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
. 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
on page
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
on page
• 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
on page
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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Industry Automation
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