40 | Danfoss Drives · DKDD.PB.551.A1.02
Soft starters are much more flexible than star/delta starters and
provide a smooth start with no risk of transients.
Star/delta starters cannot accommodate varying load conditions
(e.g. loaded or unloaded starts) and the start torque cannot be
adjusted to match motor and load characteristics. In addition,
the open transition between star and delta connection causes
damaging torque and current transients. Star/delta starters are not
capable of providing soft stop.
However, star/delta starters may be cheaper than a soft starter and
they may limit the start current to a lower level than a soft starter
when used on an extremely light load. However, severe current
and torque transients may still occur.
Star/Delta Starters: How does soft start compare
with star/delta starting?
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