Rockwell Automation 1440-RMA00-04RC XM-440 Master Relay Module - Manual (Page 16)

Rockwell Automation Publication GMSI10-UM009D-EN-P - June 2011
16 Installing the XM-440 Master Relay Module
Grounding Requirements
Use these grounding requirements to ensure safe electrical operating
circumstances, and to help avoid potential emi and ground noise that can cause
unfavorable operating conditions for your XM system.
DIN Rail Grounding
The XM modules make a chassis ground connection through the DIN rail.
The DIN rail must be connected to a ground bus or grounding electrode
conductor using 8 AWG or 1 inch copper braid. See Figure 2.2.
Use zinc-plated, yellow-chromated steel DIN rail (Allen-Bradley part no.
199-DR1 or 199-DR4) or equivalent to assure proper grounding. Using other
DIN rail materials (e.g. aluminum, plastic, etc.), which can corrode, oxidize, or
are poor conductors can result in improper or intermittent platform
grounding.
IMPORTANT
See Application Technique "XM Power Supply Solutions",
publication ICM-AP005A-EN-E, for guidance in
architecting power supplies for XM systems.