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Tool Talk Discussion Forum

air compressor

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chvet73

11-17-2005 18:33:33




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Still trying to get this old air compressor working. It runs and builds up to about 60-70 pounds. At that point it starts acting like the pressure is more than the motor can handle. It makes a squeaky kind of noise and the motor overload button pops.
The motor is a new 3hp 115v. The pressure switch is new and does not cut out at that point. Its set to about 110 lbs. The unit is an old 20 gal. tank. It was originally a 220v machine. appreciate any ideas.

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Ken Combs

11-18-2005 08:30:55




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 Re: air compressor in reply to chvet73, 11-17-2005 18:33:33  
Check the motor RPM, if the old one was a 1725 and the new one is a 3450, you will need a pulley on the motor 1/2 the diameter of the original.



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KEB

11-17-2005 20:36:13




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 Re: air compressor in reply to chvet73, 11-17-2005 18:33:33  
Sounds like its taking more torque to turn the compressor at higher pressures than the motor is capable of producing. If you stall an electric motor, the current it draws will increase dramatically, and (hopefully) trip the overcurrent protection before burning up the motor.

You can increase the torque at the compressor shaft by putting a smaller pulley on the motor or a bigger pulley on the compressor (or both), effectively giving the motor a bigger mechanical advantage. The compressor will turn slower, but there will be more torque available at the compressor shaft to overcome the resistance of the piston pushing against higher pressures.

Horsepower comparisons between two motors don't mean anything unless the motors are also rated for the same speed. A 3600 RPM motor rated at 1 HP will produce half the torque of an 1800 RPM motor rated at 1 HP (torque x RPM x constant = power)

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old

11-17-2005 18:49:23




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 Re: air compressor in reply to chvet73, 11-17-2005 18:33:33  
First off what was the old motor rated at as far as HP. If it was the same 3HP well heres your problem. If you have a 3HP 110 volt motor it will heat up faster and use twice the amps as a 3HP 220 motor. And thats probably why its tripping the over load. But of course if the motor that came off was say a 5 HP a 3 HP will never cut it. And one other thing is that motor a compressor duty motor or just a plain jane motor that can also make a differance.

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chvet73

11-17-2005 19:36:52




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 Re: air compressor in reply to old, 11-17-2005 18:49:23  
The old motor was not the original. It"s rated at 12 amps with no HP shown on the label. The compressor is an old Mongomery Wards. Those did not tend to have a lot of HP. I have a similar 20gal IR with a 2hp 115v that has worked just fine. I bought that one new 20 years ago. The Monkey Wards is most likely older and I bought it used.



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chvet73

11-17-2005 20:04:49




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 Re: air compressor in reply to chvet73, 11-17-2005 19:36:52  
I forgot to add that the new motor is a compressor duty motor. The effect I'm getting is not like its a motor problem but that the pressure is so high in the compressor it can't turn over.



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Gene Davis (Ga.)

11-17-2005 19:29:46




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 Re: air compressor in reply to old, 11-17-2005 18:49:23  
Sounds like the tank check valve is letting the air bleed back into the compressor. Just had that issue on mine last week.



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chvet73

11-17-2005 20:13:46




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 Re: air compressor in reply to Gene Davis (Ga.), 11-17-2005 19:29:46  
Gene did you replace that or repair it. I think that sounds like a possible too.



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chvet73

11-17-2005 20:06:47




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 Re: air compressor in reply to Gene Davis (Ga.), 11-17-2005 19:29:46  
Gene did you replace that or repair it. I think that sounds like a possible too.



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