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1. 09:55 PM - Re: Re: Why CB on regulator field supply? (Robert L. Nuckolls, III)
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| Subject: | Re: Why CB on regulator field supply? |
At 06:34 PM 1/27/2022, you wrote:
Whenever any circuit breaker pops, it is best to wait until safely on
the ground before resetting or troubleshooting.
yeahhhh . . . mostly . . .
Circuit breakers can trip due to over current
(soft fault)
or short circuits
(hard fault)
or from loose wire terminals that make heat . .
(terminal on the breaker itself? probably
not . . . you'd have to conduct a LOT of
loose-joint, heat-energy into the breaker
to trip it's bi-metal current sense mechanism)
The best indicator of charging system failure is a voltmeter
showing low voltage (less than 13.5VDC).
Yes, but this discussion was about the SPECIAL
CASE for a DELIBERATE hard fault generated
by a crowbar ov management system. In this
case, it's possible that the ov trip was
a nuisance event so resetting this breaker
ONE time is called for. A short interval
re-trip is probable cause that the ov
condition is real.
The last generation of crowbar ov modules
were much more resistant to the dv/dt
transient . . . a number of my readers
have reported satisfactory operations with
just a fuse on the alternator field supply
feeder. If I resurrect this product, it will
probably be 100% immune to such stimuli.
Bob . . .
Un impeachable logic: George Carlin asked, "If black boxes
survive crashes, why don't they make the whole airplane
out of that stuff?"
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