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From: "Pat Ford"
Subject: Re: (Avionics) How can this circuit produce an "inductive surge"?
Date: Mon, 30 Sep 2002 14:00:32 -0400
Organization: National Research Council of Canada
NNTP-Posting-Date: 30 Sep 2002 18:00:25 GMT
X-Newsreader: Microsoft Outlook Express 5.50.4807.1700
Then there "shouldn't" be a load dump, just a bit of a kick from the field
"Peter" wrote in message
> "Pat Ford" wrote:
> > Why do they isolate the battery on shutdown?
> One doesn't normally (not on my checklist) isolate the battery on
> shutdown. Doing so would possibly make the alternator go unstable
> because it would be driving into a much higher impedance load
> (possibly a negative-impedance load, given that some of today's
> avionics contain wide input range switching power supplies).
> One disconnects all electrics (avionics) from the alternator+battery
> One also breaks the field current of the alternator.
> Apart from spikes from relays etc I am still not convinced there is a
> good reason for this procedure.
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