Rockwell Automation Publication 750-UM006C-EN-P - March 2022 37
Install the Drive Chapter 3
appropriate gauge. Most equipment has specific provisions to connect a safety
ground or PE (protective earth) directly to it.
Grounding PE or Ground
The safety ground or PE, must be connected to the power-distribution earth-
grounding-system. This ground point must be connected to adjacent building
steel (girder, joist), a floor ground rod, busbar, or building ground grid.
Grounding points must comply with national and local industrial safety
regulations or electrical codes. Some codes can require redundant ground paths
and periodic examination of connection integrity.
Shield and Ground Motors
and Motor Cables
The motor frame or stator core must be connected directly to the PE
connection with a separate ground conductor. We recommend that each motor
frame is grounded to building steel at the motor.
Refer to Tab le 4 on pa g e 3 9
for motor cable information.
Keep the motor cable lengths less than 13.7 m (45 ft) unless otherwise noted in
the device specifications.
IMPORTANT The safety ground (PE), must be connected to the power-distribution earth-
grounding-system. Some codes may require redundant ground paths and
periodic examination of connection integrity.
IMPORTANT To avoid electrolytic corrosion on the external earth terminal, avoid spraying
moisture directly on the terminal. When used in wash-down environments
apply a sealant or other corrosion inhibitor on the external ground terminal
to minimize any negative effects of galvanic or electro-chemical corrosion.
Ground connections must be inspected regularly.
ATTENTION: Shielded motor cable is mandatory for CE-compliant
installations. Failure to comply will result in equipment damage.
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