MEGGITTVM600Mk2 MPC4Mk2 + IOC4Mk2 machinery protection and condition monitoring module

Note: 10 Hz DC filter (see DC filtering on page 6).

• Current measurement range : ±50 mAPEAK-PEAK (AC + DC input)

Input impedance

• Voltage : ≥100 kΩ, between the differential (high and low) inputs

• Current : 200 Ω ±0.2%

Dynamic input range : ≥72 dB

DC filtering

DC filter

• Cutoff frequency (−3 dB) : 10 Hz ±3.5 Hz

• Roll-off : −40 dB/decade (second order)

Note: The DC filter is used to extract the DC part of an auxiliary input when it is configured as a DC input.

Sensor/measurement chain OK check

Number of levels : Up to 16 configurable threshold levels (16 DC regions)

OK level range

• Voltage inputs : ±20 VDC

• Current inputs : 0 to 23 mA

Operating principle

• SIL safety sensors : Line-fault detection of conditions such as a problem with the sensor 

and/or cabling, problem with the signal conditioner, and/or other 

problem with the measurement chain or power supply.

Note: Requires a SIL safety sensor/measurement chain that 

provides a suitable diagnostic signal (DC bias level), for example, 

measurement chains using IPC707 or IQS900 signal conditioners.

• Standard sensors : Powered sensors – line-fault detection of conditions such as

open-circuit or short-circuit.

Unpowered sensors – line-fault detection of conditions such as

open-circuit.

Digital signal processing

Analogue to digital converter (ADC) : 24 bit

Dynamic range : ≥80 dB

Frequency bandwidth : 0 Hz to 20 kHz

Accuracy

• Amplitude : ≤1% of input full scale

• Phase : ≤1.5°

Digital filtering

• Notch filter : 50 or 60 Hz

• ISO 2954 filter : 10 Hz to 1 kHz (−3 dB), −24 dB/octave

• Band-pass filter : <0.1 dB ripple in pass band, >55 dB attenuation in stop band,

0.1 or 3 dB attenuation at cutoff, −24 to −60 dB/octave slope

• High-pass filter : 0.25 to 400 Hz

• Low-pass filter : 10 Hz to 20 kHz

Data acquisition : Fixed frequency or order tracking

Fixed frequency : Frequency span: 0.25 Hz to 20 kHz.

Note: The low-pass filter (LPF) cutoff frequency to high-pass filter 

(HPF) cutoff frequency ratio must be less than 400 when the HPF 

cutoff frequency is less than 3 Hz. See also Digital filtering above.

Order tracking : Digital resampling.

Tracking range: 300 to 6000 RPM (default).

Frequency span: DC to 3.125, 6.25, 12.5, 25, 50 or 100 orders.

Waveform averaging: 1 (default).

Note: Order tracking requires a reference speed (auxiliary input 

configured as a tacho/speed channel).

Measurement resolution : 2 048, 4096, 8192 or 16384 point waveform /

800, 1600, 3200 or 6400 line spectrum

FFT window types : Blackman, Blackman-Harris, Flat top, Hamming, Hanning, 

Kaiser α=1, Kaiser α=5, Kaiser α=10, Rectangular or Tukey α=0.5.

Note: Hanning is the default window type.

FFT resolution : 800, 1600, 3200 or 6400 spectral lines

Data sampling rate : 2.56 × frequency bandwidth

Extracted data (measurements) : Up to 10 processed outputs per channel/processing function.

See Processing functions on page 10.

Extracted data types : Time domain measurements: Scalar.

Frequency domain measurements: Scalar, Vector and Phasor.

Fixed-frequency measurements : Time domain or Frequency domain measurements.

Time domain measurements: Overall (Scalar).

Frequency domain measurements:

Single frequency – nX (Amplitude + Phase (Vector)),

Band – Band start to Band stop (Amplitude (Scalar)),

Highest peak – Band start to Band stop (Amplitude + Phase 

+ Frequency (Phasor)).

Order-tracking measurements : Frequency domain measurements only.

Frequency domain measurements:

Single frequency – nX (Amplitude + Phase (Vector)),

Band – Band start to Band stop (Amplitude (Scalar)),

Highest peak – Band start to Band stop (Amplitude + Phase 

+ Frequency (Phasor)).

Integration count : 0, 1 or 2 (Acceleration to Velocity or Displacement), as required

Measurement types : Time domain measurements: True RMS, True Peak, True Peak-peak, 

True Average.

Frequency domain measurements: Amplitude + Phase (Vector).

Note: True RMS and True average measurements have a 

configurable Response time (400 ms default). True Peak and 

True Peak-peak measurements have a configurable Decay time 

(4700 ms default).

Qualifiers (rectifiers) : Time domain measurements: True RMS, True Peak, True Peak-peak, 

True Average, Scaled Peak, Scaled Peak-peak or Scaled Average.

Frequency domain measurements: RMS, Peak, Peak-peak or 

Average.

Update rate – internal

(MPC4Mk2 module)

: 20 ms min. for time domain processing.

100 ms min. for frequency domain processing.

Note: MPC4Mk2 + IOC4Mk2 and RLC16Mk2 relays are also updated 

every 20 ms.

Update rate – external

(VibroSight Capture condition 

monitoring data update rate) 

: Configurable as 100 ms, 200 ms, 500 ms, 1 s, 2 s or 5 s.

Note: 1 s is the default VibroSight Capture condition monitoring 

update rate.

Update rate – external

(VibroSight Capture condition 

monitoring data logging rule rate) 

: Configurable between 100 ms and 99 days

Update rate – external

(VibroSight Vision live data 

display interval)

: Configurable as 100 ms, 200 ms, 500 ms, 1 s, 2 s, 5 s, 10 s, 20 s, 50 s, …

Machinery protection system (MPS) functionality / processing

Measurement resolution

(fixed)

: 2048 point waveforms / 800 line spectra