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capacitor weak --motor drawing to many amps if using extension cord[s] not correct or to far from source and causing to much voltage drop -motor faling--compressor failing
the start capacitor on the motor body is weak,the motor needs this component to over come the air pressure when cycling to re-build the low air pressure,change both the start and run capacitors when doing the start because the other run capacitor is just as old and it will soon fail
Sounds like the unit is pulling to many amps during start up. Possibilities are: breaker under sized, wire under sized, to long of a run of wire from breaker for wire size,Tank check valve bad. I would check the amps during start up and while running and compare to motor name plate information. Remember at start up the motor may pull 1.5 to 2 times the rated amps on the name plate. Also if this unit has a magnetic starter wire connections may be loose or overloads to small.
I am not a master electrician but I was an apprentice for 5 years and think you should be ok with a 30 amp breaker. anything less and you may be resetting the breaker when the unit first turns on. Dont forget 30 amp breakers will require # 10 wire or larger, #12 just wont do.
When mine hums and trips, it is one of two things, Not warm enough, only does this when it is cold out, and 2 would be not enough juice, I have to have a 20 amp breaker or it doesn't run. And if I use a cord, it has to big. The slightest drop in amperage and it will not run, yours might have the same problem, mine is only 1 1/2 HP. It draws some 16 amps at start up and then idles down to 13 to run. A 15 amp breaker, forget it. Cold out, forget it. It wasn't just mine though, we did a house last winter and made one bathroom heated with a gas heater with 3 compressors in there just to keep them warm, there was no room for us. Hope this helps.
Sometimes the initial start up with the tank at 0 psi electric power is adequate. However when the tank is full or the garage is cold it is a bigger load for start up. Check your overload (reset button) and breaker. If 220 volts one side of the breaker could be tripped without showing.
Check the reset button on the motor to see if it tripped. The motor may be overheating. Some motors have an internal breaker and they have to cool off before they restart. Also check the pressure switch. Move the switch back and forth ( on and off ) and listen for a click. If it doesn't click with low to no air pressure then the switch is bad.
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