Rockwell Automation Publication 750-RM003A-EN-P - April 2018 29
Selection Considerations Chapter 1
AC Power Cables
The PowerFlex 700AFE IP20/IP21 enclosed DC bus supply used various AC
power connection methods. If you intend to reuse any of the existing AC
power cables, review the installation and verify that the cables, lugs, and cable
ratings meet the requirements of the new PowerFlex 755TM bus supply.
The PowerFlex 755TM IP21/IP54 enclosed bus supplies are connected to the
required AC power source with two-hole, UL-listed, crimp barrel lugs that are
bolted to the internal AC bus bars or bus stubs.
We recommend this cable construction:
• Three tinned copper conductors with XLPE insulation and three bare
copper ground conductors.
• Minimum insulation rating 600V, 75 °C (167 °F)
• Maximum 500 MCM copper conductors, multiple parallel conductors
may be required per phase.
• Shielded cable with continuous aluminum armor, copper braid/
aluminum foil combination shield, and tinned copper drain wire, three
drain wires per cable assembly, although not necessary, is recommended
and may be required to meet some EMC standards for CE, C-Tick, or
FCC.
• Armored cable with PVC jacket.
Other Power Circuit Considerations
If your application requires the use of AC input contactors or other power
circuit devices, see the appropriate sections of the PowerFlex 750-Series
Products with TotalFORCE Control installation manual, publication 750-
IN100. Confirm that interrupting the AC input circuits of the new bus supply
is handled correctly to prevent malfunctions, damage, or operational issues
with the equipment.
ATTENTION: National Codes and standards (NEC, VDE, CSA, BSI, and so
forth) and local codes outline provisions for safely installing electrical
equipment. Installation must comply with specifications regarding wire
types, conductor sizes, branch circuit protection, and disconnect devices.
Failure to do so may result in personal injury and/or equipment damage.
IMPORTANT Refer to Wiring and Grounding Guidelines for Pulse-width Modulated
(PWM) AC Drives, publication DRIVES-IN001
, for detailed installation
planning guidelines.
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