Rockwell Automation 20P PowerFlex Digital DC Drive - Manual (Page 33)

Rockwell Automation Publication 20P-UM001I-EN-P - February 2013 33
Installation and Wiring Chapter 1
General Grounding
Requirements The drive Safety Ground (PE) must be connected to system ground. Ground
impedance must conform to the requirements of national and local industrial
safety regulations and/or electrical codes. The integrity of all ground connections
should be periodically checked.
For installations within a cabinet, a single safety ground point or ground bus bar
connected directly to building steel should be used. All circuits including the AC
input ground conductor should be grounded independently and directly to this
point/bar.
For installations in distribution systems that have ungrounded or high impedance
neutral connections or systems, see Grounding for Installations in an
Ungrounded or High-Impedance Neutral Ground or System on page
35 .
Figure 9 - Typical Grounding
ATTENTION: In order to comply with the essential requirements of the CE Low
Voltage Directive 2006/95/EC, PowerFlex DC drives may not be powered from a
corner-earthed (TN with one phase earthed) supply system. When operating
PowerFlex DC drives from an IT or impedance-earthed supply system, only
temporary operation is permitted after an earth fault is detected in the power
system.
L1
L2
L3
U V W C D
PE1/
STS
PORT
MOD
NET A
NET B
Earth
All wires (including motor
ground) must be connected
inside the motor terminal box.
Transformer
Safety
Ground
AC
M
ai
ns
S
up
pl
y
AC Line Reactor