Allen-Bradley 1440-SDM02-01RA, Руководство пользователя, Страница: 76 / 168

76 Rockwell Automation Publication 1440-UM001D-EN-P - September 2016
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 this table. 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.
Table 11 - Band measurement parameters (Continued)
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
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
This table shows the actual Band Frequency Maximum and Minimum
values given different operating speeds for this example. 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