NORD Drivesystems MI0700 - Manual (Page 42)

Frequency inverters – Migration Guide SK 700E to SK 5xxE
42 MI 0700 GB-0414
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2.7 Chokes
Chokes are inductive, passive components used for current limitation, interference suppression and
damping of undesired harmonic content.
There are two types of chokes: input and output chokes.
Choke type
• Input choke (mains choke)
• Output choke (motor choke)
Input choke Output chokes
Figure 7: Choke types
Both choke types are available for the entire power ranges of the SK 700E and also the SK 5xxE
frequency inverters from 1.5 kW to 160.0 kW.
To reduce harmful mains voltage peaks or mains voltage fluctuations, adaptive input chokes of type
SK CI1-4x0/xxx-C can be connected upstream of the frequency inverter if required by the system.
The use of input chokes considerably reduces external mains feedback effects and the proportion of
current harmonics to a minimum.
To improve the EMC characteristics and for safety reasons, output chokes of type SK CO1-4x0/xxx-
C are often implemented between frequency inverter and the motor in case of long motor cables. They
reduce the electromagnetic radiation emitted by the motor cable or provide cable compensation in
case of long motor cables. For more details regarding the allocation of the respective input and output
chokes, refer to the following sub-chapters.
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