Turned on table saw, heard small arc flash, tripped breaker. Have 120VAC into motor. Start and run capacitors aren't bulged. Motor spins freely. That's about the extent of my troubleshooting knowledge. 1.5 HP 1P 3450 part number A13922.
Just because the caps aren't bulged doesn't mean they're good, but, the arc flash and breaker trip makes me think it's deeper than that...you could pull some covers off, see if any connections or wires look burnt up...
I checked the thermal breaker and it looked fine, all visible wires looked normal. It arced right on startup.
Well, .8 ohms sounds about right to me. Generally if the start cap goes out the motor will try to start, but not have the power to spool up. The only thing I can say is to grab a meter and see if you have power at the connections under the motor cover(s) Wait a minute, you said you have 120vac to the motor...is this not a 220vac motor? If so you should have 120vac x 2, or 220vac if you test both legs at the same time.
Do you have a motor shop locally? They'll often times "take a quick peek" at one like that if you take it in to them, often times just charge for parts if it's something simple like the capacitor(s), which I suppose it could be, but like I said before, they will usually do something when you flip the switch (hum, turn slowly, something)
Does it have any contacts in it that are used on start up? Perhaps dusty?? not sure but just throwing it out there. Can you pull it out and maybe blow it out and try wiring it directly, so you eliminate everything else. Just guessing since I am an internal combustion guy I could be way off.
I have a spare motor that I swapped last night to get me back in business. It isn't as good as the old one but will get the job done until I can get this figured out. I don't see any contactors....everything is pretty covered up and I'm not really in the mood to go taking things apart right now. I have a buddy who can look at it but it will be a couple weeks before I can get it to his shop and he can take a look at it.
Start windings/centrifigal switch is likely culprit, area might just be gunked up with residual saw dust leavings. Start cap. is always a good guess also. Lot of variables so all of this is pure guess work.
At least you are up and running. This is what I was thinking , just not exactly sure what it was called.
