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Subject: Re: (Avionics) How can this circuit produce an "inductive surge"?
Date: Mon, 30 Sep 2002 16:41:28 +0100
Organization: (Posted via) GTS Netcom.
NNTP-Posting-Date: Mon, 30 Sep 2002 15:35:22 +0000 (UTC)
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"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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