compressor motor Qs

[war pony]

I was able to get an IR compressor from my work, when the motor gave out. I pulled the cover and found the switch had some arc marks on the contact points. This left some black marks on the coils and burned some of the string around the coils. Can any one tell me what to look for when I ohm this out? Should I replace the switch and try? Any help would be appreciated. It looks like a Baldor 230 v single phase 7.5 hp.

[FullsizeYota]

at work i just make sure i have continuity through the motor...

[1tonIHs2]

Clean up the contacts with some emery cloth this will either work for awhile or just for testing purposes. Those little bastards have up to 80 amps goin through them when they break contact, so they dont stay pretty for long.

Next make sure the centrifugal switch operates smoothly, just push it in a few times and make sure it snaps out when released.

Then you should check the capacitors. The easiest way for the average joe to do this is with an anolog ohm meter. Discharge them with a screw driver across the terminals, make a diagram of how the caps are hooked up. It doesnt matter which terminals the wires go to. Now for the testing, with your tester on ohms touch the terminals, the needle will jump up and come back down quickly if its good. If it has no resistance or a steady resistance, its bad. Make sure you check a couple different ohms settings as it will vary with different sizes of caps.

Next just put the damn thing together and try it. Hook it to 110 vac to test it with no load.

This is what i do so if you have any questions let me know.

[war pony]

Clean up the contacts with some emery cloth this will either work for awhile or just for testing purposes. Those little bastards have up to 80 amps goin through them when they break contact, so they dont stay pretty for long.

Next make sure the centrifugal switch operates smoothly, just push it in a few times and make sure it snaps out when released.

Then you should check the capacitors. The easiest way for the average joe to do this is with an anolog ohm meter. Discharge them with a screw driver across the terminals, make a diagram of how the caps are hooked up. It doesnt matter which terminals the wires go to. Now for the testing, with your tester on ohms touch the terminals, the needle will jump up and come back down quickly if its good. If it has no resistance or a steady resistance, its bad. Make sure you check a couple different ohms settings as it will vary with different sizes of caps.

Next just put the damn thing together and try it. Hook it to 110 vac to test it with no load.

This is what i do so if you have any questions let me know.

Thanks for the help, My modem has been down for a few days and was unable to get back. I will try your suggestion and get back if I fail. Thanks again