Rockwell Automation Publication 2099-UM001D-EN-P - December 2012
85
Connect the Kinetix 7000 Drive System
Chapter 4
Input Power Wiring
Requirements
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, branch circuit
protection and disconnect devices.
Acceptable Cable Types
Do not use cable with an insulation thickness less than or equal to 15 mils (0.4
mm/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.
As an approximate guide, provide 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.
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 and
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 that the motor can be located from the drive without the
addition of motor protective devices such as terminator networks.
Consideration should be given to 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 be specified by the cable manufacturer as having coverage of at least
75%. An additional foil shield can greatly improve noise containment.
ATTENTION:
To avoid personal injury and/or equipment damage, make sure
installation complies with specifications regarding wire types, conductor sizes,
branch circuit protection, and disconnect devices. The National Electrical Code
(NEC) and local codes outline provisions for safely installing electrical
equipment.
To avoid personal injury and/or equipment damage, make sure motor power
connectors are used for connection purposes only. Do not use them to turn the unit
on and off.
To avoid personal injury and/or equipment damage, make sure shielded power
cables are grounded to prevent potentially high voltages on the shield.
