Installation/Wiring 1-9
Motor 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 15 mils (0.4 mm/0.015 in.). Do not route more than
three sets of motor leads in a single conduit to minimize “cross talk”. If
more than three drive/motor connections per conduit are required,
shielded cable must be used.
UL installations in 50°C ambient must use 600V, 75°C or 90°C wire.
UL installations in 40°C ambient should use 600V, 75°C or 90°C wire.
Use copper wire only. Wire gauge requirements and recommendations
are based on 75 degree 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.
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, branch circuit protection 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” power leads.
To Next Page
Loading...
