Input power conditioning, General grounding requirements – Rockwell Automation 20L PowerFlex 700L Liquid-Cooled Adjustable Frequency AC Drive User Manual
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General Installation Information
PowerFlex 700L Frames 2, 3A, and 3B Liquid-Cooled AC Drives User Manual
Publication 20L-UM001E-EN-P
The kVA of all PowerFlex 700L drives on the distribution system and the
system impedance of upstream transformers should be taken into account.
Unbalanced, Ungrounded or Resistive Grounded Distribution Systems
If phase-to-ground voltage will exceed 125% of normal or the supply
system is ungrounded, see 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. These events include the following:
• 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.
!
ATTENTION: To guard against personal injury and/or equipment
damage caused by improper circuit breaker selection, use only the
recommended circuit breakers specified in
Table 1.A
.
!
ATTENTION: PowerFlex 700L Liquid Cooled Frame 2, 3A,
and 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.
Drive Frame Size
See Ungrounded or Resistive
Grounded Installations on...
2
3A or 3B