Anyone know anything about air compressors???

[tgmcvay]

I have recently retrofitted a 30 gal craftsman tank with a HF twin cylinder 145psi 5hp pump and am using a 6 hp 110v 15.5amp 3750rpm motor. Using a 4.5"pulley on motor and 14.5" pulley on pump. I have it running and working until it hits around 70 to 80 psi then it pops the main 20 amp electrical panel breaker. I have it stepped down from 3/4" line to 1/2" to go into the tank with a new 1/2" check valve/unloader. Now my question to you is why is it popping the breaker? The motor is not getting hot nor is any of the electrical connections. I am pretty sure that the motor is to small for the pump and if so any recommendations on a motor size? If you think the motor is ok what do you think the problem is? I am stumped and need opinions and help.
Thank you all,
Tom

 

[pipsters]

The problem is the 110v 15.5 amp motor is no where close to 6 hp. It's under 2.0. The 6hp is peak voltage when started.

You need this to run that compressor pump:
http://www.northerntool.com/shop/tools/product_200306765_200306765

And it needs to be 220v.

 

[sometoyotaguy]

You could try a smaller pulley on the motor. It'll take longer, but won't work the motor quite so hard.

 

[larry_g]

Search my name and compressor or pump as I've addressed this problem many times here. If your motor has a nameplate look for amps or FLA and voltage. voltsxamps/760=hp So with 20 amps your limited to <2hp. I would have to see the specs on the pump to know what is requires to drive it at what RPM. So search that out and then come back with the specs for the pump. The pressure is of no use without other data.

lg
no neat sig line