Air Compressure Coil

3 comments

Rate

khlgupta1972 Member Join Date: Oct 2013 Posts: 5	Air Compressure Coil 02/13/2015 6:08 AM
	Hello, my air compressor,motor is stat in star delta startor. Delta Contactor coil burnt with in one hour this problem is repeating three times. Motor of the compressor is 90kw & contactor is using 3TH50 Siemens make & coil voltage 220VAC. So please suggest that how to protect contactor coil.
	Register to Reply

Interested in this topic? By joining CR4 you can "subscribe" to
this discussion and receive notification when new comments are added.

Check out these comments that don't yet have enough votes to be "official" good answers and, if you agree with them, vote them!

RAMConsult Guru Join Date: May 2007 Location: NYC metropolitan area. Posts: 3230 Good Answers: 444	#1 Re: Air Compressure Coil 02/13/2015 7:41 AM
	Best way is to find out why the coil is burning out before you burn out yet another one. Check the voltage and current, unless you are using inferior contactors coils just don't burn out for no reason, find out what it is. __________________ “Tell me and I forget. Teach me and I remember. Involve me and I learn.” Ben Franklin.
	Register to Reply Score 1 for Good Answer

Ali18 Power-User Join Date: May 2008 Posts: 136 Good Answers: 2	#2 Re: Air Compressure Coil 02/13/2015 8:35 AM
	According to your description,.. I think there's some undervoltage in the source feeding the contactor's coil in question, which will -in turn - result in overcurrent in the coil(definitely, it'll burn out over time). Also, this can happen because of the accumulation of dust all over the contacts and terminals of the contactor, so clean it inside out. I hope this helps. __________________ Just live and .. Learn!!
	Register to Reply Off Topic (Score 3)

raghun Power-User Join Date: Jan 2010 Location: Hyderabad Posts: 343 Good Answers: 22	#3 Re: Air Compressure Coil 02/14/2015 9:04 AM
	Apparently, the delta contactor coil is getting higher voltage than rated (220V), it could be 400V (Ph-ph voltage instead of ph-E voltage??). Please check the circuit and it should be clear. On second thought, if the LV system is rated 415V, the corresponding phase to earth voltage will be 240V and assuming that the upstream source transformer is not loaded fully, the actual 415V bus voltage is likely to be ~430V which means the Ph-E voltage of ~250V. If the delta contactor coil is rated 220V and not 240V, can this over voltage be the reason for the coil burnout?? __________________ Raghunath
	Register to Reply

Check out these comments that don't yet have enough votes to be "official" good answers and, if you agree with them, vote them!

Copy to Clipboard

Ali18 (1); raghun (1); RAMConsult (1)

	Got Something to Say?
	Ask a Question Start a Discussion

	Aerospace
	BioMech & BioMed
	Chemical & Material Science
	Civil Engineering
	Communications & Electronics
	Education and Engineering Careers
	Electrical Engineering
	General Discussion
	Instrumentation
	Manufacturing
	Mechanical Engineering
	New Technologies & Research
	Software & Programming
	Sustainable Engineering
	Transportation

	Site Directories
	Forum Directory Blog Directory User Group Directory RSS Feeds CR4 Rules of Conduct CR4 FAQ Site Glossary Who's Online (158 right now) Show Members