nuckolls.bob(at)aeroelect
Guest
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 Posted: Fri Dec 05, 2008 6:15 am Post subject: Does the Alternator shut down if battery power is removed? |
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At 05:41 PM 12/3/2008, you wrote:
| Quote: |
Given an alternator and an LR3 controller, with the engine running,
will the alternator shut down if the battery master is switched off?
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Not if you simply shut off the battery. Few airplanes are
wired with separate battery and alternator switches. The vast
majority of alternators on aircraft are wired with some form
of interlocking between battery master and alternator controls
to prevent alternator operation without the battery.
See:
http://aeroelectric.com/articles/Progressive-Xfr_Split-Rocker_Switches.pdf
http://www.aeroelectric.com/articles/Rev11/AppZ_R11M.pdf
http://www.aeroelectric.com/articles/Alternators/Know_Your_Charging_System.pdf
| Quote: | I'm guessing that the alternator will continue to function normally
since it's still self-exciting the field line. Shutting down the
alternator would require pulling the field breaker.
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Not if you wire it per the recommendations in Appendix Z
cited above (which is consistent with legacy alternator
installations on most certified aircraft). In any case,
your alternator field current should be controllable by some
switch whether independent of the battery master (al la Bonanza/
Baron) or ganged with the battery switch.
| Quote: | Is that correct?
Thanks
Bill Watson
RV10 with a Z-14
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If you're wired per Z-14 as published then your alternator
is controlled by the DC Power Master switch. Down is all power
OFF, mid position is BAT ON only, up position is BAT+ALT.
Bob . . .
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( . . . a long habit of not thinking )
( a thing wrong, gives it a superficial )
( appearance of being right . . . )
( )
( -Thomas Paine 1776- )
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