analog AC frequency band
(with integration)
: 2.5 Hz to 10 kHz
Analog frequency band for throughput to
other cards and buffered AC outputs
: DC to 60 kHz (−3 dB)
Current measuring resistor : 324.5 Ω
Processing options
Broad-band
Filtering options : High-pass, low-pass or band-pass
LP/ HP ratio in pass band : 500 (maximum)
Ripple : ± 0.3 dB
Slope : 6 to 60 dB / octave (software configurable)
Attenuation outside pass band : > 50 dB
Amplitude accuracy : ± 1 % of full-scale
Linearity error : < ± 1 %
Equivalent input noise
(without integration)
: < 200 μV RMS

Machinery protection card
MPC4
4 / 7 © Meggitt SA / 268-021 / Version 10 / 13.04.2017 / E
Narrow-band (tracking)
The ‘standard’ and ‘separate circuits’ versions of the MPC4 card support narrow-band tracking (see Specifications –
‘standard’ and ‘separate circuits’ MPC4 cards only on page 6).
The ‘safety’ MPC4 card does not support narrow-band tracking.
Relative shaft vibration
Frequency band
• Vibration : 0.1 Hz to 10 kHz
• Gap / position : DC to 1 Hz
Amplitude accuracy
• Vibration : ± 1.2 % of full-scale
• Gap / position : ± 1 % of full-scale
• Linearity error : < ± 1 %
Initial gap / offset compensation : Available
Buffered (raw) dynamic signal outputs
These signals are available on the MPC4 card’s BNC outputs and the IOC4T card’s raw outputs.
Frequency range : DC to 10 kHz (−0.1 dB or 1 %).
DC to 60 kHz (−3 dB).
Admissible load on output : > 50 kΩ
Amplitude error : < 2 %
Phase error : < 5° (DC to 10 kHz)
Transfer ratio
• Voltage input : 1 V/ V
• Current input : 0.3245 V/ mA
Speed / phase reference inputs and outputs
The ‘standard’ and ‘separate circuits’ versions of the MPC4 card support speed / phase reference inputs and outputs
(see Specifications – ‘standard’ and ‘separate circuits’ MPC4 cards only on page 6).
The ‘safety’ MPC4 card does not support speed / phase reference inputs and outputs.
Alarm programming
Level detectors
• Vibration systems : Over-level switching (A+, D+) and under-level switching (A−, D−)
• Accelerometer systems : Over-level switching (A+, D+)
• Speed channel : 2 Alert levels (A−, A+)
Alarm scanning interval : 100 ms (maximum)
Alarm level value : User-programmable within range
Hysteresis : User-programmable within range
Latching : User-programmable within range
Alarm delay time : User-programmable within range
Alarm outputs : Individual alarms and common alarms (open-collector transistor)
Adaptation criteria (for adaptive
monitoring)
: Speed or digital input
Logical combinations : AND, OR, majority voting logic
Number of logical combinations : 8 basic functions and 4 advanced functions