Re: Bleeder resistor for power supply size?

I found some amazing hang time in my system. When I was running
only a transformer,bridge, and caps (no motors/drivers) I had
66VDC, shut down power and came back 48 hours later, it was only
down to 35VDC. With a pair of geckos and 1050oz steppers, it
bleeds down in about 10 seconds or so, entirely acceptable!

-Damon

--- In CAD_CAM_EDM_DRO@yahoogroups.com, JanRwl@A... wrote:
> In a message dated 7/6/2003 8:29:43 PM Central Standard Time,
> davemucha@j... writes:
>
> > Is there some pressing reason to drain the power ?
> >
> Dave and others on this thread: If the dozens who might "build
something",
> yet without a CLUE what electrons look like, are ALL very careful
not to TOUCH
> anything, then NO bleed, or let the LOAD perform that task is fine.
HOWEVER,
> if any of this same group of "dozens" ever do their own checkout,
repair, s
> howing-off, or "adding in something else not yet thunk of", they can
get a
> SURPRISE with even only 30 volts stored in a 15,000 µf and larger
cap! It will RUIN
> the tips of some nice tools, and leave "nasties" on otherwise brite,
shiny
> terminals or tops of transistors,etc.!
>
> Another "bleed" that is NO big deal, AND, will "show" what's going
on, is
> simply a good brite LED with the approp. resistor (figure it to
permit 15-20 mA
> to flow through the LED when power's on). This can REMIND you not
to go pokin'
> your shiny new tools about between terminals, and how long it will
be before
> the "dangerous juice" is sufficiently dissipated! It further acts
as your
> "Main DC" pilot-lamp! GOTTA have one of those anyway!
>
> Jan Rowland
>
>
> [Non-text portions of this message have been removed]