Originally Posted by micromind

One reason is because old-timers can repair a wye-delta starter, but not anything electronic.

Originally Posted by dronai

I found this on another site. I figured someone here would know. Looks to be IEC standard, not Nema


We have a 125 HP, 3 phase, 480VAC motor that has six leads coming out of the motor. Two leads are labeled "U2", two are labeled "V2", and two are labeled "W2". So I have 3 pairs of leads with the same label on them. Checking resistance between any two of the leads labeled the same indicates no continuity. However, you can read continuity between a U,V,W set. This indicates to me that there are two independent sets of motor windings. The debate between my co-workers is how to connect this motor. The thoughts are to connect both wires labeled the same to a leg of 3 phase. The other is to only connect one set of windings to the 3 phase. By the way, the motor cover shows a connection diagram for 9 wires. Any help is greatly appreciated.

Originally Posted by HARRY304E

Who is a stiff..?

Originally Posted by frenchelectrican

That is double "delta" connection that is little odd for straight 480 volt hook up.( for the IEC type motours unless they are large motor size then it will be common )

There are some case you will see same size tails that can be part winding start.

Whatever the reason if you have VFD or start on DOL { direct on line } on smaller motours always wired them up in delta otherwise you will burn up the windings { not very often you will see double Wye connected for running mode.}

The otherwise the Motourwinder did have the correct sequince of connections ditto with dronai's link for the connection.

Merci,
Marc

Originally Posted by Motorwinder

I really am a motor winder BTW. This is the one I did today..


Back to the regular scheduled program..

Originally Posted by retiredsparktech

Looks like the kind of motors we used to build. Worked at the Louis Allis Co. in Milwaukee 33 years. I see you have VPI equipment. Do you also do form-coil jobs as well. Very interesing business. It keeps you on your toes.

Originally Posted by Motorwinder

Not a delta. If you have continuity U, V and W, that indicates internal wyes. If it was delta or wye/delta, You'd have continuity between 3 pairs. Probably wouldn't be able to run part-winding either. It's possible, but why would a winder connect a part-winding connection and not mark it accordingly. Someone rewound it and brought out 6 leads is all.