Allen-Bradley PowerFlex 40 Guide De Mise En Route page 5

Typical Grounding
Disconnecting MOVs
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 the figures 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
IP20, NEMA/UL Type Open
Important: Tighten screw after jumper removal.
Phase to Ground MOV Removal
R/L1
S/L2
T/L3
SHLD
Three-Phase
AC Input
U/T1
V/T2
W/T3
IP66, NEMA/UL Type 4X
R/L1
S/L2
T/L3
1
Jumper
English-3
2 3 4