Rockwell Automation 1336T Wiring and Grounding Guide, (PWM) AC Drives - Manual (Page 51)

Rockwell Automation Publication DRIVES-IN001M-EN-P - March 2014 51
Grounding Chapter 3
Figure 15 - Cabinet Grounding with a TN-S Five-wire System
Noise Related Grounds Use appropriate grounding schemes to reduce noise when installing PWM AC
drives to reduce output that can produce high frequency common mode
(coupled from output to ground) noise currents. These noise currents can cause
sensitive equipment to malfunction if they are allowed to propagate.
L1
L2
L3
PEN or N
PE
R
S
T
R
S
T
PE PE
PE
Input Transformer
System Cabinet
AC Drive
Single-
Phase
Device
Cabinet Ground Bus
X
0
R
S
T
U
V
W
PE
A
B
C
PE
C
lg-m
C
lg-c
V
ng
Input Transformer
AC Drive
Path for Common
Mode Current
Motor Frame
Motor
Feedback
Device
Path for Common
Mode Current
Path for Common
Mode Current
Path for Common
Mode Current
Path for Common
Mode Current
System Ground