Planning electrical installation
26
Selecting the power cables
General rules
Dimension the input power and motor cables according to local regulations.
• The cable must be able to carry the drive load current. See chapter Technical
data for the rated currents.
• The cable must be rated for at least 70
°C maximum permissible temperature of
the conductor in continuous use. For US, see section Additional US requirements
on page 27.
• The conductivity of the PE conductor must be equal to that of the phase
conductor (same cross-sectional area).
• 600 VAC cable is accepted for up to 500 VAC.
• Refer to chapter Technical data for the EMC requirements.
A symmetrical shielded motor cable (see the figure below) must be used to meet the
EMC requirements of the CE and C-tick marks.
A four-conductor system is allowed for input cabling, but a shielded symmetrical
cable is recommended.
Compared to a four-conductor system, the use of a symmetrical shielded cable
reduces electromagnetic emission of the whole drive system as well as motor
bearing currents and wear.
Alternative power cable types
Power cable types that can be used with the drive are presented below.
Symmetrical shielded cable: three phase conductors,
a concentric or otherwise symmetrically constructed
PE conductor and a shield
Motor cables
(recommended for input cables also)
PE conductor
and shield
Shield
Shield
PE
PE
Allowed as input cables
A four-conductor system: three phase conductors and
a protective conductor
Note: A separate PE conductor is required if the
conductivity of the cable shield is not sufficient for the
purpose.
Shield
PEPE
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