Rockwell Automation Publication 750-IN100B-EN-P - July 2017 99
Chapter 5
Power Wiring
Most start-up difficulties are the result of incorrect wiring. Every precaution
must be taken to assure that the wiring is done as instructed. All items must be
read and understood before the actual installation begins.
Grounding Requirements
The safety ground-PE must be connected to system ground. Ground
impedance must conform to the requirements of national and local industrial
safety regulations and/or electrical codes. The integrity of all ground
connections should be periodically checked.
Recommended Grounding Scheme
A single point (PE only) grounding scheme should be used. Some applications
may require alternate grounding schemes, refer to Wiring and Grounding
Guidelines for Pulse Width Modulated (PWM) AC Drives, publication
DRIVES-IN001
, for more information. These applications include
installations with long distances between drives or drive line-ups, which could
cause large potential differences between the drive or line-up grounds.
For installations within a cabinet, a single safety ground point or ground bus
bar connected directly to building steel should be used. All circuits including
the AC input ground conductor should be grounded independently and
directly to this point/bar.
ATTENTION: The following information is merely a guide for proper
installation. Rockwell Automation, Inc. cannot assume responsibility for the
compliance or the noncompliance to any code, national, local or otherwise
for the proper installation of this drive or associated equipment. A hazard of
personal injury and/or equipment damage exists if codes are ignored during
installation.
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