Grounding multiple subpanels, Connecting the ground conductor of the motor cable – Rockwell Automation 8720MC High Performance Drives Installation Manual User Manual
Page 74
Publication 8720MC-IN001D-EN-P — December 2002
3-12
Connecting Your 8720MC
Grounding Multiple Subpanels
To extend the chassis ground to multiple subpanels, refer to Figure
3.5.
Figure 3.5
Subpanels Connected to a Single Ground Point
Connecting the Ground Conductor of the Motor Cable
Connect the ground conductor of the motor cable (drive end) directly
to the drive ground (PE) terminal, not to the enclosure bus bar.
Grounding directly to the drive (and filter, if installed) provides a
direct route for high-frequency current returning from the motor frame
and ground conductor. At the motor end, you should also connect the
ground conductor to the motor case ground stud. Shielded or armored
four-wire cable is required. Refer to Building Your 8720SM Motor
Cables on page 3-3 for more information.
Always follow NEC and
applicable local codes
Ground grid or power
distribution ground
Bonded Ground Bus