Rockwell Automation Publication 750-IN118A-EN-P - May 2021 93
Chapter 4
Power Wiring
This section covers grounding of the entire bay lineup, the connections to the
customer AC supply source, and the connections to the motor. All electrical
connections between the bays must be performed before making the
connections in this chapter. For electrical connections between the bays, see
Make Bay-to-Bay Electrical Connections on page 60
.
Most startup difficulties are the result of incorrect wiring. Every precaution
must be taken to make sure that the wiring is done as instructed. All items
must be read and understood before the actual installation begins.
AC Supply Source
Considerations
PowerFlex® 755T Drives Configured to Order Program products are suitable
for use on a circuit capable of delivering the following:
• up to a maximum of 100,000 rms symmetrical amperes at 400/480V
• up to a maximum of 65,000 rms symmetrical amperes at 600/690V
PowerFlex 755T Drives Configured to Order Program products must not be
used on undersized or high-impedance supply systems. The supply system kVA
must be equal to or greater than the product-related kW, and the system
impedance must be less than 10%. Operation outside these limits can cause
instability and product shutdown.
System Impedance = (PowerFlex 755T kVA ÷ Transformer kVA) x Transformer % Impedance
You must account for the kVA of all PowerFlex 755T Drives Configured to
Order Program products 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.
ATTENTION: The following information is merely a guide for proper
installation. Rockwell Automation, Inc. cannot 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 on
page 102 and Input Power Circuit Breakers on page 105.
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