Parallel Connection Of Motors - Danfoss VLT Micro Drive FC 51 Design Manual

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How to Install VLT Micro Drive FC 51 Design Guide

6.17 Parallel Connection of Motors

The frequency converter can control several parallel-
connected motors. The total current consumption of the
motors must not exceed the rated output current I for
INV
the frequency converter.
When motors are connected in parallel, 1-29 Automatic
Motor Tuning (AMT) cannot be used.
Problems may arise at start and at low RPM values if motor
sizes are widely different because small motors' relatively
high ohmic resistance in the stator calls for a higher
voltage at start and at low RPM values.
6 6
The electronic thermal relay () of the frequency converter
cannot be used as motor protection for the individual
motor of systems with parallel-connected motors. Provide
further motor protection by for example, thermistors in
each motor or individual thermal relays. (Circuit breakers
LC filter
are not suitable as protection).
Illustration 6.18
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