Re: What have I got ?

Thanks Jon and Jan,

I think at my current level of experiance it is much easier to put
them aside for some future project.

I plan on running things on a hydro elec one day with wind and hot
water as additional utility supplies. maybe one day in the far off,
I can use them.

If anybody has any reasons why I might want to use them for a CNC
power supply, please let me know. I'd like to keep this on topic.

Seems that I've gotten some overkill in the units as I only run 4
NEMA34 single stacks. about 9amps total for 4 steppers.

Dave

--- In CAD_CAM_EDM_DRO@y..., Jon Elson <elson@p...> wrote:
>
>
> turbulatordude wrote:
>
> >I was lucky ?? enought to pick up a very heavy power supply from a
> >print shop.
> >
> >The unit has three items that look like transformers.
> >
> >two have a center sections 4.25" x 2.25" x 4" so you can imagine
the
> >overall size. The third is a smaller unit.
> >
> >here is where it gets funny. one big and the smaller of these
> >puppies only has 2 wires.
> >
> >I think that the unit was to power a lamp for exposing film.
> >
> >would I be correct in assuming that what I have are a couple
rather
> >large inductors ?
> >
> With only 2 wires, that is almost a certainty.
>
> >Luckily, the third unit is a transformer. I need to do some
testing
> >to see what ratios it has.
> >
> >IF the large unit is an inductor(choke?) does it have any value in
a
> >power supply ? or anything else for that matter ?
> >
> >
> Yes, it might. Capacitor-input filters have good 'regulation', ie.
the
> output voltage
> stays pretty constant with reasonable current change, but they are
real
> hard on the
> rectifiers, pulling sharp bursts of high current at the line
voltage
> peaks. This gives
> them a rotten power factor.
>
> Inductor-input filters have worse regulation, but they tend to draw
> nearly constant
> current from the line, giving them a somewhat better power factor.
A
> combination
> of just the right inductor and capacitor can draw an excellent
power
> factor from the
> line, allowing you to get the most watts form a particular size
wire and
> breaker
> amperage.
>
> But, in general, you just don't want to fool with things at this
level
> of complexity, until
> the power levels get into the several KW range, at least. People
who
> want to charge
> electric cars from the wall socket, for instance, get involved in
this
> sort of thing.
>
> Jon