Rockwell Automation 20Y PowerFlex Active Front End - Manual (Page 31)

Rockwell Automation Publication 20Y-UM001E-EN-P - July 2014 31
AFE in IP20 2500 MCC Style Enclosure—Installation/Wiring Chapter 1
Power Wiring Because most start-up difficulties are the result of incorrect wiring, take every
precaution to verify the wiring is correct. Read and understand all items in this
section before beginning installation.
Power Cable Types Acceptable for 400…690 Volt Installations
A variety of cable types are acceptable for PowerFlex Active Front End
installations. For many installations, unshielded cable is adequate, provided it can
be separated from sensitive circuits. As an approximate guide, use a spacing of 0.3
meters (1 ft) for every 10 meters (32.8 ft) of length. In all cases, avoid long
parallel runs. Do not use cable with an insulation thickness less than or equal to
15 mils (0.4mm/0.015 in.). Use only copper wire. Wire gauge requirements and
recommendations are based on 75 °C. Do not reduce wire gauge when using
higher temperature wire.
Unshielded Cable
THHN, THWN or similar wire is acceptable for PowerFlex Active Front End
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
cannot have large variations in insulation concentricity.
Shielded Cable
Shielded cable contains all of the general benefits of multi-conductor cable with
the added benefit of a copper braided shield that can contain much of the noise
generated by a typical AC drive. Strongly consider shielded cable in installations
with sensitive equipment such as weigh scales, capacitive proximity switches, and
other devices that can be affected by electrical noise in the distribution system.
Applications with large numbers of drives in a similar location, imposed EMC
regulations, or a high degree of communication and networking are also good
candidates for shielded cable.
ATTENTION: The following information is merely a guide for proper installation.
Rockwell Automation cannot assume responsibility for the compliance or
noncompliance to any code, national, local, or otherwise for the proper
installation of this unit or associated equipment. A risk of personal injury and/or
equipment damage exists if codes are ignored during installation.
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.