Rockwell Automation 1440-VSE02-01RA XM-122 gSE Vibration Module - Manual (Page 78)

Publication GMSI10-UM013D-EN-P - May 2010
68 Configuration Parameters
IMPORTANT
For bands specified in Hz or CPM on an orders-based
spectrum, the Band Measurement value will be zero
when the Band Minimum Frequency and Maximum
Frequency fall completely outside of the frequencies
represented in the spectrum. If any of the band falls within
the spectrum, only that portion will contribute to the Band
value.
Example:
Minimum Frequency = 150 Hz
Maximum Frequency = 250 Hz
FMAX = 10 Orders
The following table shows the actual Band Minimum and
Maximum Frequencies given different input speeds for this
example. Note that when the speed is 10 Hz, the Band
Minimum and Maximum Frequencies fall outside the range
of the FMAX, so the Band value will be zero. When the
speed is 20 Hz, the band will be calculated from 150 to 200
Hz.
Speed
(Hz)
Max Frequency Represented
in Spectrum (Hz)
Band Min
(Hz)
Band Max
(Hz)
40 400 150 250
30 300 150 250
20 200 150 200
10 100 n/a n/a