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Commentator

Join Date: Dec 2006
Posts: 88

Comparison of Soft starters & Conventional motor starters

03/06/2008 11:02 PM

Dear Sir,

Could some one please explain me the Advantages & Disadvantages of having Soft starters instead of conventional auto transformer & star delta starter's?

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Guru
Philippines - Member - New Member Engineering Fields - Instrumentation Engineering - New Member Engineering Fields - Control Engineering - Who am I?

Join Date: Oct 2006
Location: Philippines
Posts: 2000
Good Answers: 49
#1

Re: Comparison of Soft starters & Conventional motor starters

03/07/2008 8:26 PM

You reduce your parts count. One soft-starter replaces three contactors (plus other peripheral devices).

Other advantages of using a soft-starter is the ability to choose the start up mode. Your soft-starter manual can explain those better than I can.

Then there's none of that annoying "THUD" as the contactors engage and disengage. I forget the number of times it made me jump while testing a 440V line.

In relation to that, the vibrations caused by contactors engaging and disengaging can accelerate loose connections in terminals. This is why we have "terminal tightening exercises" every few months or so.

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Associate

Join Date: Jan 2007
Posts: 35
#2

Re: Comparison of Soft starters & Conventional motor starters

03/07/2008 11:28 PM

In addition to reduction of components and noise during starting, the starting current will also get reduced when compared to DOL starting or Star/Delta starting.

R.Thiagarajan.

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