Ac Supply Source Considerations - Allen-Bradley PowerFlex 525 User Manual

AC Supply Source
Considerations
Ungrounded Distribution Systems
ATTENTION: PowerFlex 525 contains protective MOVs that are referenced to
ground. These devices must be disconnected if the drive is installed on an
ungrounded or resistive grounded distribution system.
ATTENTION: Removing MOVs in drives with an embedded filter will also
disconnect the filter capacitor from earth ground.
Disconnecting MOVs
To prevent drive damage, the MOVs connected to ground shall be disconnected
if the drive is installed on an ungrounded distribution system (IT mains) where
the line-to-ground voltages on any phase could exceed 125% of the nominal line-
to-line voltage. To disconnect these devices, remove the jumper shown in the
diagrams below.
1. Turn the screw counterclockwise to loosen.
2. Pull the jumper completely out of the drive chassis.
3. Tighten the screw to keep it in place.
Jumper Location (Typical)
Power Module
IMPORTANT Tighten screw after jumper removal.
Phase to Ground MOV Removal
Three-Phase
Rockwell Automation Publication 520-UM001A-EN-E - February 2013
R/L1
S/L2
AC Input
T/L3
Jumper 1 2
Installation/Wiring Chapter 1
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