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Old 10-07-2015, 07:46 PM   #4441
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I'm going to talk to my landlord. He expressed interest in the compressor when he picked it up and moved it to my new house. Maybe I can trade for one of his smaller ones.
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Old 10-07-2015, 07:59 PM   #4442
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Its says right on the name plate "full load amps-22" Being a compressor, it shouldn't be running at full load all the time. Plug the bitch in and turn it on. If it makes it past inrush, youll be fine IMO.

Do you not have a clamp on ammeter?
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Old 10-07-2015, 08:01 PM   #4443
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False. It says FL Amps. Now to some measly electrical engineer like me that means nothing .

Plug the bitch in was #1 on my list. I need to rewire the plug though.

Deezums talked about blowing caps though.
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Old 10-07-2015, 08:04 PM   #4444
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Definitely possible, thats why you check the voltage while its running. If it falls under nominal, then youll stress the caps out for sure.
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Old 10-07-2015, 08:06 PM   #4445
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Dont get me wrong, youll be dam close to using all 20 amps on that circuit. But I doubt it runs at FLA all the time.
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Old 10-07-2015, 08:08 PM   #4446
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Ok. So I need to buy a clamp on ampmeter on the way home. Then plug the bitch in and measure? What is below nominal?
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Old 10-07-2015, 08:09 PM   #4447
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You have a voltmeter? Just check the voltage is in spec at all times while it's working. The clamp would be valuable if you don't trust the breaker.

The compressor I was dealing with would drop under 200v occasionally, which apparently is bad on the start capacitor. It would randomly pop the breaker, start and run fine, or sound like a box of rocks failing to turn over before eventually popping the breaker.

The windings on the same motor blew up, possibly from running full current through it while it wasn't moving. It sounded the same as failed start capacitors when it finally died, except a new capacitor didn't work then.

Either it was a **** motor to begin with, the first failing capacitor damaged the windings, or it was the low starting voltage. I don't know, but I blame the voltage for part of it.

Regardless, there's an expensive motor on larger breaker now. It works, though the compressor is falling apart around it lol
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Old 10-07-2015, 08:10 PM   #4448
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I have a little volt meter. Guess I can open up the panel and measure. 2 110v lines right? Or do they merge into one 220v line. I'll take pictures when I'm home.
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Old 10-07-2015, 08:12 PM   #4449
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Quote:
Originally Posted by deezums View Post
Yeah, that should work. I don't know if I'd trust a harbor freight electric motor though.

Check your Craigslist. Old dudes stash these things.

Then again, there might be less farm equipment near you...
The two good HF compressors, the oiled compressor ones, have made in italy pumps, made in the USA tanks, and typically Baldor motors. But the motor brand seems to change occasionally. This is why the HF 60gal compressor costs twice as much as the Husky and Kobalt branded ones, and even more than the cheapest IR one.
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Old 10-07-2015, 08:15 PM   #4450
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I think 10% below nominal is max acceptable, so that would be 207 VAC. You dont need a clamp on ammeter, just surprised you dont have one. If its drawing to much current, you will measure that as a voltage drop with you multimeter.

I thought under voltage is hard on the run capacitor? Power factor and whatnot.
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Old 10-07-2015, 08:19 PM   #4451
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Quote:
Originally Posted by aidandj View Post
I have a little volt meter. Guess I can open up the panel and measure. 2 110v lines right? Or do they merge into one 220v line. I'll take pictures when I'm home.
its a 2 phase circuit


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Old 10-07-2015, 08:20 PM   #4452
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Thank you
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Old 10-07-2015, 08:20 PM   #4453
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Quote:
Originally Posted by hi_im_sean View Post
its a 2 phase circuit


Nope, thats single phase. No such thing as 2 phase, only single phase and 3 phase.
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Old 10-07-2015, 08:21 PM   #4454
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Nope, thats single phase. No such thing as 2 phase, only single phase and 3 phase.
confused, are they not 2 waves 90 degrees out of phase?
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Old 10-07-2015, 08:22 PM   #4455
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They are on the same phase I think. Its really just 2 110 lines run from 2 110 breakers. I think.
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Old 10-07-2015, 08:23 PM   #4456
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No, they are 2 waves, in phase but with opposite polarity. Basically one leg is +110 and the other is -110 so delta V across the plugs is 220.
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Old 10-07-2015, 08:23 PM   #4457
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My bad, thanks for the clarification. Ive always called that 2 phase lol
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Old 10-07-2015, 08:25 PM   #4458
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I made the same mistake.
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Old 10-07-2015, 08:27 PM   #4459
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Quote:
Originally Posted by hi_im_sean View Post
I think 10% below nominal is max acceptable, so that would be 207 VAC. You dont need a clamp on ammeter, just surprised you dont have one. If its drawing to much current, you will measure that as a voltage drop with you multimeter.

I thought under voltage is hard on the run capacitor? Power factor and whatnot.
It wouldn't drop under spec if it would pass inrush, so I guess that's why it tanked the start capacitor and not the run.

I did not know that about the harbor freight compressors, if I ever need a bigger one I'll have to remember that.

Three taps for residential, all off the same transformer. Two hots and the neutral.

Three phase comes with three transformers, all of their own.

Residential alternates the phase your neighbors transformers tap from, for balancing. Your breaker panel alternates poles of the single transformer, and occasionally taps two for 220V. Each line sees half the amperage, so a 20A double is two 10A singles.
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Old 10-07-2015, 08:28 PM   #4460
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