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Single phase 220 v motot starting

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Gene Davis

07-12-2003 20:05:02




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Motor went out on my old faithful Curtis compressor(after ?? years). Reached in to my collection and selected an old style(heavy frame) 1950's vintage American made,heavy built,1&1/2 h.p. 184 frame 1750,drip proof, single capacitor start motor. blew the dust off and out of it, checked the rotation and test ran it ,started and stopped it several times. Installed it and it started perfectly the first time, pumped up and cut off, then the next start-up attempt 10 minutes later when the pressure switch clicked on resulted in only a hum. took the belt off, no change,spun the motor pulley by hand and turned the current on and it still would only hum. No smoking or stinking. Would this be the starting capacitor, or what? Looks like there is a centrifugal switch or something like that inside the back housing of the motor. It was originally on a grain elevator on a farm bin. Haven't had much experience on this sort of thing. Any body know how to ohm out a capacitor, or whatever to test them, also what about the switch, or how to check the start windings? motor is rated for 9 amps was operating at 6-6.5 amps. Is that a pretty good average load for the motor? Would appreciate advice on this one. Thanks; Gene

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MarkB

07-13-2003 19:11:23




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 Re: Single phase 220 v motot starting in reply to Gene Davis , 07-12-2003 20:05:02  
My guess is the centrifugal switch stuck in the "run" position. Not too surprising, given that it hadn't run for a while. It's unlikely the capacitor would work the first time then suddenly fail.

Capacitors can't be properly checked without special equipment, but you can check to see if the capacitor is open or shorted. Disconnect the capacitor, then connect an ohmmeter across its terminals. The ohmmeter will momentarily read a short, then rise quickly to infinity (open circuit). Reverse the ohmeter leads and you'll see the same thing happen again, although the meter may actually show "negative" resistance for a moment.

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Dusty

07-13-2003 04:02:56




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 Re: Single phase 220 v motot starting in reply to Gene Davis , 07-12-2003 20:05:02  
It could also be the centrifugal switch. It cuts out (opens) the starting winding when the motor reaches a certain speed. If the switch doesn't close when the motor stops, the it will not start up the next time.

Good Luck,
Dusty



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ATW/WA

07-13-2003 02:16:17




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 Re: Single phase 220 v motot starting in reply to Gene Davis , 07-12-2003 20:05:02  
Gene, It sure sounds like a starting capacitor is the problem. You could get a relative test with an ohm meter, but nothing reliable. A new cap should be available at your local electrical motor repair shop for very little. You could check McMaster/Carr, or Graingers on the web for comparison shopping.

HTH ATW/WA



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