Rockwell Automation 7000L PowerFlex Medium Voltage AC Drive (C Frame) - Classic Control - Manual (Page 120)

2-84 Drive Installation
7000L-UM300I-EN-P – June 2013 7000 “C” Frame
Grounding Practices (cont.) Grounding Requirements and Grounding Specification for
Customers and Power Integrators
An external ground must be attached to the main ground bus. The
grounding means must comply with applicable local codes and
standards. As general guidelines, for information only, the ground
path must be of sufficiently low impedance and capacity that:
• the rise in potential of the drive ground point when subjected to a
current of twice the rating of the supply should be no higher than
4 volts over ground potential.
• the current flowing into a ground fault will be of sufficient
magnitude to cause the protection to operate.
The main grounding conductor(s) should be run separately from
power and signal wiring so that faults:
• do not damage the grounding circuit,
or
• will not cause undue interference with or damage to protection or
metering systems, or cause undue disturbance on power lines.