Rockwell motor help

[Unwelcomedguest]

I recently got my hands on a rockwell 48in belt sander, worked for the first day no real issues. Now the motor wont rotate with the v belt attached and trips the main breaker after 10-15 seconds of trying. It is a rockwell dual voltage reverable 1hp motor. Since the motor runs no issue when it is not under load the running theory is the wiring is not done correctly, I tried testing the connectors but quickly realized I have no idea what I'm doing Attached is a picture of how the wiring is setup. The starter is a furnas cat. number 16CC104408A.

 

[wyliesdiesels]

First start by running the motor with no load

Does it trip?

If yes, then could be something with the motor OR the trip setting on the overload is wrong or the heaters are the wrong size.

what is the trip setting set to? or if it has heaters, what are they rated for?

looks like its heaters.....

 

[Norcal]

Is it tripping a breaker, or the overload on the Furnas magnetic starter? See that it is a single phase model is it possible that someone reconnected the motor for 120 volt operation and did not replace the heater coil as mentioned by Wyliesdiesels. E56 heater coil rating is 10.5-12A. So may not be the case.

 

[Terry D]

So the motor runs fine not connected to the sander. Is the bearings on the sander ok. Is the sanding belt to tight.

It is tripping the branch circuit breaker, not the heaters right.

Are you running it on the same voltage that the previous owner had it running on. Is there a plug on the cord or is it hardwired.

When you say it ran with no real issues the first day, Did it start up fine every time. Did you do anything to it that may have caused this

 

[My Old Tools]

Probably a 230v motor running on 115v. Or the start capacitor is dying.

 

[nadogail]

Please share what you find out, all the above comments were excellent.

 

[Dagny]

I'm going with start capacitor since it worked fine at first.

 

[exmaxima1]

If the motor is non-enclosed, try blowing any dust out of the motor. It may have clogged the centrifugal switch contacts.

 

[Unwelcomedguest]

Sorry for the delay in updating been busy. It trips the main breaker on a 1200 watt generator, the overheat coil hasn't tripped once.
Yes the wiring is the same as when I recieved the sander though i had to replace the power cord as it was frayed. I have yet to check the wiring on the motor itself to see if just the mag switch was changed to 120 and the motor left to 240 but that is the next step to check

 

[Terry D]

Sorry for the delay in updating been busy. It trips the main breaker on a 1200 watt generator, the overheat coil hasn't tripped once.
Yes the wiring is the same as when I recieved the sander though i had to replace the power cord as it was frayed. I have yet to check the wiring on the motor itself to see if just the mag switch was changed to 110 and the motor left to 220 but that is the next step to check

Are you running this on 120 or 240 volt.

Post a picture of the wiring diagram on the motor. And also post a pic of the motor wiring of how it is wired now

Also, change you voltages in your post to 120 and 240. They will eat you alive on here for posting those voltages

 

[Unwelcomedguest]

Thankfully it still had the numbers for the wires and it is wired for 120v. As for the heat coil it has a max of 11.3A. Since it is only a 1 hp motor and its wired for 120v does it even need the mag switch or can I just swap it to a manual switch without a problem?

 

[Bigblockyeti]

Sorry for the delay in updating been busy. It trips the main breaker on a 1200 watt generator, the overheat coil hasn't tripped once.
Yes the wiring is the same as when I recieved the sander though i had to replace the power cord as it was frayed. I have yet to check the wiring on the motor itself to see if just the mag switch was changed to 120 and the motor left to 240 but that is the next step to check

1,200W or 12,000W generator? 1,200 watts isn't enough to run that sander under load and might be able to occasionally start it with zero load.

I would certainly keep the magnetic starter, it will have more robust contacts than anything but an expensive switch and it has the added benefit of being a safety device should you loose power while it's energized.