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Tool Talk Discussion Forum

Re: Electric Motor Starter

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NCWayne

01-30-2013 18:14:38
69.40.232.132



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A automotive switch isn't going to be able to handle the current required to start a motor like your wanting to do. That said the best way to do what your needing is to use two motor starters. The best way to explain it is this is that it's wired as a push to start/push to stop circuit. In other one starter is wired with an auxiliary contact so it pulls in and stays in when the start button is pushed. The other contact is wired to where it only pulls in when the start button is pushed. You should be able to do a search online to see how it's wored.

Doing it this way gives you a momentary switch (as long as the start button is pushed) that pulls in and engages the capacitor start, and the second starter that pulls in and holds to keep the motor running.

I wired a 10HP 3 Phase motor this way to use as a rotary phase converter and it works great. In my case the 3 phase motor needs the capacitors tied in on the third leg to get it started spinning, similar to the way a single phase, capacitor start motor needs the capacitor to get it spinning. Once spinning the capacitors are dropped out of the circuit, in most cases by a centrifugal switch, but in this case simply by releasing the start button and letting the starter wired for momentary operation open and drop it out.

Like I said I did mine awhile back and it works great so I don't see why it wouldn't work in your application also. The only drawback is the starters aren't usually cheap if you have to buy them new. I got lucky and got a few from the place my Dad works that came off pump controllers that they had removed from service. That said if you don't have the starters on hand try calling around to some places that do municiple type well and sewer equipment repair. If they are like where Dad is they pull at least one controller or two a week that has a good contactor in it but another bad part that keeps the whole thing from working properly.

Good luck...

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Dave Sherburne NY

01-30-2013 20:03:18
50.48.57.19



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 Re: Electric Motor Starter in reply to NCWayne, 01-30-2013 18:14:38  
Wayne, I don't know, but would one of those starter switches off an old Oliver tractor work????



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NCWayne

02-02-2013 22:44:09
69.40.232.132



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 Re: Electric Motor Starter in reply to Dave Sherburne NY, 01-30-2013 20:03:18  
I can't say 100% for sure wether it would work or not, because any switch that would handle the current flow would work, for awhile. The life expectancy would be determinded, I believe, mainly by the time it took for the contacts to burn out. I say this because an A/C motor stater is designed with the contacts being somewhat of a snap action to reduce the burning of the contacts as they open and close. If the contactor your talking about doesn't have that snap action the contacts will burn out fairly quick in relation to the right kind.

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