Rockwell Automation 20D PowerFlex 700S Drive Ph I Control, Frames 1...11 - Manual (Page 20)

1-6 Installation/Wiring
Power Wiring Power Cable Types Acceptable for 200-600 Volt Installations
A variety of cable types are acceptable for drive installations. For many
installations, unshielded cable is adequate, provided it can be separated
from sensitive circuits. As an approximate guide, allow a spacing of 0.3
meters (1 foot) for every 10 meters (32.8 feet) of length. In all cases, long
parallel runs must be avoided. Do not use cable with an insulation thickness
less than or equal to 15 mils (0.4mm/0.015 in.). Use copper wire only. Wire
gauge requirements and recommendations are based on 75° C. Do not
reduce wire gauge when using higher temperature wire.
Unshielded
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.
Shielded/Armored 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. Strong consideration for shielded
cable should be given in installations with sensitive equipment such as
weigh scales, capacitive proximity switches and other devices that may 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 communications/networking are also good candidates for
shielded cable.
Shielded cable may also help reduce shaft voltage and induced bearing
currents for some applications. In addition, the increased impedance of
shielded cable may help extend the distance the motor can be located from
the drive without the addition of motor protective devices such as terminator
networks. Refer to Reflected Wave in Wiring and Grounding Guidelines for
PWM AC Drives, publication DRIVES-IN001.
Consideration should be given to all of the general specifications dictated by
the environment of the installation, including temperature, flexibility,
moisture characteristics and chemical resistance. In addition, a braided
shield should be included and specified by the cable manufacturer as having
coverage of at least 75%. An additional foil shield can be greatly improve
noise containment.
!
ATTENTION: National Codes and standards (NEC, BSI etc.)
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.