Paul et al,
    A little off topic but I'm having trouble getting an answer
to an electrical
    question
    I have and hope you or a member could help.
    I bought a surface grinder that runs 480v 3 phase. I have
220v 3 phase from an
    inverter. I have a  lead on a 480v 3 phase to 208v Y 3 phase
step down transformer.
    My question is can I run this transformer backwards and is
the 208 Y close enough to
    the 220v I have  ?

    Thanks,
    John Rogi

    That is a subject I know nothing about.

    Paul Lamar


Paul,
Now that surprises me, you have never ceased to amaze me with the
number subjects that you can address with authority. Computers,
engineering, cad/cam, aerodynamics, sailing, flying and of course
the rotary.
The same can be said of many of the individuals on the newsletter
and the group as a whole so perhaps one of them would be able to
confirm I can.

Thanks again,
John Rogi

I have a 3/4 HP 3 phase 220 volt motor for sale.

Paul Lamar


John:

Generally you can't use a step down transformer as a step up
transformer. The reason is, the secondary windings are typically
not heavy enough for the current flow for the step up. Yes it may
work for a while, but then the transformer starts to heat up and
the insulation on for the "secondary" windings breaks down and
your transformer may blow.

Next: your inverter may not be happy with the current draw to get
the current needed for the load at 480VAC.

Hope this helps.
Steve Thompson


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