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jcohen@post.com
Joined: 10 Mar 2022
Posts: 17
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 Posted: Thu Jun 08, 2023 6:26 am Post subject: Z101 switch state question: engine and main bus shutdown |
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I am implementing Z101 on my electrically dependent RV7 with a Lycoming IO360 engine, SDS EFII. I have a very basic question regarding operating states and switches. It may be stupid, so help me out. Here goes....
1. To shut the engine down, I was assuming I would turn the engine bus alt feed relay to off, then turn the master to off and the engine stops. But, wouldn't the primary alternator still keep supplying power to the engine bus and main bus, even without the battery in the loop, as it can supply power to energize its own field once running, without the master switch? So in effect nothing appears to happen?
2. IF #1 above is correct, should the best procedure for engine shutdown be turn off both electric fuel pumps first, and/or turn off both Ignition Coils (Top and Bottom), then turn off the engine bus alt feed switch and the Master switch to OFF?
3. And how do I turn off the main bus in flight but keep the engine running? If I am correct, turning the master off doesn’t de-power the main bus. Should the emergency procedure to get the main bus off in-flight for Z101, e.g. an electrical fire but keep the engine running, is to pull the alternator field circuit breaker along with the Master switch to off?
I am probably confused; most of this question centers on: Why couldn’t the primary alternator keep working even with the master off and battery out of the loop? Not sure I like the idea of having the main bus stay alive even when the master is off with the engine running.
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jcohen@post.com
Joined: 10 Mar 2022
Posts: 17
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| Posted: Thu Jun 08, 2023 7:06 am Post subject: Re: Z101 switch state question: engine and main bus shutdown |
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Oops, never mind, I discovered my own mistake. When the master is off, the pri alt field cannot get power from anything, as the bus voltage into the LR-3 regulator is zero.
Sorry for my confusion!
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