Rockwell Automation 20Y PowerFlex Active Front End - Manual (Page 68)

68 Rockwell Automation Publication 20Y-UM001E-EN-P - July 2014
Chapter 2 AFE in IP21 Rittal Enclosure—Installation/Wiring
Disconnecting Common
Mode Capacitors Frame 10 LCL Filter
The Frame 10 AFE LCL Filter contains common mode capacitors that are
referenced to ground. To guard against AFE damage, these devices must be
disconnected
if the AFE is installed on a high resistance grounded distribution
system, or an ungrounded distribution system where the line-to-ground voltages
on any phase exceed 125% of the nominal line-to-line voltage.
To access the common mode capacitors, the LCL Filter must be removed from
the enclosure. To remove the Frame 10 AFE LCL Filter from the IP21 Rittal
enclosure, see the instructions in the PowerFlex Active Front End—Frame 10
Hardware Service Manual, publication 20Y-TG001.
To disconnect the common mode capacitors, remove the jumpers shown in
Figure 33 . For more information on ungrounded system installation, see Wiring
and Grounding Guidelines for Pulse Width Modulated (PWM) AC Drives,
publication DRIVES-IN001.
Figure 33 - AFE Frame 10 LCL Filter Common Mode Capacitor Jumper Locations
ATTENTION: To avoid an electric shock hazard, verify that the voltage on the bus
capacitors has discharged completely before removing or installing jumpers.
Check the DC bus voltage between the +DC and –DC terminals, between the
+DC terminal and the chassis, and between the –DC terminal and the chassis.
The voltage must be zero for all three measurements.
Remove
Three
Jumpers RIGHT SIDE VIEW
OF LCL FILTER
Remove
Three
Jumpers