SKF Multilog On-Line System IMx-M User Manual page 135

SKF Multilog On-Line System IMx-M
User Manual
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Filter: Filter roll off factor is 24 dB/Octave (4
Filter and Low Pass Filter.
The deviation in the pass band is within 0,5 dB.
Configuring a filter appropriately is very important:
–
To limit the influence of noise, choose a filter that is as tight as
possible around the frequency band of interest.
–
If possible, it is recommended to use RMS rather than PtP in the
application.
Available Filter Ranges:
–
DC: 0 to 0,625 Hz filter for temperature and process data such as
pressure or flow.
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0 to 10 Hz: narrow range for Eccentricity.
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10 to 1 000 Hz: mostly for velocity (according to API 670).
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1 to 600 Hz:
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4 to 4 000 Hz:
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5 to 1 000 Hz: for equipment with shaft speed of 300 to 750 rpm.
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10 to 5 000 Hz: for a specified acceleration.
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1 000 to 10 000 Hz: mostly for acceleration.
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User defined: allows user to manually set the filter ranges.
Limitations on Low Pass Filter Usage:
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For low pass filter > 1 000, no Integration allowed.
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For low pass filter > 2 400, no combined measurements allowed.
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For low pass filter > 4 800, only one channel in the pair may be used.
Limitations on High Pass Filter Usage:
–
For high pass filter < 5 Hz, no integration allowed and measurement
time will increase.
Limitations on User Defined Filter Usage:
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High pass filter >= 1 Hz
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150 Hz <= low pass filter <= 5 000 Hz. Additionally low pass filter can
also be set to 10 000 Hz.
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Low pass filter > 5,7 * high pass filter. However, filter band of 30150
Hz and 100300 Hz are allowed.
–
The limitations on both low and high pass filter usages stated above
are also applied to the limitations on the user defined filter usage.
Protection Module Configuration with IMx-M Manager
Protection
th
order) for both High Pass
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