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Rockwell Automation Publication 20Y-UM001F-EN-P - April 2017
Chapter 1
AFE in IP20 2500 MCC Style Enclosure – Installation/Wiring
and recommendations are based on 7 5°C (167 °F). 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 rate limits are provided.
Do not use THHN or similarly coated
wire in wet areas
. Any wire that is chosen must have a minimum insulation
thickness of 15 mils and cannot have large variations in insulation
concentricity.
Shielded Cable
Shielded cable contains the general benefits of multi-conductor cable with the
added benefit of a copper braided shield. The shield can contain much of the
noise that is generated by a typical AC drive. Shielded cable is recommended in
installations with sensitive equipment such as weigh scales, capacitive
proximity switches, and other devices 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.
Consider the general specifications that are dictated by the environment of the
installation, including temperature, flexibility, moisture characteristics, and
chemical resistance. Also, include a braided shield that is specified by the
manufacturer as having coverage of at least 75%. An additional foil shield can
improve noise containment.
A good example of recommended cable is Belden 29528 - 29532 (AWG-1
through AWG-410). This cable has three XLPE insulated conductors plus
ground with a spiral copper shield that is surrounded by a PVC jacket.
Armored Cable
Cable with continuous aluminum armor is often recommended in drive system
applications or specific industries. It offers most of the advantages of standard
shielded cable and also combines considerable mechanical strength and
resistance to moisture. It can be installed in concealed and exposed manners,
and removes the requirement for conduit (EMT) in the installation. It can also
be directly buried or embedded in concrete.
Because noise containment is affected by incidental grounding of the armor to
building steel when the cable is mounted, we recommend that the armored
cable has an overall PVC jacket. See Chapter 2, ‘Wire Types’ in Wiring and
Summary of Contents for Allen-Bradley PowerFlex 700AFE
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