> >I'm not a fan of the above fuseology methods.
> >I would hope to reduce any glitch events to
> >a much smaller amount of time.
> I'd rather have no event at all, but that's
> not realistic.
Like owners of aircraft with retractable landing
gear. The question is not "if" or "why", but when
the pilot will land with the gear still up.
> I don't see how 10 seconds or so of uncontrolled
> charge is going to push up a large lead acid
> battery's voltage much at all, before it
> pops the fuse.
Much of what happens directly relates to the
battery condition and the charging circuit. Old
tired & dry batteries may not draw enough current
to pop a fuse (or trip a breaker). Astron relies
on a narly scr to crowbar the main fuse/breaker.
The earlier ps regulator board and crowbar
circuit was problematic. The crowbar did fire
during regulator failures and glitch events...
saving both the equipment owner and Astron's
bacon many times through the years.
Sometimes the first version Astron crowbar circuit
fired because it wanted a cup of coffee (decafe
with cream) or it didn't like the color of your
shirt that day. Go figure... :-)
> >Don't know what world you're living in... My
> >ganged set of high current supplies at full
> >unregulated tilt will take out an 8D size
> >battery faster than I can drive to the site
> >to shut the supplies off.
> >I don't care to admit why I know the above...
> And a properly sized fuse would have stopped this.
Not if the battery impedance was high enough to
simply boil the battery dry. (ie... tired or dry
batteries).
> >After the battery boils out, the terminal voltage
> >rises pretty fast.
> The whole point is to NOT GO HERE.
One would hope... but batteries at remote locations
don't seem to always play fair. Doesn't take an over
current condition to make a dry or high impedance
battery.
> > Used DOA Astron Supplies pop at the flea markets
> >pretty regular. DOA supplies are actually
> >a lot of fun to fix.
> They certainly have an odd following.. I agree they
> are very poorly designed, yet they seem to be the
> first choice.. Kind of like PIC processors.
.... Replace the regulator board with an updated version
and clean up some of the sloppy assembly.... you've
got a pretty good low cost high current consumer grade
DC power supply.
(I'm a fan of embedded processor systems)
cheers,
skipp
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