kozman
noticing nice landscape pebbles
Member since July 2020
Posts: 83
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Post by kozman on Aug 9, 2020 19:48:17 GMT -5
Does the motor have red push button somewhere on the motor? Usually mounted on the motor's attached electrical box. That's the thermal overload switch. You push it in to reset it. It can push in a little harder than a normal switch. I'm thinking the saw got stuck and tripped the thermal protection switch. Peace, kozman
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EricD
Cave Dweller
High in the Mountains
Member since November 2019
Posts: 1,142
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Post by EricD on Aug 9, 2020 22:43:44 GMT -5
Sounds like you need a motor. As usual check connections and if you have a volt meter check your voltage. As you guessed the thermal protection is integrated. No manual reset. Good luck man.
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Post by pauls on Aug 10, 2020 0:25:42 GMT -5
Have you checked the dead obvious things like swapping to a different outlet. Check the continuity of the lead with an ohm meter, from the plug to the motor connection. If it has capacitors they can be checked by using your Ohm meter. If they measure as a short circuit they are faulty. They should show as a measurement that gradually drops to zero over a few seconds as the capacitor charges up, swap the polarity of the meter leads and the meter should give a sizeable kick as the capacitor discharges through the meter then drops back to zero. Check the continuity through the thermal cutout, it should be a short circuit. This is best with an analogue meter, One with a needle. Use the 1000 Ohm scale. Take the end plate off and have a look at the contacts, I have had an earwig crawl into the contacts of my house pressure pump, nearly cost me $1000 until I saw its fried body.
Of coarse do all this with the thing unplugged from the power, It might sound complex but it's not, and really what have you got to lose? If you find the problem you have saved yourself several hundred bucks, if you don't find the problem you have wasted a bit of time but learnt how to test a motor.
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geotech
off to a rocking start
Member since June 2018
Posts: 10
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Post by geotech on Aug 10, 2020 4:19:38 GMT -5
My slab saw has a Dayton 1.5hp 120v motor that decided to stop mid cut the other day. No burning smell, strange noises, or tripping of the circuit breaker. I figured the thermal protection could have come into play due to the warm weather, and the motor felt pretty warm when I checked it. What you said about the warm weather could be correct. Pauls gave you some good info on several checkpoints. First question is, is there a reset button? If not it has an automatic reset. It is not that uncommon for one to open & not reset itself. Next is there an open winding? You stated no burning smell which again is another thing that can happen with no smell or one that was not detected if it did burn out making a very slight odor. Especially if you are using oil for cutting & it's helping to mask odors. Is the motor sealed or "open air"? Open air is one of the most neglected problem child in the motor industry. A good going over with an air compressor can help that problem tremendously, however that is not the problem at this point, but it is a preventative measure for the future. Good luck.
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herb
spending too much on rocks
Member since November 2011
Posts: 444
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Post by herb on Aug 10, 2020 13:14:00 GMT -5
Could also be a faulty on/off switch on the saw, or a loose connection at the switch...
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Post by knave on Aug 10, 2020 14:25:31 GMT -5
Double check with a meter to verify you have 120vac at the L1/N terminals on the motor.
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zarguy
fully equipped rock polisher
Cedar City, Utah - rockhound heaven!
Member since December 2005
Posts: 1,791
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Post by zarguy on Aug 10, 2020 17:29:56 GMT -5
Try turning the saw on & moving the blade pulley by hand. Kind of like push-starting a car. Lynn
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Post by knave on Aug 10, 2020 17:54:51 GMT -5
If the motor makes no sound and is cool to the touch:
1 not powered 2 open thermal safety 3 open winding
A bad capacitor the motor will hum and get hot.
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