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Hey Joe Evans!

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Vinnie

02-27-2001 13:32:29




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I am looking at a Craftsman air compressor. The tool book just says it an 80 gallon-vertical tank and has max HP at 7. The other compressors in the book list if it is 120 or 240 etc. This unit does not list voltage-it just says to contact your local power company before ordering. The Sears 888 toll free number guy knows no ore than what s in the book. The power company said some areas have 120-208 instead of 120-240. What do you think is likely here. I'm 120-240 Will this compressor work at in my shop? It has a gray metal box that the motor sits on. HELP?

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Joe Evans

02-27-2001 21:45:27




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 Re: Hey Joe Evans! in reply to Vinnie, 02-27-2001 13:32:29  
Hopefully someone else will see your post and help me out here, but I would say that the likelihood of you having a 120v-208v motor on the compressor is nil. It is probably 120-240v. I've never heard of residential service as being 120v-208V, but then again, I haven't been around much. That really seems rather odd to me. As I write this, though, I do remember an odd problem we had at our shop years ago before we updated the service. There was a 3 phase service coming into our shop where two pairs of legs would yield 120V single phase power between each pair, and one pair was 190V. An electrician mistakenly connected standard lighting to this leg (he assumed 120V) and blew flourescent fixture ballasts all over the place. This arrangement, he said (embarrassed),is a throw-back to some old "open-Y" transformer arrangement that I about half understand. So maybe voltages in the neighborhood of 208 still exist out there for residential drops. Anyway, I don't know about the effects of running a 208V AC motor on 240V. However, what generally fails first is the control coil in the motor starter as these are mostly 120V. Then again, this won't be a problem if the compressor doesn't have starter. Someone else will have to help here. I do know about running motors on low voltage--it ain't pretty.

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VaTom

02-28-2001 10:02:45




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 Re: Re: Hey Joe Evans! in reply to Joe Evans, 02-27-2001 21:45:27  
This all is real interesting to me. I've run phase convertors for years. Recently I found a guy who had fried several cash registers by his "electrician" hooking to the wrong legs on a 3 phase generator. He KNEW the generator was a problem and I got it for a song. Now generate my own 3 phase and use it for back up for the house. All it takes is a ten buck voltmeter, and a small amount of thought, to tell the difference. If Sparky's offering a class, I'll enroll. Far as I know, you read the motor label, check your available voltage, if there's a match, it'll work. Buying something without reading the motor label sure doesn't sound good. I've tried 208v. motors on 240v. But not for long... For the controls, current's the main issue.

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Old Sparky

02-28-2001 05:09:59




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 Re: Re: Hey Joe Evans! in reply to Joe Evans, 02-27-2001 21:45:27  
The systems 480Y/277 and 208Y/120 are Y or "star" 3 phase systems. A very large individual dwelling or an apartment building might have 208Y/120. The 208Y/120 system will deliver 208 3-phase, 208 single phase and 120 single phase. Phase balance is usually not critical for these systems as they are used for loads that are mostly single phase. 480Y/277 works the same way. The "electrician" Joe mentioned hooked to the "high leg" of a Delta 3-phase system. Delta systems will supply only limited loads of low voltage. For example, Delta 230 volts with one transformer winding center tapped will supply 230 3-phase, 230 single phase, and limited amounts of 115 volts. Obviously too much to explain in one of these posts. Perhaps this shows why Old Sparky gets upset and suggests more training for some of those asking questions. It is because your life insurance company asked me to help keep you alive a bit longer.

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Joe Evans

02-28-2001 21:21:20




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 Re: Re: Re: Hey Joe Evans! in reply to Old Sparky, 02-28-2001 05:09:59  
Thanks for the info!



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T_Bone

02-28-2001 05:05:31




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 Re: Re: Hey Joe Evans! in reply to Joe Evans, 02-27-2001 21:45:27  
Hi Joe, In arizona they have 3ph running to residential without a load disconnect. This arrangement was for AC when it first came out. I never liked working on hot systems! You can find anything installed in the field for power voltage. Most have been updated to the current 115vac/230vac standard but one must never assume anything with electricity as when they do there dead. Running a 208vac on 230vac will shorten the life of the motor although not as bad as running a 230vac on 208vac. This also will effect compressor control and "every" compressor has controls. The correct way, is to install a motor rated for the current supply voltage.

T_Bone

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samcoinc

02-28-2001 04:58:12




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 Re: Re: Hey Joe Evans! in reply to Joe Evans, 02-27-2001 21:45:27  
our shop has the "wild leg" three phase service that you talk about and it was only put in about 10 years ago. scary.

sam



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