Time Setting Between Star and Delta Starter..???

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mohsinhamid Commentator Join Date: May 2011 Posts: 91	Time Setting Between Star and Delta Starter..??? 10/05/2011 12:57 AM
	Pls any one say me the Time setting in the timer which is used to conver Stat to Delta starter in Motor..???? Do this time setting depends on rating of motor..???
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kvsridhar Guru Join Date: Sep 2009 Location: Temporarily at Ashburn, VA Posts: 2744 Good Answers: 164	#1 Re: Time setting between star and delta starter..??? 10/05/2011 1:33 AM
	This time depends on the inertia of the load (+motor)... higher the inertia, longer the acceleration time, longer the timer setting. Generally you should allow the motor to accelerate to 85% full speed before changing over to delta. It is also recommended that you provide a 'transition delay' of 30-100 milliseconds between star contactor drop-off and delta contactor pickup. You should also provide a mechanical interlock between star and delta contactors, in addition to the normal electrical interlock. For more info, check this out : http://cr4.globalspec.com/thread/48018 __________________ Nothing worthwhile can ever be taught, it can only be learnt.
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Tornado Guru Join Date: May 2009 Location: Richland, WA, USA Posts: 21017 Good Answers: 795	#2 Re: Time setting between star and delta starter..??? 10/05/2011 1:38 AM
	I would recommend a time delay of 5 seconds before blowing it up with dynamite, and replacing it with a better starting method. __________________ In vino veritas; in cervisia carmen; in aqua E. coli.
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JRaef Guru Join Date: Sep 2006 Location: California, USA, where the Godless live next door to God. Posts: 4665 Good Answers: 804	#3 In reply to #2 Re: Time setting between star and delta starter..??? 10/05/2011 12:26 PM
	<Like> __________________ All I every really wanted to be, was... A LUMBERJACK!.
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Aseer Commentator Join Date: Oct 2009 Location: Dubai,UAE Posts: 62 Good Answers: 2	#4 Re: Time Setting Between Star and Delta Starter..??? 10/06/2011 11:42 PM
	3 to 5 seconds.. __________________ There are no shortcuts on the road to a great experience.
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Aseer (1); JRaef (1); kvsridhar (1); Tornado (1)

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