Rockwell Automation 20T PowerFlex Diode Bus Supply - Manual (Page 16)

1-4 Installation/Wiring
PowerFlex Diode Bus Supply User Manual
Publication 20T-UM001D-EN-P
General Grounding
Requirements Safety Ground Terminal - PE
The Safety Ground terminal (PE) must be connected to the building
grounding scheme. Ground impedance must conform to the requirements
of national and local industrial safety regulations and/or electrical codes.
This is the safety ground for the Diode Bus Supply. The integrity of all
ground connections should be periodically checked.
For installations within a cabinet, a single safety ground point or ground bus
bar connected directly to building steel (girder, joist), a floor ground rod,
bus bar or building ground grid should be used. All circuits including the
AC input ground conductor should be grounded independently and directly
to this point/bar.
Figure 1.1 Typical Grounding
RFI Filter Grounding
Using an external RFI filter may result in relatively high ground leakage
currents. Therefore, the filter must only be used in installations with
grounded AC supply systems and be permanently installed and solidly
grounded (bonded) to the building power distribution ground. Ensure that
the incoming supply neutral is solidly connected (bonded) to the same
building power distribution ground. Grounding must not rely on flexible
cables and should not include any form of plug or socket that would permit
inadvertent disconnection. Some local codes may require redundant ground
connections. The integrity of all connections should be periodically
checked. See the instructions supplied with the filter.
+DC
- DC
R (L1)
S (L2)
T (L3)
PE
Ground Grid, Girder or Ground
Rod (Building Ground Potential)