Air Compressor

[73novaguy]

Well guys. I know it has been awhile, but this has been an ongoing process of the air compressor kicking my butt. I went with the older Ingersoll-Rand 2 stage compressor that I picked up for 50 bucks, and then had a guy in town build me a 7.5 hp motor for it. After tinkering with different formulas to get the right size pulley on the motor I thought I finally had it figured out. So I strap the belts on and hit the breaker (30amp) and it runs for about 2 seconds. I thought maybe I didn't flip breaker all of the way. So now I only have 10/3 ran from the house to the garage and the max amps on the wire is 30. So 40 amp breakers are out of the question ulness I dig up 200ft of 10/3 burried wire. I tried opening the valve in the compressor thinking it will draw less and maybe get it up and running. Same 2 seconds as before! So i took the belts off the motor and it runs great! The motor will hardly draw any current by itself, but as soon as I hook up the compressor (which seems fairly easy to turn over) it pops the breaker! Any suggestions? Ditch the project, get my money back and buy a newer setup? I'm just flustered is all! I am not in a huge hurry to get a compresor cause i have no need for air tools at the moment, but an another month or two I def will!

[68protouring454]

are you sure the compressor you got had a 7.5 hp onit? also on tag on compressor it should say what rpms it should spin, and on the new motor you bought you should be able to see how many amps it needs to run, on startup is when it uses max amps after starting it drops back down, i am gonna say for a 7.5 hp motor it is around 32-35 amps, so yeah you need a bigger breaker, you might have wanted to check amp rating on motor before wiring it up, also burying 200 ft of wire there will be a decent amount of amperage drop, i would size the wire up 1-2 sizes big going that far, let us know
jake