nuckolls.bob(at)aeroelect
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 Posted: Mon Sep 24, 2018 2:10 pm Post subject: What to monitor in a dual alternator airplane |
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| Quote: | If you have both set at the same voltage, they are both theoretically
operating and you will not be able to tell if one fails. |
Which is why simultaneous operation of two alternators
has never been recommended in the 'Connection.
I designed a regulator for the Cessna 303 to parallel
two alternators but it was fussy and they abandoned
the idea in favor of the single regulator driving
two alternators idea used on the 336/337 series
aircraft.
By operating only one at a time, failure of the active
alternator is immediately annunciated by the LOW VOLTS
warning light whereupon crew positioning of a few switches
mitigates the condition.
Except for starter-generators on turbine twins, we
almost never run two engine driven power sources
to the same bus. Z-14 is an example of dual alternator/
dual battery system that purposefully separates
them into independently operated systems that
can share energy under certain circumstances:
One alternator failed and during engine cranking.
All other times, it's better to have them separate
with active notification of low volts for each
system.
Simpler, less expensive and much better FMEA
outcome.
Bob . . .
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