Rockwell Automation 1440-SDM02-01RA XM-124 Standard Dynamic Measurement Module - Manuel (Page 72)

72 Rockwell Automation Publication 1440-UM001C-EN-P - May 2014
Chapter 2 Configure the XM-124 Standard Dynamic Measurement Module
Frequency Maximum Enter the upper limit of the range of spectrum bins to be included in the
band measurement, and the frequency units (Hz or Orders). Set the
value by using the table below. This value must be greater than the Band Frequency
Minimum.
When integrating, the Maximum Frequency may not be set
greater than the 2 kHz analog LPF that is applied to all
integrating measurements.
Frequency Minimum Enter the spectrum bin with the least frequency to be included in the
band measurement.
In this field Values are Comments
Sampling
Mode
Spectrum
Frequency Max
Units
Band Units
Band Frequency
Max
Synchronous Orders Hz 0…5000
Orders 0.01…200
Asynchronous Hz Hz 0…20,000
Orders 0.01…200
IMPORTANT For bands specified in Hz on an orders-based spectrum (Sampling Mode set
to Synchronous with tach), the band measurement value is zero when the
Band Frequency Minimum and Frequency Maximum fall completely
beyond the frequencies represented in the spectrum. If any of the band falls
within the spectrum, only that portion contributes to the band value.
Example
Band Frequency Maximum = 250 Hz
Band Frequency Minimum = 150 Hz
Spectrum Frequency Maximum = 10 Orders
The following table shows the actual Band Frequency Maximum and
Minimum values given different operating speeds for this example. Note
that when the speed is 600 rpm, the Band Frequency Maximum and
Minimum values fall outside the range of the Spectrum Frequency
Maximum, so that the band value is zero. When the speed is 1200 rpm, the
band is calculated from 150…200 Hz.
Speed
(rpm) Max Frequency Represented in
Spectrum (Hz) Band Min
(Hz) Band Max
(Hz)
2400 400 150 250
1800 300 150 250
1200 200 150 200
600 100 N/A N/A