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Planning the electrical installation
63
Alternative power cable types
Power cable types that can be used with the drive are represented below.
Motor cable shield
To effectively suppress radiated and conducted radio-frequency emissions, the
shield conductivity must be at least 1/10 of the phase conductor conductivity. The
requirements are easily met with a copper or aluminium shield. The minimum
requirement of the motor cable shield of the drive is shown below. It consists of a
concentric layer of copper wires with an open helix of copper tape. The better and
tighter the shield, the lower the emission level and the bearing currents.
Additional US requirements
Type MC continuous corrugated aluminum armor cable with symmetrical grounds or
shielded power cable must be used for the motor cables if metallic conduit is not
used. For the North American market, 600 VAC cable is accepted for up to 500 VAC.
1000 VAC cable is required above 500 VAC (below 600 VAC). For drives rated over
100 amperes, the power cables must be rated for 75
°
C (167
°
F).
Symmetrical shielded cable: three phase conductors
and a concentric or otherwise symmetrically
constructed PE conductor, and a shield
Recommended
PE conductor
and shield
Shield
Shield
A separate PE conductor is required if the conductivity
of the cable shield is < 50 % of the conductivity of the
phase conductor.
A four-conductor system:
three phase conductors
and a protective
conductor.
Shield
PE
PE
PE
Not allowed for motor cables
with phase
conductor cross section larger than 10 mm
2
(motors > 30 kW).
Not allowed for motor cables
Insulation jacket
Copper wire screen
Helix of copper tape
Cable core
Inner insulation
Phone: 800.894.0412 - Fax: 888.723.4773 - Web: www.clrwtr.com - Email: [email protected]
Содержание ACS800-07-0610-3
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Страница 144: ...Dimensions 138 Frame size 1 D4 2 R8i Phone 800 894 0412 Fax 888 723 4773 Web www clrwtr com Email info clrwtr com ...
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