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mburbidg(at)gmail.com
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 Posted: Thu Jul 04, 2013 11:17 am Post subject: Master/Battery/Alt Field vs. Master/Battery and Alt Field... |
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I'm sure I read a discussion of this question somewhere but can't find it.
I'm building an RV-9A, basic day/night VFR. I'm using the Basic Day/Night VFR system diagram available from B&C website. It is almost identical to the Z-11 diagram in Bob's book. One difference is that the Z-11 uses a 2 poll 3-throw switch (2-10) for the master, so that the alternator can be switched on after start. The Basic VFR diagram from B&C uses a 2 poll 2 throw switch (2-3) so that the alternator field is on during start.
What are the advantages of isolating the alternator field during startup? My airplane has a B&C 40 amp alternator. Which approach would you recommend?
Thanks,
Michael-
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user9253
Joined: 28 Mar 2008
Posts: 1928
Location: Riley TWP Michigan
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| Posted: Fri Jul 05, 2013 6:51 pm Post subject: Re: Master/Battery/Alt Field vs. Master/Battery and Alt Fiel |
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| Quote: | | One difference is that the Z-11 uses a 2 poll 3-throw switch (2-10) for the master, so that the alternator can be switched on after start. |
Wired per Z-11, the alternator could be switched off during start, but I do not think that is the intent or common usage. I would start the engine with the alternator field turned on. There are some situations when it is desirable to shut the alternator field off. One situation is parked on the ground with the engine off and battery contactor on. Another situation is when the charging system malfunctions in the air.
Joe
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