Re: electrical help needed: kinda ot

rtr@...
That's a control transformer, It takes line voltage and reduces it to
control voltage. Depending on the year, the secondary winding on the
transformer is typically 110, 12, 24, or 48 vac. Other voltages are
sometimes found. Just look at the devices fed by that transformer. They
will be marked with the control voltage used on that machine. Of course
it's easier if you have a copy of the wiring diagrams. Manufacturere will
usually sell you a copy from their archives, though they sometimes will
give you a copy. If the primary uses four amps you will need a 220/240
or 208 volt (depending on your own mains) transformer that takes 8 amps on
the primary. If it is the secondary winding that provides 4 amps, then it
still only needs to provide 4 amps at the secondary voltage.

Don't forget that overload protection and full voltage coils must be
changed to handle the halved voltage and the doubled current. Control
circuits do not require any changing.

Any normal industrial electrical supplier should be able to provide a
transformer.

Ted Robbins.
----------

> From: mike grady <mgrady@...>
> To: CAD_CAM_EDM_DRO@onelist.com
> Subject: [CAD_CAM_EDM_DRO] electrical help needed: kinda ot
> Date: Monday, June 14, 1999 6:28 PM
>
> From: mike grady <mgrady@...>
>
> there is a lot of electrical/electronic knowledge on this list
> so I thought I would ask here
> I have a hardinge hct chucker that is 440v 3 ph
> hardinge recommended using a transformer to convert it to
> 220 instead of rewiring the control box
> on 440 it uses no more than 4 amps
> where can i get a transformer, hopefully cheap
> It mite get converted to cnc but I have to get it running first
>
> thanks
> mike
>
>
>
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