Rockwell Automation 1500 DeviceNet MV Controllers Installation Instructions - Manual (Page 22)

6-2 DeviceNet Power Supply
1500-IN057C-EN-P – June 2013
Figure 6.1 – LV Panel of Incomer with DeviceNet Power Supply
Network Grounding at the Power Supply
The DeviceNet cable must be grounded at only one location. The ideal
choice is at the power supply. Ground the power supply and 24 Vdc
common (black wire).
Best Grounding Practice

If the power supply comes installed in the MV controller, the black
24 Vdc common terminal is grounded to a TE ground within the MV
controller; the TE ground is connected to the cabinet ground bus. To
improve the grounding, disconnect the black 24Vdc common from
the TE ground then use #8 AWG green wire and ground the black 24
Vdc common terminal to a very stable ground external to the MV
controller line-up.
 If the power supply is external, use the #8 AWG green wire and
ground the black 24 Vdc common terminal to a very stable ground.
Note:
Optional equipment
is also shown.