1-2 General Installation Information
PowerFlex® 700L Liquid-Cooled Drive User Manual
Publication 20L-UM001D-EN-P
Unbalanced, Ungrounded or Resistive Grounded Distribution Systems
If phase-to-ground voltage will exceed 125% of normal or the supply
system is ungrounded, refer to Wiring and Grounding Guidelines for Pulse
Width Modulated (PWM) AC Drives (publication DRIVES-IN001) for more
information.
Input Power Conditioning
Certain events on the power system supplying a drive can cause component
damage or shortened product life. They are:
• 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.
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.
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.
!
ATTENTION: PowerFlex 700L Liquid Cooled Frame 2, Frame
3A, and Frame 3B drives contain protective MOVs and a
common mode capacitor that are referenced to ground. (The
protective MOVs and common mode capacitor in Frame 3A and
3B drives are mounted in the Input Filter Bay.) These devices
must be disconnected if the drive is installed on a resistive
grounded distribution system or an ungrounded distribution
system.
When installing a...
Refer to Ungrounded or Resistive
Grounded Installations on...
Frame 2 drive Page 2-11
Frame 3A or 3B drive Page 3-22
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