Rockwell Automation AK DBU - Dynamic Braking Unit 600/690 VAC - Manual (Page 16)

1-4 Installation/Wiring
Recommendations for the selection and wiring of power cables
• Cable must have copper conductors only
• Cable with 1,000V rating or greater is required
• Shielded cable is preferred
• For unshielded cable allow a spacing of 0.3 meters (1 foot) for every
10 meters (32.8 feet) of length. Long parallel runs must be avoided.
• Do not use cable with an insulation thickness less than or equal to
15 mils (0.4 mm/0.015 in.).
• See “Use of Unshielded Cable”
Use of Unshielded Cable
THHN, THWN or similar wire is acceptable for drive installation in dry
environments provided adequate free air space and/or conduit fill rates
limits are provided. Do not use THHN or similarly coated wire in wet
areas. Any wire chosen must have a minimum insulation thickness of
15 mils and should not have large variations in insulation concentricity.
EMC Compliance
Refer to Appendix B for details.
Cable Trays and Conduit
If cable trays or large conduits are to be used, refer to guidelines
presented in the PowerFlex 700 Reference Manual.
Connect DBU, fuses and brake resistors according to the block diagram
in
Figure P.1 . Refer also to General Installation and Wiring Guidelines
for CE Conformity on page B-1 .
Power Wiring
!
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.