220v to 110v change over - Woodworking Talk - Woodworkers Forum
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post #1 of 10 Old 11-08-2019, 09:09 PM Thread Starter
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220v to 110v change over

I have a Square D magnetic switch on my Unisaw.
I need to switch everything to 110v until I get my 220v service finished.
Iím not quite sure how to change the switch wiring to 110v.
Hoping someone can interpret what Iím looking at.



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post #2 of 10 Old 11-09-2019, 03:37 PM
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I will try to explain it, not sire if I can but it is pretty easy







You remove the jumper shown in the middle of the coil in the schematic, right below the picture it shows the jumpers going to the incoming lines. For 240 the coils are in series and for 120 you parallel them


Down in the right hand side of the schematic it shows doing the same thing to the motor


It is real easy to do but hard to explain

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post #3 of 10 Old 11-09-2019, 04:53 PM Thread Starter
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Quote:
Originally Posted by Catpower View Post
I will try to explain it, not sire if I can but it is pretty easy

You remove the jumper shown in the middle of the coil in the schematic, right below the picture it shows the jumpers going to the incoming lines. For 240 the coils are in series and for 120 you parallel them

Down in the right hand side of the schematic it shows doing the same thing to the motor

It is real easy to do but hard to explain

Do I have to change the heater?


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post #4 of 10 Old 11-09-2019, 05:16 PM
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Do I have to change the heater?


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Shouldn't have to, they are rated in amps, but actually they sense watts and they would be the same
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post #5 of 10 Old 11-11-2019, 01:33 AM
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Quote:
Originally Posted by DavidR8 View Post
Do I have to change the heater?
B22.0 heater are rated for 14-16.1 amps, so unless you have a 1hp motor you need to change one
to save $$, only change one heater in the hot wire, bypass the starter on the neutral wire
typically the amperage doubles when stepping down from 240v to 120v
look inside the starter cover for a heater chart, i couldn't find a readable chart to post


as for wiring i'd go by the motor wiring diagram not the starter diagram
post up a picture of the motor plate
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Last edited by _Ogre; 11-11-2019 at 01:42 AM.
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post #6 of 10 Old 11-12-2019, 03:43 PM
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After I read Orge's post and thought about it, the motor on your Unisaw is 3 HP I do believe, I got the 5 hp option on mine but I think 3 is the smallest, and it can't be wired for 120, so it looks like you are going to have to wait for 240

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post #7 of 10 Old 11-12-2019, 04:18 PM
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nope nope nope, good catch catpower

orge is a round fruit
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post #8 of 10 Old 11-12-2019, 05:13 PM
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nope nope nope, good catch catpower

orge is a round fruit



My fat fingers don't spell very well LOL

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post #9 of 10 Old 11-13-2019, 12:31 AM Thread Starter
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220v to 110v change over

Quote:
Originally Posted by Catpower View Post
After I read Orge's post and thought about it, the motor on your Unisaw is 3 HP I do believe, I got the 5 hp option on mine but I think 3 is the smallest, and it can't be wired for 120, so it looks like you are going to have to wait for 240

Actually itís 1.5 hp. Itís a 1965 model.
240v is not far off as over the long weekend I ran 240v service to the shop. Now all I have to do is wire the interior.



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Last edited by DavidR8; 11-13-2019 at 12:49 AM.
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post #10 of 10 Old 11-13-2019, 04:59 PM
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Actually itís 1.5 hp. Itís a 1965 model.
240v is not far off as over the long weekend I ran 240v service to the shop. Now all I have to do is wire the interior.



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Then it would work, on a lot of those that vintage all you had to do was flip a switch on the side of the motor to "rewire" it to 120


And the thermal units you have would probably handle 1 1/2 HP if you didn't push it real hard for a long time, those things take a while to get hot enough to trip

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