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                           AeroElectric-List Digest Archive
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                     Total Messages Posted Fri 01/28/22: 1
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Today's Message Index:
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     1. 09:55 PM - Re: Re: Why CB on regulator field supply?  (Robert L. Nuckolls, III)
 
 
 
________________________________  Message 1  _____________________________________


Time: 09:55:54 PM PST US
From: "Robert L. Nuckolls, III" <nuckolls.bob@aeroelectric.com>
Subject: Re: AeroElectric-List: 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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