Rockwell Automation 20Y PowerFlex Active Front End - Manual (Page 69)

Rockwell Automation Publication 20Y-UM001E-EN-P - July 2014 69
AFE in IP21 Rittal Enclosure—Installation/Wiring Chapter 2
Frame 13 LCL Filter
The Frame 13 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 remove the AFE Frame 13 LCL Filter from the IP21 Rittal enclosure, see the
instructions in the PowerFlex Active Front End—Frame 13 Hardware Service
Manual, publication 20Y-TG002.
To disconnect the common mode capacitors, remove the upper guard and then
remove the jumpers shown in
Figure 34 . For more information on ungrounded
system installation, see Wiring and Grounding Guidelines for Pulse Width
Modulated (PWM) AC Drives, publication DRIVES-IN001.
Figure 34 - AFE Frame 13 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
Remove
Three
Jumpers
FRONT VIEW
OF LCL FILTER