Finn Lassen wrote:

> I think the +100 volts statement relates to no
battery load.  Have you > /anyone actually /seen/ that happen?  I guess if
the electrical system > was designed so that a contactor could disconnect
the battery from the > load circuits and the load circuits (avionics)
still be connected to > the alternator you would have a situation where
you could wave your > avionics goodbye.
> Perhaps.  But that wouldn't be very clever. Anyone who designed his > system to protect his avionics from a Battery over
voltage and ignored > the Alternator deserves whatever happens.
> Let's say on top of that that one (or all) of the
three retifiers > shorted out too, you'd have 100 volts A/C into
your avionics. Not a > pretty picture. (I've seen Zener diodes short out
regularily due to > overload/voltage; rectifier diodes usually fail
open - but not > always).   We're stretching a bit here aren't we? Back to the 100 V > that we've already agreed can't happen, shorted
diodes causing AC > (which I'm not at all sure can happen), all three
rectifiers (that's > all SIX diodes shorting at the same time (none of
them failing open > which is more common), zener failing, etc.  If a
diode fails every > 1000 hrs, the whole bank failing would happen
every 1000^6 hours.  > That's a one with TWENTY ONE zeros behind it.

I think I can live with that ... Jim S.

>
> Finn
>
> Jim Sower wrote:
>
>> <... the alternator is capable of producing over
100 volts ...>
>> I don't think so ...
>> ...
>> Bottom line, with the regulator failed (or
bypassed) to send full B+ >> voltage to the field, the charging voltage never
exceed 18V in my >> experience.
>
>
>
>
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