Re: Power Supply Basics - Question

--- In CAD_CAM_EDM_DRO@yahoogroups.com, John Johnson <johnatl@m...>
wrote:

> If you connect them in series, you get 40v @ 2.5 amps. If you

connect

> them in parallel, you get 20v at 5 amps. If you can use 48v, you

can go

> here: http://mpja.com/listitems.asp?dept=45 and get two 24v
> transformers,

MPJA, P/N: LP520

center tap, 10 amps.

You can wire one for 24VAC, the other for 12VAC and get 36V.
I'm not sure if you get 10 amps regardless how you wire.

Also, reduce by 1/3, not use 1/3 total amps.

Therefore for 4 motors you would want to use 12 amps total, so this
would be a simple way for a 3 axis.

Leave room for the other 2 tranformers and cap if you plan on
expanding in the future. Another option is to have a seperate power
supply for the 4th axis. That way it is totally portable between
machines.


Dave








or a 24v and a 12v for 36v. If you've got the money, you

> can go to http://www.digikey.com/, search for transformer, and use
> their parametric search to find the one you want. Try the

toroidals,

> there are more of those.
>
> On Thursday, December 18, 2003, at 11:21 AM, jharnedy@e... wrote:
>
> >
> > Hi list,
> >
> > Hooking up G201s to SanyoDenki 103 H 8221 – 5141
> > Motor specs Vdc = 2.4, Phase current 4 amps
> >
> > Per Gecko white paper, 25 times voltage = 60 Vdc, hence divide

by

> > 1.414 => 42 Vac
> >
> > Current is 1/3 per motor (4 wire, bipolar), so for 3 motors PS

output

> > needs 4 amps
> >
> > If 4 axis, then 4 motors => 5.3amps
> >
> > Hope above logic is correct, if not please highlight errors!
> >
> > Have been looking around for 42Vac output, and best i can find is

a

> > 230Vac transformer with 2 independent secondaries, both rated at

20

> > Vac @ 2.5 amps ( part no RS 805-300 ). Can i hook these up in

series

> > to get 40Vac @ 5 amps?
> > If so, will there be any issues with using just 3 motors (the 4th

may

> > not be connected up until i can get my head around how to design

the

> > fourth axis economically!)
> >
> > TIA
> > John
> >
> >
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