2 Migration
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2.9.3.2 Motor chokes
In case of long motor cables, motor chokes are installed between the frequency inverter and the motor
for improving the EMC characteristics and the device protection. They reduce the motor cable’s
interference signals, or the cable compensation in case of longer motor cables.
In the following tables, the different motor chokes are assigned to the individual power ranges of both
device series and compared to them.
SK CO1-xxx/xxx-C for SK 5xxE SK CO5-xxx/xxx-C for SK 5xxP
Illustration 13: NORDAC PRO motor chokes
The SK CO1-… motor chokes are specified for a maximum supply voltage of 460 V at 50/60 Hz. The
SK CO5-… motor chokes are specified for a maximum supply voltage of 500 V at 50/60 Hz.
Both types of motor chokes are UL certified and should always be installed in the control cabinet due
to their IP00 protection class version. The motor chokes are connected using screw terminals.
All available motor chokes are only rated for a pulse frequency of 3 to 6 KHz and an output frequency
of 0 to 120
Hz. The parameterisation is done under the additional parameters in the frequency
inverter.
For detailed information, please refer to the technical information Chapter 5.1.2 "Technical
information/Data sheets"and the 5.1.1 "Manuals"manuals.
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