Re: power supply

Mike,
I have one as described by Jon. Its yours for $30 plus shipping if
you want it. Its a 1KVA+ 240/208 can be used for 120/104. Heavy
guage wiring. Unused, about 4" cube as described. Its just sitting on
my shelf now. I ended up making an autoformer from some monster
transformers that came with my mill. This one I bought to observe how
they are made. I could have used it in my app, but I'm a glutton for
punishment and had to try hand winding for the experience.

-Lee

--- In CAD_CAM_EDM_DRO@y..., Jon Elson <elson@p...> wrote:
> Mike Snodgrass wrote:
>
> > Bummer! it seemed like a good one. Is there another way to trim
the
> > voltage other than huge , hot, nasty, power resistors or bulky
variac?
>
> Power resistors will not "trim the voltage", either. They will
cause a voltage drop
> that varies with current draw.
>
> There are voltage adjusting transformers (usually autotransformers)
available for
> converting 208 - 240 and 240 - 208. These are often used to run
240 V
> air conditioners, or other mid-size motors, in locatins where
120/208 3-phase
> power is the only thing available. You should be able to find them
at air
> conditioning parts shops and electrical contractor suppliers.
Because the core
> only needs to handle the difference Volt-Amps, these transformers
are quite
> small. About a 4" cube, weighing maybe 6 pounds. I don't think
they are
> expensive. I'll bet Grainger has them, too.
>
> You can cut your voltage to 86% of what it is without the
transformer.
> You'd wire the line input (either 120 or 240 V) to the terminals
marked
> 240 V and the power supply would be connected to the terminals
marked
> 208 V. If you were supplying 120 V to your transformer before, it
would
> now see 104 V. This should help bring your ~80 V down to 69 or so,
> safe for the Gecko.
>
> Jon