Rockwell Automation 22C PowerFlex 400 AC Drive FRN 1.xx - 7.xx - Manual (Page 21)

Installation/Wiring 1-9
PowerFlex 400 Adjustable Frequency AC Drive FRN 1.xx - 7.xx User Manual
Publication 22C-UM001I-EN-P
Ungrounded Distribution Systems
Disconnecting MOVs (Drive Frames C, E and F only.)
To prevent drive damage, the MOVs connected to ground shall be
disconnected if the drive is installed on an ungrounded distribution
system 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 Figure
1.6 .
Figure 1.5 Phase to Ground MOV Removal
Figure 1.6 MOV Jumper Location
Note: Frame D, G and H drives do not contain a MOV to ground
connection and are suitable for operation in both grounded and
ungrounded distribution systems without modification.
AC Supply Source Considerations
ATTENTION: PowerFlex 400 drive frames contain 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.
R/L1
S/L2
T/L3
1 2 3 4
Three-Phase
AC Input
Jumper
Important:
Tighten screw after
jumper removal.
Frame C Frame E and F (Typical)