General Grounding Requirements - Allen-Bradley PowerFlex 70 User Manual

1-4 Installation/Wiring

General Grounding Requirements

If the supply system is grounded, 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 1.1 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.
Shield Termination - SHLD
The SHLD terminal located on the Cable Entry Plate provides a
grounding point for the motor cable shield. Refer to
page 1-8
on the Cable Entry Plate (drive end) should also be connected to the
motor frame (motor end). Use a shield terminating or EMI clamp to
connect shield to this terminal.
When shielded cable is used for control and signal wiring, the shield
should be grounded at the source end only, not at the drive end.
R (L1)
S (L2)
T (L3)
for location. The motor cable shield connected to this terminal
U (T1)
V (T2)
W (T3)
PE
SHLD
Figure 1.2 on