Tom Snape
Well-known member
It kicks out after running about 10 minutes, even if the motor is unloaded (blade completely off the wheel). This only started happening last week.
It's a 1.5 hp 1 ph 220 motor, Italian made. There is no start capacitor. There is a 60uf run capacitor. I had the capacitor tested, and it tested 60.5 uf. The motor always ran hot; there is a warning label on the motor stating max. temp is 70 deg C. I attached a thermocouple to the ground lug on the motor case and it read 56 deg C when the motor tripped, but after that rose to 76 deg C. So I do think the motor is getting hot inside, and the temperature switch is opening.
The start/stop switch on this thing is another European part (I got a quote of $198 to replace it). It has a coil that holds the contacts closed and the temperature switch in the motor is in series with the coil, so when the temperature switch opens, the start/stop switch coil is de-energized and the contacts open. A Laguna rep suggested the switch is bad, but I don't think that's the problem, because I can always run about 10 mins and then it trips. My test with the thermocouple tells me the motor is going over temperature. I think the temperature switch is doing it's job.
So back to the motor; either the motor is going bad, or the run capacitor isn't working right and messing up the phase of the second winding, which could also make the motor run hotter. Even though it tested out okay on a multimeter, I ordered a new $20 capacitor to try first because if that's not it I think I'm looking at a big bill (or a new saw?)
The motor mount is a 80C face, which I never heard of and can't find from US distributors. I could have a new mount made for a 56C motor. If I went with that, I'd probably also have to have the drive pulley modified to match the motor shaft. Also, Laguna rep told me they sell upgrade kits using US spec motors, but I'm sure it's pricey.
It's a 1.5 hp 1 ph 220 motor, Italian made. There is no start capacitor. There is a 60uf run capacitor. I had the capacitor tested, and it tested 60.5 uf. The motor always ran hot; there is a warning label on the motor stating max. temp is 70 deg C. I attached a thermocouple to the ground lug on the motor case and it read 56 deg C when the motor tripped, but after that rose to 76 deg C. So I do think the motor is getting hot inside, and the temperature switch is opening.
The start/stop switch on this thing is another European part (I got a quote of $198 to replace it). It has a coil that holds the contacts closed and the temperature switch in the motor is in series with the coil, so when the temperature switch opens, the start/stop switch coil is de-energized and the contacts open. A Laguna rep suggested the switch is bad, but I don't think that's the problem, because I can always run about 10 mins and then it trips. My test with the thermocouple tells me the motor is going over temperature. I think the temperature switch is doing it's job.
So back to the motor; either the motor is going bad, or the run capacitor isn't working right and messing up the phase of the second winding, which could also make the motor run hotter. Even though it tested out okay on a multimeter, I ordered a new $20 capacitor to try first because if that's not it I think I'm looking at a big bill (or a new saw?)
The motor mount is a 80C face, which I never heard of and can't find from US distributors. I could have a new mount made for a 56C motor. If I went with that, I'd probably also have to have the drive pulley modified to match the motor shaft. Also, Laguna rep told me they sell upgrade kits using US spec motors, but I'm sure it's pricey.
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