klehman(at)albedo.net
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 Posted: Fri Nov 03, 2006 4:59 am Post subject: Current limiter and/or Circuit breaker for alternator |
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Further explanation if required would be that yes an ANL is a slow
acting fuse and it is equivalent to a breaker. Certainly there is
nothing immediately wrong with having multiple devices in a circuit.
However both these devices add very small amounts of resistance to the
circuit as does the connections to them. Additional resistance could
lead to less voltage stability with some regulators, and more
maintanance as the system ages. In some cases you may also have a
battery contactor and an overvoltage contactor in that B-lead circuit.
The general idea is to keep the B-lead short and not run extra length up
to the instrument panel and then back to a battery. However a B-lead
breaker does not have to be on the panel and does not have to be
resettable in flight. Certainly an ANL would not be replaced in flight,
nor would you want to. Another reason to keep B-leads short is that they
tend to radiate some noise.
Since the ANL is protecting the B-lead from excess battery supplied
current, it makes sense to keep it close to the battery. As Bob has
expained on several occasions, contrary to first look, the purpose of
the ANL is definately not to protect anything from excess alternator
current.
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