36 Rockwell Automation Publication 750-UM006C-EN-P - March 2022
Chapter 3 Install the Drive
Ground the Drive
To properly ground the package drive, connect the Safety Ground-PE terminal
to the power-distribution earth-grounding-system through a ground or low
impedance connections. The ground connection must have sufficient current-
carrying capacity to help prevent the build-up of voltages that can result in a
hazard to the connected equipment or a person (as defined by the US National
Electric Code NFPA70, Article 100B). Grounding is done for two basic
reasons: safety (defined above) and noise containment or reduction. While the
safety ground scheme and the noise current return circuit can sometimes share
a path and components, they must be considered different circuits with
different requirements.
See Figure 1 on page 11
for the location of the PE Ground Stud.
See Figure 2 on page 24
for an example of proper grounding.
The drive has an internal ground bus to connect all incoming and outgoing
connector grounds. The drive also has an external ground stud on bottom-
right corner of enclosure to connect the PE ground stud with the earth-
grounding-system.
Grounding Safety Grounds
The object of a safety ground is to verify that all metal work is at the same
power-distribution earth-grounding-system potential, at power frequencies.
Impedance between the drive and the building scheme ground must conform
to the requirements of national and local industrial safety regulations or
electrical codes. These requirements vary based on country, type of
distribution system, and other factors. Periodically check the integrity of all
ground connections.
General safety dictates that all metal parts are connected to the power-
distribution earth-grounding-system with separate copper wire or wires of the
ATTENTION: A hazard of personal injury and equipment damage exists. A
minimum of 10 AWG should be used for the solid earth-grounding-system.
IMPORTANT Grounding and power jumper configuration must be appropriate for EMC
applications. See Drive Power Jumper Configuration in the PowerFlex® 750-
Series AC Drives Installation Instructions, publication 750-IN001
for details.
The On-Machine™ Drive is configured for EMC applications.
IMPORTANT The On-Machine Drive has multiple grounding locations. Refer to the
electrical schematics for specific information about the grounding for your
specific configuration. See the Catalog Number Explanation
on page 16 for
more information about configuration type.
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