36 Planning the electrical installation
European union
To meet the European Union Directives, according to standard EN 60204-1, Safety of
Machinery, the disconnecting device must be one of the following types:
• a switch-disconnector of utilization category AC-23B (EN 60947-3)
• a disconnector having an auxiliary contact that in all cases causes switching
devices to break the load circuit before the opening of the main contacts of the
disconnector (EN 60947-3)
• a circuit breaker suitable for isolation in accordance with EN 60947-2.
Other regions
The disconnecting device must conform to the applicable safety regulations.
Checking the compatibility of the motor and drive
Check that the 3-phase AC induction motor and the drive are compatible according to
the rating table in section Ratings on page 336. The table lists the typical motor power
for each drive type.
Selecting the power cables
General rules
Dimension the input power and motor cables according to local regulations.
• The input power and the motor cables must be able to carry the corresponding
load currents. See section Ratings on page 336 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 38.
• The conductivity of the PE conductor must be equal to that of the phase
conductor (same cross-sectional area).
• 600 V AC cable is accepted for up to 500 V AC.
• Refer to chapter Technical data on page 335 for the EMC requirements.
A symmetrical shielded motor cable (see the following figure) 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.
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