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Tractor Talk Discussion Forum

Elect. Motor hook-up

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37 chief

08-01-2006 13:48:27




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If I want to hook up a motor contactor to my compressor which is 220v single ph. The contactor coil voltage is also 220v. Can I hook up a jumper from my line voltage to each side of the coil? and put the manual start switch across this jumper, and the pressure switch also Thanks fpr any help. Stan




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John M

08-01-2006 16:53:34




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 Re: Elect. Motor hook-up in reply to 37 chief, 08-01-2006 13:48:27  
Im no electrical engineer by no means, but I think the way mine is has the main cutoff on the supply, and the pressure switch is on the coil.Sorry, too much junk in the way to go look.



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John T

08-01-2006 17:10:19




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 Re: Elect. Motor hook-up in reply to John M, 08-01-2006 16:53:34  
In the typical Motor Starter the low current "coil" could be fed from one leg of the 240 line voltage and then in series with maybe a pressure switch and the push to start hold in contactor and the thermal cutouts and then over to the other phase leg to complete the loop. Once the push to start switch activated the hold in relay in paralell with it and provided the pressure switch was closed and none of the thermals were opened, she would engage the power contactors. It would be easier if I were smart enough to include a wiring diagram, I will look n see if I have one.

Basically yes you use the line voltage to power the activation coil buttttt ttttt theres the pressure switch and the thermal overloads and the push to start switch and its paralell contactor alllll l in series between the phase conductors in the low current coil activation circuit.

John T

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