Rockwell Automation 20D PowerFlex 700 Installation Instructions - Frames 7…10 - Manual (Page 30)

30 Rockwell Automation Publication 20B-IN014H-EN-P - June 2013
PowerFlex 700 Adjustable Frequency AC Drive – Frames 7…10
Unbalanced, Ungrounded, Resistive or B Phase Grounded Distribution Systems
If phase to ground voltage exceeds 125% of normal line to line voltage or the
supply system is ungrounded, refer to the Wiring and Grounding Guidelines for
Pulse Width Modulated (PWM) AC Drives, publication
DRIVES-IN001 .
Input Power Conditioning
Certain events on the power system supplying a drive can cause component
damage or shortened product life. These conditions include:
• The power system has power factor correction capacitors switched in and
out of the system, either by the user or by the power company.
• The power source has intermittent voltage spikes in excess of 6000 volts.
These spikes could be caused by other equipment on the line or by events
such as lightning strikes.
• The power source has frequent interruptions.
If any or all of these conditions exist, it is recommended that the user install a
minimum amount of impedance between the drive and the source. This
impedance could come from the supply transformer itself, the cable between the
transformer and drive or an additional transformer or reactor.
EMC Compliance
Frames 7…10: Drives are CE Certified for use with 400V AC and 480V AC
center grounded neutral power supply systems only. Refer to
page 7 for details.
Cable Trays and Conduit
If cable trays or large conduits are to be used, refer to the guidelines presented in
the Wiring and Grounding Guidelines for Pulse Width Modulated (PWM) AC
Drives, publication
DRIVES-IN001 .
Motor Cable Lengths
Typically, motor lead lengths less than 91 meters (300 feet) are acceptable.
However, if your application dictates longer lengths, refer to the Wiring and
Grounding Guidelines for Pulse Width Modulated (PWM) AC Drives,
publication
DRIVES-IN001 or the PowerFlex 700 Technical Data, publication
20B-TD001 .
ATTENTION: To guard against drive damage, PowerFlex 700 drives contain
protective MOVs and common mode capacitors that are referenced to ground.
These devices must be disconnected if the drive is not installed on a solidly
grounded system. See
page 46 for details.
ATTENTION: To avoid a possible shock hazard caused by induced voltages,
unused wires in the conduit must be grounded at both ends. For the same
reason, if a drive sharing a conduit is being serviced or installed, all drives using
this conduit must be disabled. This helps to minimize the possible shock hazard
from “cross coupled” motor leads.