76 Rockwell Automation Publication 2099-UM001G-EN-P - December 2022
Chapter 4 Connect the Kinetix 7000 Drive System
Ungrounded Power Configurations
Kinetix 7000 drives contain protective MOV devices and common-mode
capacitors that are referenced to ground. Disconnect the protective MOV devices
and capacitors if the drive has an ungrounded, impedance-grounded, or corner-
grounded power configuration where the line-to-ground voltages on any phase
exceeds 125% of the nominal line-to-voltage.
Figure 47 - Ungrounded Power Wiring
ATTENTION: To avoid unstable operation and/or drive damage, these devices
must be disconnected if the drive has an ungrounded, impedance-grounded, or
corner-grounded power configuration.
Ungrounded systems do not reference each phase potential to a power distribution
ground. This can result in an unknown potential to earth ground.
A Kinetix 7000 drive application using an active converter for DC-bus voltage is
considered an ungrounded power distribution system.
L1
L2
L3
2099-BM08-S Shown with Lower
Front Panel Removed
Conduit/4-Wire Cable
Three-Phase Input
VAC
Ground
Bonded Cabinet
Ground
Ground Grid or Power
Distribution Ground
to Ground Stud
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