Rockwell Automation System Design for the Control of Electrical Noise - Manual (Page 48)

Publication GMC-RM001A-EN-P — July 2001
5-2 Filtering Noise
General Purpose 0-24V ac/dc Filters
The filter diagram shown below forms a classic LC low-pass filter.
Figure 5.1
Filter applied to 24V dc power circuit
Figure 5.2
Universal 0-24V ac/dc grounded common filter
Floating
Common
Grounded
Common
Segregation
+24V Com/Neutral
IMPORTANT
The effectiveness of the LC low-pass filter depends
on a perfect bond between the DIN rail and the
ground plane panel.
Capacitor
Ferrite Sleeve
(choke)
Dirty side
Clean side
DIN rail