PowerFlex Digital DC Drive User Manual - Publication 20P-UM001C-EN-P - July 2008
1-12 Installation and Wiring
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.
Figure 1.9 Typical Grounding
Safety Ground (PE)
This is the safety ground for the drive that is required by code. This point
must be connected to adjacent building steel (girder, joist), a floor ground
rod or bus bar (see above). Grounding points must comply with national and
local industrial safety regulations and/or electrical codes.
!
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. Although
PowerFlex DC drives are compliant with the requirements of the
CE Low Voltage Directive when powered from an IT or
impedance-earthed supply system, power must be removed from
the drive as soon as possible after an earth fault is detected in the
power system to satisfy CE safety requirements related to the
insulation system of the drive.
Safety
Ground
L1
L2
L3
Earth
U
V
W
C
D
AC Line
Reactor
PE1
/
Transformer
AC Mains Supply
All wires (including motor
ground) must be connected
inside the motor terminal box.
STS
PORT
MOD
NET A
NET B
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