Rockwell Automation System Design for the Control of Electrical Noise - Manual (Page 56)

Publication GMC-RM001A-EN-P — July 2001
6-4 Contact Suppression
Figure 6.5
Transient absorber
Contact Suppression
Effects The waveform below displays 7.2V peaks across the AC terminals of a
+24V dc power supply. Noise is due to load on the DC circuit being
switched.
Figure 6.6
Unsuppressed inductive load on the DC circuit
Good Solution
Better Solution
Common
Common
+24V dc
+24V dc
Transient absorber
Transient absorber
µs -1 0 1 2 3 4 5 6 7 8 9
-10V
-8
-6
-4
-2
0
2
4
6
8
10V
7.2V pk
Source Omron PSU AC Neutral
DC floating, Unsuppressed Relay