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Russell Duffy wrote:
Is there any way to control the PM alternator? In other words, can you turn
it off? Say you add one of these as a backup, and your normal alt is an ND or some
other type that can be turned on and off. As a part of pre-flight, you
could turn off the main alt, and verify that you still had charging voltage,
but would you ever be able to turn off the PM alt and verify that your main
alt was working? With the type of voltage alarm that many of us use, I
don't think you'd get a warning unless both alts were down. Cheers,
Rusty (I still like it though)
Rusty, a PM alternator won't experience the overvoltage problems of a standard one. The whole issue of controlling the field current (which controls the output) goes away. Instead, you'll get undervoltage until you get it up to rated RPM. The voltage warning lamp should be on the entire time your taxing, and go out when you rev the engine during the runup. If that isn't good enough, I'm sure Bill could easily throw in a disable switch to the regulator he'd design (see, Bill, I'm looking out for ya' 8*)
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