Frame 9 Installation 5-5
Ungrounded and
Unbalanced Installations
CE frame 9 drives are equipped with common mode capacitors that are
referenced to ground. Operating a CE frame 9 drive on an ungrounded
distribution system could result in drive damage.
All frame 9 drives (CE and non-CE) are equipped with a Metal Oxide
Varistor assembly (MOV) to provide voltage surge protection. The MOV is
designed for transient surge suppression only (not continuous operation).
With an ungrounded distribution system the phase-to-ground MOV
connection could become a continuous current path. Therefore, you should
disconnect the MOV ground connection when installing a Frame 9 drive on
an ungrounded distribution system. Refer to publication PFLEX-RM001,
PowerFlex Reference Manual, for information on ungrounded system
installation.
!
ATTENTION: If you intend to operate a Frame 9 drive on an
ungrounded distribution system, you must order a non-CE
PowerFlex High Power drive.
L1
L2
L3
!
ATTENTION: Risk of equipment damage exists if this
wire contacts other circuits in the drive while the drive is
energized. Insulate the lug on this wire with several turns
of electrical tape and anchor the wire so it does not
contact other circuits.
Disconnect and insulate
this wire on ungrounded
systems
Ground stud on
Cross Plate
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