ABB ACS180, Руководство по оборудованию, Страница: 48 / 168

This table shows examples of methods for wiring the drive. Refer to NEC 70 along
with state and local codes for the appropriate methods for your application.
Notes Wiring method
Conduit - Metallic
1) 2)
Prefer symmetrical shielded VFD cable.
Electrical metallic tubing: Type EMT
Use separate conduit run for each motor. Rigid metal conduit: Type RMC
Do not run input power wiring and motor
wiring in the same conduit.
Liquid-tight flexible metal electrical conduit:
Type LFMC
Conduit - Non-metallic
2) 3)
Prefer symmetrical shielded VFD cable.
Liquid-tight flexible non-metallic conduit:
Type LFNC Use separate conduit run for each motor.
Do not run input power wiring and motor
wiring in the same conduit.
Wireways
2)
Prefer symmetrical shielded VFD cable.
Metallic
Separate motor wiring from input power
wiring and other low voltage wiring.
Do not run outputs of multiple drives parallel.
Bundle each cable (wiring) together and use
separators where possible.
Free air
2)
Prefer symmetrical shielded VFD cable.
Enclosures, air handlers, etc. Allowed internally in enclosures when in ac-
cordance with UL.
1) Metallic conduit may be used as an additional ground path, provided this path is a solid path capable
of handling ground currents.
2) See NFPA NEC 70, UL, and local codes for your application.
3) Non-metallic conduit use underground is allowed; however, these installations inherently have an
increased chance for nuisance problems due to the potential for water/moisture in the conduit.
Water/moisture in the conduit increases the likelihood of VFD faults or warnings. Proper installation
is required to make sure there is no intrusion of water/moisture.
Metal conduit
Couple separate parts of a metal conduit together: bridge the joints with a ground
conductor bonded to the conduit on each side of the joint. Also bond the conduits
to the drive enclosure and motor frame. Use separate conduits for input power,
motor, brake resistor, and control wiring. Do not run motor wiring from more than
one drive in the same conduit.
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Power cable shield
If the cable shield is used as the sole protective earth (PE) conductor, make sure
that its conductivity agrees with the PE conductor requirements.
To effectively suppress radiated and conducted radio-frequency emissions, the
cable shield conductivity must be at least 1/10 of the phase conductor conductivity.
The requirements are easily met with a copper or aluminum shield. The minimum
48 Guidelines for planning the electrical installation