need help wiring table saw for 220V

[mike93lx]

Lol so 115v won’t run that motor cause it’s not from Asia ?

You are attacking a hill that Norcal has committed his life to defending.

 

[dogdog]

You are attacking a hill that Norcal has committed his life to defending.

Man hate to discuss about the metric system with him then

 

[Innovate1]

If the motor is overheating due to voltage drop, then the overloads are not working properly

That's totally wrong for small motors like the OP is talking about, maybe true for larger motors. If the motor overheats enough (due to voltage drop, overload, etc) then the temp cutout in the motor (which most should have, don't know if all do) will eventually trip. It's hard on the motor to get that hot - I have seen motors where the paint discolors from the heat before the winding protector trips although in that case it was a motor that was powered for hours and not turning. The temp protector would open the circuit and after it cooled slightly it would turn on again. And it may not pull enough current to trip a breaker. Excess voltage drop may also prevent a motor from coming up to full speed too. Running saws on long, too light extension cords is a good way to run into this problem - been there done that but realized the problem immediately and shut things off before it caused any damage.

 

[Firebrick43]

 

[Lassen Forge]

Lol so 115v won’t run that motor cause it’s not from Asia ?

No, because the voltage in Japan is 100 VAC. I'm still trying to figure out the 32 VDC generators... if you hooked 4 in series, could you run a 120V light bulb? And our garbage pump (and sewer pump) motors on the bridge were all 400 VAC...
So, I have a theoretical (probably silly, but curiosity makes me wonder)... we all know about single phase, and 3 phase power... would it be possible to build a generator winding to provide 5 phase power, would that make it 100 Hz? Would it be smoother than 3 phase? And most important, would it power the replicator in my kitchen (salvaged from a "vehicular accident in New Mexico") and still charge my tesla and particle beam rifle? Asking for a friend...

 

[dogdog]

So, I have a theoretical (probably silly, but curiosity makes me wonder)... we all know about single phase, and 3 phase power... would it be possible to build a generator winding to provide 5 phase power, would that make it 100 Hz? Would it be smoother than 3 phase?

I think this guy explains it better than me... instead of 5 it's 6.
I think 5 is duable as well as long as it is divisable into 360 and work with the Sine. 100Hz have nothing to do with phase. your googlefoo can probably go dig up the calculations for 120deg vs 72 deg phase angle(i think that is the term)

now would a 100V motor work on 120Vac if both are design for 60Hz single phase?

or if you put 4x 32Vdc in series would it power a 120V light bulb LED or incandescent ?

lol who knows. you might have to sliced the bulbs up with the samurai sword in 1/4 to make it work.. but I am pretty sure 115Vac 60hz would power the 120Vac 60hz motor fine.

 

[dogdog]

No, because the voltage in Japan is 100 VAC. I'm still trying to figure out the 32 VDC generators... if you hooked 4 in series, could you run a 120V light bulb?

I wonder if you do the math how would you determine the 100Vac 60hz would not run a 120Vac 60hz motor ? I am not a motor expert..

****Just asking for a "friend"

 

[wyliesdiesels]

That's totally wrong for small motors like the OP is talking about, maybe true for larger motors. If the motor overheats enough (due to voltage drop, overload, etc) then the temp cutout in the motor (which most should have, don't know if all do) will eventually trip. It's hard on the motor to get that hot - I have seen motors where the paint discolors from the heat before the winding protector trips although in that case it was a motor that was powered for hours and not turning. The temp protector would open the circuit and after it cooled slightly it would turn on again. And it may not pull enough current to trip a breaker. Excess voltage drop may also prevent a motor from coming up to full speed too. Running saws on long, too light extension cords is a good way to run into this problem - been there done that but realized the problem immediately and shut things off before it caused any damage.

im not talking about a temp protector that is tied to a temp sensor that is found in some motors. im literally talking about the overloads ie the red reset button

and i have a 3hp compressor motor that has a red reset button. when the run capacitor somehow disconnected itself inside the motor, the motor started to overheat and the internal overload tripped before any of the things you mention happened....

 

[Innovate1]

im not talking about a temp protector that is tied to a temp sensor that is found in some motors. im literally talking about the overloads ie the red reset button

and i have a 3hp compressor motor that has a red reset button. when the run capacitor somehow disconnected itself inside the motor, the motor started to overheat and the internal overload tripped before any of the things you mention happened....

Fair enough. But I seriously doubt the Craftsman table saw in the OP has any such thing.

 

[BTL-A4]

It does have a "resettable thermal-overload relay". I've tripped the house breakers a few times using the saw. It's a 15A motor on a 30A circuit that is shared with a bedroom. It's now on it's own 240V (by that I mean the nominal 240V found in the US) circuit.

*CORRECTION: The TS is on a 15A circuit NOT shared with a bedroom.

 

[sparky 1971]

It does have a "resettable thermal-overload relay". I've tripped the house breakers a few times using the saw. It's a 15A motor on a 30A circuit that is shared with a bedroom. It's now on it's own 240V (by that I mean the nominal 240V found in the US) circuit.

No bedroom should be on a 30 amp circuit regardless of whether it's a shared circuit or not. It's probably a 15 amp circuit that someone stuck a 30 amp breaker on. It's possible, but not probable, that it's a 20 amp circuit.

 

[wyliesdiesels]

Fair enough. But I seriously doubt the Craftsman table saw in the OP has any such thing.

why? how else is thermal overload protection for the motor supposed to be provided? the breaker wont do it

 

[wyliesdiesels]

It does have a "resettable thermal-overload relay". I've tripped the house breakers a few times using the saw. It's a 15A motor on a 30A circuit that is shared with a bedroom. It's now on it's own 240V (by that I mean the nominal 240V found in the US) circuit.

you sure its a 30a circuit? did they use 10ga wire? do you have a picture? that needs to be fixed if the breaker is indeed 30a rated for standard nema 5-15 receptacles...

 

[Innovate1]

why? how else is thermal overload protection for the motor supposed to be provided? the breaker wont do it

The ones I have seen just have a thermal protector in the winding. Some of those are automatic reset and some are manual reset. For this application I think the manual reset would be best and probably required by safety agencies so the saw doesn't restart when not expected. More recent models may have a thermal overload relay - just haven't seen that (or maybe didn't recognize it).

 

[BTL-A4]

you sure its a 30a circuit? did they use 10ga wire? do you have a picture? that needs to be fixed if the breaker is indeed 30a rated for standard nema 5-15 receptacles...

I just checked; it's a 15A circuit that is NOT shared with the bedroom. My mistake! Doh! That would explain why the TS was always tripping it; the TS is 15A.

 

[BTL-A4]

The ones I have seen just have a thermal protector in the winding. Some of those are automatic reset and some are manual reset. For this application I think the manual reset would be best and probably required by safety agencies so the saw doesn't restart when not expected. More recent models may have a thermal overload relay - just haven't seen that (or maybe didn't recognize it).

My TS has a manual reset switch on the switch box.