Motor Wiring

Terry G · Apr 7, 2016

I have this 230V 3 Phase motor that is wired like the left side of picture #2. It has a speed selector switch with 3 wires from each side going to the motor connections (picture #3). What is the diagram on the right side of picture #2. Is this another way to wire it and what would that give me. This is on a metal lathe and I am going to run it with a VFD. Just want to make sure the motor is wired right for the VFD. Thanks for any help.

Bob · Apr 7, 2016

Left diagram shows "DELTA" connections, right is "WYE" connections. Consult the instructions for your VFD to see what the desired configuration is for your unit.
Phase Converters and Delta vs. Wye Configured Three Phase Power

buickanddeere · Apr 7, 2016

(reply to post at 12:58:21 04/07/16)

High speed mode has reduced the number of poles . The motor's cooling fan will work better with the motor in the high speed mode.
Use the gearbox to reduce speed and keep the motor up near rated rpms.

Terry G · Apr 7, 2016

So to wire it for wye would I tie 1U, 1V and 1W together and run the 3 power wires to 2U, 2V, and 2W? And I guess this would be just a single speed then? I may not need to do this but would like to have some understanding of it any way.

4020 electrician · Apr 7, 2016

There should be a metal "strip" that bolts to the motor studs? Usually wired delta but I'd have a qualified person look at the whole situation. We don't cost that much...

47fivewindow · Apr 7, 2016

In Y you have two fields in series with a voltage drop of 110v on each field. on Delta you have 220v drop on each field. I would try it the way its wired now, in delta

buickanddeere · Apr 7, 2016

Could be this configuration ?

https://www.google.ca/search?q=Y+delta+two+speed+three+phase+connection&rlz=1C1KMZB_enCA649CA665&espv=2&biw=1280&bih=675&tbm=isch&tbo=u&source=univ&sa=X&ved=0ahUKEwi5rseK4v3LAhWCiRoKHQTgAscQsAQIGg#tbm=isch&q=Y+delta+two+speed+three+phase+six+terminals&imgrc=vgty8xcDrRt34M%3A

47fivewindow · Apr 7, 2016

I think you nailed it BD. The jumpers appear to go under the block.

47fivewindow · Apr 7, 2016

we would have to see where the heavy flat white wires go under the block. I know this is confusing, an electrician should involved before you add any more jumpers. IMHO

Terry G · Apr 7, 2016

A little more information. There are no jumpers on the connection block on the motor. I took the speed selector switch off and traced the wires on it. It is configured so on speed 1 power is applied to 2U, 2V, 2W and (1U, 1V, 1W) are jumpered together in the speed switch just like the diagram on the right. On speed 2 power is applied to 1U, 1V and 1W and nothing is connected to 2U, 2V and 2W just like the diagram on the left. I am assuming the high speed is speed 2 as the switch was not labeled low and high, does that look right? Thanks for all of your replies, there's so much good information on this forum.

Motor Wiring

Terry G

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Bob

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buickanddeere

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Terry G

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4020 electrician

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47fivewindow

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buickanddeere

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47fivewindow

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47fivewindow

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Terry G

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