Installation/Wiring 1-3
PowerFlex 70 drives are suitable for use on a circuit capable of
delivering up to a maximum of 200,000 rms symmetrical amperes, and a
maximum of 600 volts.
If a system ground fault monitor (RCD) is to be used, only Type B
(adjustable) devices should be used to avoid nuisance tripping.
Unbalanced, Ungrounded or Resistive Grounded 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 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
AC Supply Source Considerations
!
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 70 drives contain protective MOVs and
common mode capacitors that are referenced to ground. These devices
must be disconnected if the drive is installed on a resistive grounded
distribution system or an grounded distribution system. See page 1-11
for jumper locations.
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