Re: OT Electric Motor Question

Thank you all for the replies.

I believe that what Jon and Sven say applies in this case. The
nameplate specifically only says 440 STAR (WYE) and mentions nothing
about the Voltage for Delta. It does however have the wiring diagram
for Star and Delta, exactly as Sven shows. Since my original query, I
have started the motor in Delta mode on 240 VAC, using only a couple
of capacitors (I was starting from single phase). The motor starts
instantly and runs quiet and cool. Now I have to try the same thing
with actual load on the motor and see waht happens.

Regards
Tom csibor

--- In CAD_CAM_EDM_DRO@y..., Sven Peter <peteryco@r...> wrote:
> Hello Tom,
> Finally an electric cuestion out of my experience.
> Generally if you have both options you use the motor at 240V on
delta
> and 440V on star connection. Only if it says exclusively 440V
Star/delta
> then you have a motor you start in star and later switch it to
delta for
> not to have such a high initial current.
>
> Connection: RST=incoming line, UVW=coils
> Star 440V:
> R-U1
> S-V1
> T-W1
> W2-U2-V2
>
> Connection 240V Delta:
> R-U1-W2
> S-V1-U2
> T-W1-V2
>
> You are generally surposed to have the high line (208V to ground)
> in red on S and in order to switch the direction of turning
> you switch the lines R and T.
>
> I hope this helps a little further.
> Good luck
> Sven Peter
>
> tcsibor@v... wrote:
> >
> > Sorry for being a bit off topic, but I know that the knowledge on
> > this group can help. I have a machine with a 3 phase 440 VAC
motor.
> >
> > This motor (Bosch) has 6 leads and the wiring plate indicates
that it
> > can be wired star (Y) or Delta. The plate also says that it
is "440 Y
> > (star)"
> >
> > Does this mean that if it were wired delta, it would operate on
220
> > VAC? If not, then why would one set it up for Delta over Star or
vice
> > versa?
> >
> > Many thanks
> > Tom Csibor
> >
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