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When is it recommended to use a line choke for an ATV71 ?

The use of line chokes is recommended in particular under the following circumstances:
1-Close connection of several drives in parallel
Line supply with significant disturbance from other equipment (interference,
overvoltages)
2-Line supply with voltage imbalance between phases that is more than 1.8% of the
nominal voltage
3-Drive supplied by a line with very low impedance (in the vicinity of power
transformers 10 times more powerful than the drive rating)
4-Installation of a large number of frequency inverters on the same line
Reduction of overloads on the cos ϕ correction capacitors, if the installation
includes a power factor correction unit
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