Installation/Wiring 1-3
If a system ground fault monitor (RCD) is to be used, only Type B
(adjustable) devices should be used to avoid nuisance tripping.
Unbalanced or Ungrounded Distribution Systems
If phase to ground voltage will exceed 125% of normal line to line
voltage or the supply system is ungrounded, refer to the Wiring and
Grounding Guidelines for 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 100kVA 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 using the information
supplied in Wiring and Grounding Guidelines for 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 in Appendix
A.
!
ATTENTION: PowerFlex 700 drives contain protective MOVs and
common mode capacitors that are referenced to ground. These devices
should be disconnected if the drive is installed on an ungrounded
distribution system. See page 1-13
for jumper locations.
To Next Page
Loading...
Need help?
General
