Rockwell Automation 7000L PowerFlex Medium Voltage AC Drive (C Frame) - Classic Control - Manual (Page 108)

2-72 Drive Installation
7000L-UM300I-EN-P – June 2013 7000 “C” Frame
Power Wiring Selection
Note:
(cont.)
• The transformer secondary cables should be sized to the full
current rating of the transformer in all cases including 18-pulse
transformer applications.
• For 18-pulse transformers, while each secondary is one third of
the kVA rating of the unit, the voltage is also one third of the
primary voltage, resulting in the same current requirement on the
secondary as the primary.
The wire sizes must be selected individually, observing all applicable
safety and CEC or IEC / NEC regulations. The minimum permissible
wire size does not necessarily result in the best operating economy.
The minimum recommended size for the wires between the drive and
the motor is the same as that used if a main voltage source
connection to the motor was used. The distance between the drive
and motor may affect the size of the conductors used.
Consult the wiring diagrams and appropriate CEC or IEC / NEC
regulations to determine correct power wiring. If assistance is
needed, contact your local Rockwell Automation Sales Office.