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What is basic difference between Soft Starters And VFD
drives?
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Answer Posted / mahmoud sawalhi
VFD : The drive consists primarily of two parts, one
which converts AC (50 or 60 Hz) to DC and the
second part which converts the DC back to AC,
but now with a variable frequency of 0-250 Hz.In many
applications a drive is still used for starting and
stopping the motor and for speed regulation
during a normal run .
softstarter: A softstarter has different characteristics
to the other starting methods ,It has thyristors in the
main circuit, and the motor voltage is regulated
with a printed circuit board ( but the frwquency cannot be
cotrolled like in VFD ).
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