Rockwell Automation 20B PowerFlex 700 Installation Instructions - Frames 0…6 - Manual (Page 21)

Rockwell Automation Publication 20B-IN019E-EN-P - July 2013 21
PowerFlex 700 Adjustable Frequency AC Drive – Frames 0…6
Step 3: Wire the Drive –
Power Special Considerations
PowerFlex 700 drives are suitable for use on a circuit capable of delivering up to a
maximum of 200,000 rms symmetrical amperes.
If a system ground fault monitor (RCD) is to be used, only Type B (adjustable)
devices must be used to avoid nuisance tripping.
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 are divided into 2 basic
categories:
1. All drives
• 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.
2. 5 Hp or Less Drives (in addition to “ 1 ” above)
• The nearest supply transformer is larger than 100 kVA or the available
short circuit (fault) current is greater than 100,000A.
• The impedance in front of the drive is less than 0.5%.
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. The impedance
can be calculated by using the information supplied in Wiring and Grounding
Guidelines for Pulse Width Modulated (PWM) AC Drives, publication
DRIVES-IN001 .
ATTENTION: To guard against personal injury and/or equipment damage
caused by improper fusing or circuit breaker selection, use only the
recommended line fuses/circuit breakers specified on
page 33 .
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 43 for details.