Rockwell Automation 20G PowerFlex SCR Bus Supply - Manual (Page 21)

Installation/Wiring 1-7
PowerFlex SCR Bus Supply User Manual
Publication 20S-UM001G-EN-P
Fusing The 400A and 600A PowerFlex SCR Bus Supplies have built-in AC line
and DC bus fuses. The 1000A unit has six in-path fuses which
simultaneously protect AC and DC paths. All units are equipped with fuse
trip indicator switches. For a list of recommended replacement fuses, refer
to these pages.
Power Wiring
To maintain balanced impedance, and thus balance current in the SCR Bus
Supply, it is recommended to keep all wired or bus bar connections identical
in size and length. This includes the AC line connection to three-phase AC
line reactors and from the three-phase AC line reactors to the SCR Bus
Supply.
EMC Compliance
Refer to CE Conformity on page 1-19 for details.
Cable Trays and Conduit
If cable trays or large conduits are to be used, refer to guidelines in the
Wiring and Grounding Guidelines for Pulse Width Modulated (PWM) AC
Drives (publication DRIVES-IN001).
DC Bus Wiring Guidelines
For DC Bus wiring guidelines, refer to AC Drives in Common Bus
Configurations (publication DRIVES-AT002).
SCR Bus Supply See Page…
400A A-15
600A A-17
1000A A-19
!
ATTENTION: National Codes and standards (NEC, VDE, BSI,
etc.) and local codes outline provisions for safely installing
electrical equipment. Installation must comply with specifications
regarding wire types, conductor sizes, and disconnect devices.
Failure to do so may result in personal injury and/or equipment
damage.
!
ATTENTION: To avoid a possible shock hazard caused by
induced voltages, unused wires in the conduit must be grounded at
both ends. For the same reason, if a drive sharing a conduit is being
serviced or installed, all drives using this conduit should be
disabled. This will help minimize the possible shock hazard from
“cross coupled” motor leads.