Rockwell Automation System Design for the Control of Electrical Noise - Manual (Page 111)

Publication GMC-RM001A-EN-P — July 2001
Noise Control Supplement A-9
Grounding the Common
Grounding the DC common of the power supply attenuates
common-mode noise dramatically. A sample wiring diagram is shown
in the figure below.
Figure A.7
DC power supply wiring (grounded common)
24V dc PSU
AC Filter
+24V 24V com
Dirty Load