Rockwell Automation Publication 2099-UM001D-EN-P - December 2012
77
Connect the Kinetix 7000 Drive System
Chapter 4
Power Distribution Systems Without a Ground Reference
Kinetix 7000 drives contain protective MOVs and Common Mode Capacitors
that are referenced to ground. To guard against unstable operation and/or drive
damage, these devices must be disconnected if the drive is installed on an
ungrounded, impedance grounded, high resistive grounded, B phase grounded,
or common DC bus power distribution system.
Figure 46 - Ungrounded Power Wiring
ATTENTION:
Disconnect the protective MOVs and capacitors if the drive is
installed on a high resistive grounded or ungrounded system where the line-to-
ground voltages on any phase exceed 125% of the nominal line-to-voltage.
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 a common DC bus 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
