Rockwell Automation 22A PowerFlex 4 User Manual FRN 6.xx - Manual (Page 15)

Installation/Wiring 1-5
Ground Fault Monitoring
If a system ground fault monitor (RCD) is to be used, only Type B
(adjustable) devices should be used to avoid nuisance tripping.
Safety Ground - (PE)
This is the safety ground for the drive that is required by code. One of
these points must be connected to adjacent building steel (girder, joist), a
floor ground rod or bus bar. Grounding points must comply with
national and local industrial safety regulations and/or electrical codes.
Motor Ground
The motor ground must be connected to one of the ground terminals on
the drive.
Shield Termination - SHLD
Either of the safety ground terminals located on the power terminal
block provides a grounding point for the motor cable shield. The motor
cable shield connected to one of these terminals (drive end) should also
be connected to the motor frame (motor end). Use a shield terminating or
EMI clamp to connect the shield to the safety ground terminal. The
conduit box option may be used with a cable clamp for a grounding point
for the cable shield.
When shielded cable is used for control and signal wiring, the shield
should be grounded at the source end only, not at the drive end.
RFI Filter Grounding
Using single phase drives with integral filter, or an external filter with
any drive rating, 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.