Rockwell Automation Publication 750-IN119A-EN-P - April 2022 59
Chapter 5
Power Wiring
Most startup difficulties are the result of incorrect wiring. Every precaution
must be taken to help ensure that the wiring is done as instructed. All items
must be read and understood before the actual installation begins.
AC Supply Source
Considerations
PowerFlex® 755TS drives are suitable for use on a circuit capable of delivering
up to a maximum of 100,000 rms symmetrical amperes at 400/480V.
You must account for the kVA of all PowerFlex 755TS drives on the distribution
system and the system impedance of upstream transformers.
If a Residual Current Detector (RCD) is used as a ground fault monitor, use
only Type B (adjustable) devices to avoid nuisance tripping.
Motor Considerations Due to the operational characteristics of AC variable frequency drives, motors
with inverter grade insulation systems that are designed to meet or exceed
NEMA MG1 Part 31.40.4.2 standards for resistance to spikes of 1600 volts are
recommended.
Guidelines must be followed when using non-inverter grade motors to avoid
premature motor failures. See Wiring and Grounding Guidelines for Pulse
Width Modulated (PWM) AC Drives, publication DRIVES-IN001
for
recommendations.
ATTENTION: The following information is merely a guide for proper
installation. Rockwell Automation, Inc. can’t assume responsibility for the
compliance or the noncompliance to any code, national, local or otherwise for
the proper installation of this drive or associated equipment. A hazard of
personal injury and/or equipment damage exists if codes are ignored during
installation.
ATTENTION: To guard against personal injury and/or equipment damage that
is caused by improper fusing or circuit breaker selection, use only the
recommended line fuses/circuit breakers that are specified in the Fuses and
Circuit Breakers section on page 71
.
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