
Installation/Wiring
1-5
PowerFlex 700S Phase II AC Drive User Manual -
Publication 20D-UM006G-EN-P – July 2008
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.
Recommended Grounding Scheme
A single point (PE only) grounding scheme should be used. Some
applications may require alternate grounding schemes, refer to the Wiring
and Grounding Guidelines for pulse Width Modulated (PWM) AC Drives,
publication number DRIVES-IN001…, for more information. These
applications include installations with long distances between drives or
drive line-ups, which could cause large potential differences between the
drive or line-up grounds.
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 1.1 Typical Grounding
Shield Termination - SHLD
The Shield terminal (see
) provides a grounding
point for the motor cable shield. It must be connected to an earth ground by
a separate continuous lead. The motor cable shield should be connected to
this terminal on the drive (drive end) and the motor frame (motor end). Use
a shield terminating or EMI clamp to connect shield to this terminal.
PE
R
(L1)
S
(L2)
T
(L3)
U
(T1)
V
(T2)
W
(T3)
DC
+
DC
–
Required
Input Fusing
Required Branch
Circuit Disconnect
BR1
BR2