Re: [CAD_CAM_EDM_DRO] Re: CNC power supply question

If you use a contactor to turn the power supply on just have an extra
contact normally closed, to apply the resistor when power is removed. It
saves power and the resistor wattage doesn't, need to be as high.
Jim

----- Original Message -----
From: "bull2002winkle" <bull2002winkle@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Monday, March 08, 2004 12:38 AM
Subject: [CAD_CAM_EDM_DRO] Re: CNC power supply question


> The only thing I have not seen that you may want is a bleeder resistor
> across your filter capacitor to discharge it when power is turned off.
> The ideal value will depend on the voltage of your supply and the
> capacitance of the capacitor. A 500 ohm 10 watt resistor is a good
> start. There have been many posts about how to pick the right size
> bleeder but this will get you close.
>
> Ken
>
> --- In CAD_CAM_EDM_DRO@yahoogroups.com, "snagglexr650"
> <snaggletto@c...> wrote:
> > Hey,
> > Thanks for the great, informative replies. I'm learning alot, but
> > still have tons more to learn, especially on the electrical side.
> >
> > I've been looking at some of the extra 'features' you can add to
> > homemade PS's. For example, Mariss's capacitor bleed circuit, and
> > I've seen precharge circuits that limit the initial current when the
> > PS is first powered on like Mr. Fortune uses on his 1kw/1.5kw
> > monsters. These added features seem like they could almost be
> > considered essential even for smaller/less powerful supplies. What
> > other safety/component protection circuits are common for a full
> > featured power supply?
> >
>
>
>
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