20 Rockwell Automation Publication 520-TD002A-EN-E - May 2015
PowerFlex 527 AC Drive Specifications
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.
Typical Grounding
Ground Fault Monitoring
If a system ground fault monitor (RCD) is to be used, only Type B (adjustable) devices should be used to avoid nuisance
tripping.
Safety Ground - (PE)
This is the safety ground for the drive that is required by code. One of these points must be connected to adjacent building
steel (girder, joist), a floor ground rod or bus bar. Grounding points must comply with national and local industrial safety
regulations and/or electrical codes.
Motor Ground
The motor ground must be connected to one of the ground terminals on the drive.
Shield Termination - SHLD
Either of the safety ground terminals located on the power terminal block provides a grounding point for the motor cable
shield. The motor cable shield connected to one of these terminals (drive end) should also be connected to the motor
frame (motor end). Use a shield terminating or EMI clamp to connect the shield to the safety ground terminal. The
earthing plate or conduit box option may be used with a cable clamp for a grounding point for the cable shield.
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.
SHLD
U/T1
V/T2
W/T3
R/L1
S/L2
T/L3
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