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Old 10-05-2010, 10:18 PM   #1
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old 220V motor how to wire


I picked up an old motor maybe 1960's or 1970's, it is a dual voltage 120/240. The plate that has the brand, and the wiring diagram has been rubbed enough it cannot be read anymore. my question is there are 6 wires coming out of it all are black and they are all of the same gauge. 3 of them were tied together with a wire nut. Is there a way I can find out which of the wires are the two hots and which is ground. I want to wire it for 220V. none of the wires are labeled. any help is appreciated. And just out of curiosity how would the wiring differ if I were to do wire it for 110V.
thanks

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Old 10-06-2010, 11:37 AM   #2
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old 220V motor how to wire


Take it to a motor shop and have them mark the leads for you. You will not be successful if you have no meter and no idea of what your doing. 3 leads tied together and three leads remaining sounds like it could be a three phase motor. How do you know its 120/230 if the nameplate is not readable?

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Old 10-06-2010, 01:12 PM   #3
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Not much info......If I had to guess it w ould be this.....Motor has 6 leads 2 of the leads are the start winding (higher resistance) and the other 4 are the "run" windings that are hooked up in series for 240v and paralell for 120v....so for 240v you would have 3 connected together (1 start and 2 run ) the other leads would be start/run together......and a run lead. To reverse direction chance start leads.
This is for single phase.....3 phase is something else. You MUST have a meter to check the windings. If you are lost...take it to a motor shop. Really need more info.
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Old 10-06-2010, 08:02 PM   #4
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old 220V motor how to wire


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Originally Posted by mxkjk2 View Post
I picked up an old motor maybe 1960's or 1970's, it is a dual voltage 120/240. The plate that has the brand, and the wiring diagram has been rubbed enough it cannot be read anymore. my question is there are 6 wires coming out of it all are black and they are all of the same gauge. 3 of them were tied together with a wire nut. Is there a way I can find out which of the wires are the two hots and which is ground. I want to wire it for 220V. none of the wires are labeled. any help is appreciated. And just out of curiosity how would the wiring differ if I were to do wire it for 110V.
thanks
The quickest way to tell is you have to look at the conductor it will stamp the numbers on it.

For typical 240 volt single phase motor with 6 leads here the connection are.

For CW rotation L-1 to T1 while the L2 to T4 and T5 however the rest of three conductors you will have to join with wirenut ( T2,T3,T8)

To reverse the rotation just swap the T5 and T8

For 120 volt connection this will be diffrent

L-1 to T1,T3,T8 and L-2 to T2,T4,T5

To reverse it again swap T5 and T8

Again please look at the motour leads carefull it will always be stamped with numbers.

Merci.
Marc
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Old 10-07-2010, 05:03 AM   #5
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What the heck are you going to use an "old"motor for?
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Old 10-08-2010, 04:27 PM   #6
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Take it to a motor shop and have them mark the leads for you. You will not be successful if you have no meter and no idea of what your doing. 3 leads tied together and three leads remaining sounds like it could be a three phase motor. How do you know its 120/230 if the nameplate is not readable?
I do have a meter to test resistance with, I just don't know what leads to test between and what values I should be seeing when i put my meter on them
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Old 10-08-2010, 04:28 PM   #7
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What the heck are you going to use an "old"motor for?
I am going to use it on an old westinghouse two stage compressor
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Old 10-08-2010, 04:30 PM   #8
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Originally Posted by J. V. View Post
Take it to a motor shop and have them mark the leads for you. You will not be successful if you have no meter and no idea of what your doing. 3 leads tied together and three leads remaining sounds like it could be a three phase motor. How do you know its 120/230 if the nameplate is not readable?
Most of the writing on the name plate is not readable any more, but some of the info was punched into the plate such as the HP, phase, current draw..s so i know it is a dual voltage single phase 2 horse motor.
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Old 10-08-2010, 04:35 PM   #9
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Not much info......If I had to guess it w ould be this.....Motor has 6 leads 2 of the leads are the start winding (higher resistance) and the other 4 are the "run" windings that are hooked up in series for 240v and paralell for 120v....so for 240v you would have 3 connected together (1 start and 2 run ) the other leads would be start/run together......and a run lead. To reverse direction chance start leads.
This is for single phase.....3 phase is something else. You MUST have a meter to check the windings. If you are lost...take it to a motor shop. Really need more info.
could you be more specific, how much resistance should I have between the start winding leads, how much resistance should I see between the start lead and some of the other leads. Can I figure out which leads are which with an ohmmeter?
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Old 10-09-2010, 01:13 AM   #10
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Old 10-09-2010, 01:22 AM   #11
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This Drawing is BASIC. I cannot give you the ohms readings of the windings. If you hook up the motor and it does not start change either #1 with #3 or #2 with #4 but NOT both. To reverse exchange the Start winding leads only. Hope this helps some.

L

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