Re: Simple PSU stuff

And one of our resident Guru's, Mariss, has been good enough to put a
circuit in the files section that will monitor the voltage and when
you shut everything off, the circuit will kick in and reduce the
potential in the caps.

pretty slick.


I am not sure if I follow your question on fuseing the motor grounds.

your main power supply should be fused to the limit of your expected
amp load.

if you want to fuse each driver, follow the manufactureres
directions. if: Gecko's REQUIRE the addition of a 470uF cap on the
input terminals if there is a fuse inbetween the Gecko and PS.

Again, amp rating is total amp load plus whatever rounded up value
you need to get a stock fuse.

Dave




--- In CAD_CAM_EDM_DRO@yahoogroups.com, "Robert Campbell" <bob@c...>
wrote:

> The fan can act as the bleeder if it is a DC fan.
>
> If you are going to run the fan off the DC supply, you will need

to add a

> series dropping resistor. With 24 Volts ac into a bridge rectifier,

you will

> get about 33 volts DC output which will burn up the fan.
>
> Bob Campbell
>
> ----- Original Message -----
> From: <abbylynx@y...>
> To: <CAD_CAM_EDM_DRO@yahoogroups.com>
> Sent: Thursday, December 12, 2002 8:10 AM
> Subject: [CAD_CAM_EDM_DRO] Simple PSU stuff
>
>
> > Hello again Folks,
> >
> > I have a nice heavy toroidal transformer here, rated 160VA, with

two

> > windings of 12V @ 6.3A each, a 20A full-wave bridge rectifier

(100V

> > or 200V I think), and a big 50V 47,000uF capacitor. I'm going to

hook

> > the windings in series, to get 24V. I want to build a power-

supply,

> > but am wondering if I need to use bleeders on this? I'll also be
> > chucking a 24V fan onto the whole rig, so that should do the job

of

> > bleeders right?
> >
> > As for the load, it'll be 3 bipolar drive 2A, 3.2V stepper motors,
> > ala the type Sherline provide. Should be enough juice, no?
> >
> > The next question, what rating and type of fuse would be

recommended?

> > Should I put fuses on all the motors grounds, or would one single
> > one be sufficient?
> >
> > I know this is a repeat so some earlier posts, but I have been
> > looking for three days on/off and not been able to find the

original

> > message I was looking at. If I can get some good answers here,

I'll

> > make a nice li'l image and some info and splab it up on the file
> > section for all to see. :)
> >
> > Thanks
> >
> >
> >
> > Addresses:
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