nuckolls.bob(at)aeroelect
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 Posted: Thu Aug 02, 2012 7:15 pm Post subject: PM Alternator filter Capacitor - best practices |
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At 10:55 AM 8/2/2012, you wrote:
So should the capacitor and 1K resistor be deleted from Z13/8 ?
Don't delete anything. We're having a discussion
about the notion that data gathered on an SD-8 with
a 'scope about 10 years ago doesn't confirm legacy
beliefs about what a capacitor across a power supply
does for us.
This capacitor MAY have some value in fast, low
energy transient mitigation and/or regulation
dynamics. John and I will continue to ponder
"out loud on the List" but don't take any
hypothesis as cause to rise up and evict
your capacitor.
The capacitor AND 1K resistor are also participants
in the self excitation system.
Note 20 indicates the purpose of the capacitor is to smooth the
voltage if the battery is offline. However, there is no intentional
way of disconnecting the battery, and there are very few failures
that could result in the battery being disconnected while the SD-8
still remains connected to the battery bus.
In Z13/8 the SD-8 is only turned on in the event of a main alternator
failure. Maybe in this circumstance, a little noise in the audio is
not significant to the completion of the flight (assuming the
capacitor actually helps in a given installation).
Good questions/suppositions all . . . we'll
endeavor to sort it out with greater
clarity.
Bob . . .
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