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1-8
Installation/Wiring
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 that 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-IN001A-EN-P.
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 be specified by the cable
manufacturer as having coverage of at least 75%. An additional foil
shield can greatly improve noise containment.
A good example of recommended cable is Belden® 295xx (xx
determines gauge). This cable has four (4) XLPE insulated conductors
with a 100% coverage foil and an 85% coverage copper braided shield
(with drain wire) surrounded by a PVC jacket.
Other types of shielded cable are available, but the selection of these
types may limit the allowable cable length. Particularly, some of the
newer cables twist 4 conductors of THHN wire and wrap them tightly
with a foil shield. This construction can greatly increase the cable
charging current required and reduce the overall drive performance.
Unless specified in the individual distance tables as tested with the drive,
these cables are not recommended and their performance against the lead
length limits supplied is not known.
Содержание 9VT201-007HTNNN
Страница 1: ...VTAC 9 AC Drive Firmware Version 3 xx User Manual ...
Страница 4: ...soc 2 ...
Страница 14: ...P 8 Overview Publication 9VT UM001D EN P Notes ...
Страница 56: ...1 42 Installation Wiring Publication 9VT UM001D EN P Notes ...
Страница 62: ...2 6 Start Up Publication 9VT UM001D EN P Notes ...
Страница 130: ...3 68 Programming and Parameters Publication 9VT UM001D EN P Notes ...
Страница 150: ...4 20 Troubleshooting Publication 9VT UM001D EN P Notes ...
Страница 176: ...A 26 Supplemental Drive Information Publication 9VT UM001D EN P Notes ...
Страница 196: ...B 20 Using the LCD OIM Publication 9VT UM001D EN P Notes ...
Страница 212: ...C 16 Application Notes Publication 9VT UM001D EN P Notes ...
Страница 223: ......