Yup. I’ve come to learn that now and the old shop told me completely wrong and I didn’t even bother to double check it. Still my fault and a lesson learned. Thankful for eBay thoughluckily, transformers don't care about polarity.
But, for 220v operation the input is:
H1 is R
H2 is S
Output 110v :
2 to X3 and 1 to X1
BTW, the original transformer was tapped for 110v in pictures 3,4,5 in post #1
that released the smoke when 220v power was applied
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Don’t know what happen but there’s smoke.
- Thread starter Munky
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It may have been that the lathe was run on 120V single phase, that is the default single phase per the manual. Running off of 220V single phase you would also need to check the motor/switch connections. By dumping 220VAC into the transformer wired on the 110VAC tap, there may have been other components damaged from the higher output voltage, I would check the transformer fuse as well as the contactor coils. Motor may also not have been to happy to get 2X the rated voltage if it is wired for 110VAC.
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You'll need to re-configure the motor for 220v as shown: pick either red wire as #1 and tape the other
If you can't get all three lugs under the screw you can move one over to the N.C. position
or fasten them together with a screw and nut + tape or heat-shrink tubing
Swap the two blacks if necessary to invert motor direction
The forward contactor might have an open coil unless you were lucky and shut it off quick enough
Used machinery often comes with "bonus features" like messed up electrics
If you can't get all three lugs under the screw you can move one over to the N.C. position
or fasten them together with a screw and nut + tape or heat-shrink tubing
Swap the two blacks if necessary to invert motor direction
The forward contactor might have an open coil unless you were lucky and shut it off quick enough
Used machinery often comes with "bonus features" like messed up electrics
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Thank you so much for that. But curious.
Could I not just run it with 220 coming into the transformer and 110 coming out which is what originally was powering the lathe motor which is also wired to low voltage.
Do I really need to convert everything over to high voltage?
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Electrical stuff works on smoke, if you release the smoke it'll stop working.
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Where AC motors are concerned the higher voltage is better.
You wouldn't want 220 just for the transformer and 110 to the motor- makes no sense efficiency-wise
Motors work better and contacts last longer on 220v due to the lower current- less voltage drops in your supply lines etc.
The transformer powers the control circuits only, not the motor itself- and even though the contactor coils operate on 110 you still
want a transformer there for safety reasons
You wouldn't want 220 just for the transformer and 110 to the motor- makes no sense efficiency-wise
Motors work better and contacts last longer on 220v due to the lower current- less voltage drops in your supply lines etc.
The transformer powers the control circuits only, not the motor itself- and even though the contactor coils operate on 110 you still
want a transformer there for safety reasons
Last edited:
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Not usually done, but i have seen it.
120/220v dual voltage single phase motors run the windings in series, for 220v operation. If the center point between the series windings is tapped , 120v potential can be utilized .
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Retapping the motor for 220 is not monumental
Im not against wiring up the motor up for 220, and if so, would that even require me to have a transformer?
How would I go about wiring the electrical box if 220v was the smarter more appropriate route.
Realized ill still need controllers powered by 110 so transformer is staying but ill rewire the motor as per marks suggestions and recommendations
How would I go about wiring the electrical box if 220v was the smarter more appropriate route.
Realized ill still need controllers powered by 110 so transformer is staying but ill rewire the motor as per marks suggestions and recommendations
This made alot more sense when I slowed down and read it twice.
