Re: [CAD_CAM_EDM_DRO] Re: loking for help with power supply for rutex drives...

----- Original Message -----
From: "ckhaun2000" <ckhaun@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Thursday, December 11, 2003 10:43 PM
Subject: [CAD_CAM_EDM_DRO] Re: loking for help with power supply for rutex drives...


> > Couple of other comments, you may want to include a mains filter on
> the input side of the transformer - this would protect against any short
> spikes etc on the mains.
> >
> > Use good quality caps with a high ripple current ripple rateing
> >
> > You may get away with a single mains transformer to drive all 3
> amps - as long as you
> > allow for a good current rateing, which should probably be rated at
> 20 Amps.
> >
> > Good luck
> >
> > Dave Fisher
> >
> >
> I am also a newbie here (long time lurker). My question is about the
> mains filter mentioned above. Are we talking a capacitor, or is it an
> actual item that can be bought. How would I determine the size I
> needed? Any other info about this would be great. I thought I was all
> ready to start building my supply. DOH! I am also retrofitting a
> Bridgeport clone (Tree).

The mains filter type I refer to can be bought as a sealed unit - normally
contains an RC network internally with ferrite cores etc, They are normally
between $10 to $25. They are nearly always rated at line voltage and get
larger depending on the amps (load) they can carrry. I suggested the use
to the previous poster as a belt and braces method, bit out of habit !!

They would not be a major benefit on a power supply that was JUST powering
servo motors - but would be more beneficial to 'clean up' AC line supplies that
end up powering DC supplies that power any kind of logic / computer circuitry.
In fact with our Rutex amps we use a totaly seperate PSU to operate the logic.

For the record, this type of low cost filter will not protect against ' Brown Outs'
or varying line voltages or high voltage transients.

Rgds

Dave Fisher

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