Rockwell Automation Publication 750-RM100A-EN-P - August 2019 123
Application References Chapter 11
Notch Filters Configuration
Different applications have different variations of cable length. Based on these
variations, there are three configurations: Fixed Frequency One Filter, Fixed
Frequency Two Filters, or Variable Frequency.
Fixed Frequency One Filter
In this configuration, only one reference notch filter is set in the trolley and/or
gantry drives.
The notch frequency is calculated based on the average length using the
following equation. This can be an acceptable approach when cable length
variation is not large.
Figure 47 - Average Length for Fixed Frequency One Filter Configuration
Fixed Frequency Two Filters
In this configuration, both reference notch filters are set in the gantry and/or
trolley drives. One is set at the average length and one at the maximum length.
This has better performance compared to one filter configuration, and can be
good for greater length variations but can increase move times.
f
1
2
------
g
L
min
L
max
+2
------------------------------------------=
Equation 3
f
1
1
2
------
g
L
min
L
max
+2
------------------------------------------=
Equation 4
f
2
1
2
------
g
L
max
------------=
Equation 5
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