Re: [CAD_CAM_EDM_DRO] Re: OT Electric Motor Question

Dear John,
I had it in 2 ocasions that the motor was marked
380V 50Hz Star /Delta and had 2 diferent power indications
and obviously different current indications.
One was about 25Hp and the other more than 75Hp.
Both worked in a sawmill with a star delta starter,
were hooked on 440V 60Hz and were way older than me.
By the way they are still in use.
Best wishes
Sven Peter
.


Jon Elson wrote:

>
> Mark wrote:
>
> > Hello,I`m not sure if I`m putting this in the right place.If this
> > motor only has 440v and star and delta signs on the nameplate then I
> > would say that the six wires are the coil ends and the motor can only
> > be connected to 440v 3ph either star-delta or star.I can give you
> > more
> > info on how to identify the tails if you need it.all the best Mark
>
> If you figure out what the voltage across the windings is when the motor
> is wired in star (Wye) configuration, you will find it is 253 V
> Line-Neutral.
> If you now rewire it to Delta, you still need 253 V across the windings,
> which are now in a Line-Line connection. Therefore, the motor must
> be run from an approximately 253 V L-L source. There is no motor that
> runs on the same voltage in both Wye and Delta connections.
>
> Jon
>
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