Disconnecting Movs And Common Mode Capacitors - Allen-Bradley PowerFlex 70 User Manual

1-18 Installation/Wiring

Disconnecting MOVs and Common Mode Capacitors

PowerFlex 70 drives contain protective MOVs and common mode
capacitors that are referenced to ground. To prevent drive damage, these
devices should 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 all the jumper(s) shown in the figure and table
below. See the PowerFlex Reference Manual for more information on
ungrounded system installation.
Figure 1.7 Typical Jumper Locations (C Frame Shown)
Jumper
JP3 – JP2
JP3B – JP3A
Figure 1.8 Phase to Ground MOV Removal
Removes
MOV to Ground
Common Mode Capacitors to Ground
R
Three-Phase
S
AC Input
T
JP2 JP3
JP3B
JP3A
JP3 JP2
Frames
All
C and D
1 2 3 4