Danfoss VLT Pocket Manual page 17

Cabling: What is the maximum allowable cable,
distance between a soft starter and the motor?
The maximum distance between the soft starter and motor depends
on the voltage drop and the cable capacitance.
Cable must be selected so that when the motor is running fully loaded,
the voltage drop at the motor terminals does not exceed the limit
specifi ed in local electrical regulations.
For distances greater than 500 metres, cable capacitance may be a
factor. Contact Danfoss with details of the soft starter model, mains
voltage and frequency.
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VLT Soft Starter Pocket Guide 17