Table 8 – Rockwell Automation 20P PowerFlex Digital DC Drive User Manual
Page 36
36
Rockwell Automation Publication 20P-UM001I-EN-P - February 2013
Chapter 1
Installation and Wiring
Figure 12 - High Resistance Ground
Grounding the wye secondary neutral through a resistor is an acceptable method
of grounding. Under a short circuit secondary condition, any of the output
phases to ground will not exceed the normal line to line voltage. The resistor is
often used to detect ground current by monitoring the associated voltage drop.
Table 8 - Drive Modifications to Support Ungrounded Wye Neutral or Impedance Grounded
Connections
Frame
Circuit Board
Jumper/Connection
Figure to see for Details
A
Pulse Transformer (FIR1-xx-xx)
Remove jumper S9
on page
B
Pulse Transformer (FIR2-xx-xx)
Remove jumper S9
on page
C
Pulse Transformer (FIR3-xx-xx)
Remove jumper S9
on page
Transient Noise Filter (FIL-31)
Disconnect the filter board yellow/
green (ground) wire from the PE
connection on the drive chassis
on page
D
Pulse Transformer (FIR-D-xx-xx)
Remove capacitors C121 and C122
on page
Overvoltage Clipping (CFSF-xxx)
Remove jumper S1
on page