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user9253
Joined: 28 Mar 2008
Posts: 1922
Location: Riley TWP Michigan
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 Posted: Fri Jun 05, 2009 5:25 am Post subject: Essential Incident - Almost (Long)Essential Incident - Almos |
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Ed,
It is hard to improve on Bob Nuckolls wiring diagrams. His schematics have evolved and have been proven over time and have been scrutinized by many eyes. His essential bus is fed via two paths: a diode and a switch. If one path fails, there is a backup. Your intention of putting the diode back in is a good idea. The voltage drop across a diode is not a concern because the alternator is putting out more than enough voltage. If the alternator fails and you turn on the E-Bus alternate feed switch, the diode is no longer part of the circuit. So in either case, alternator working or not, the voltage drop across the diode is not a concern.
Putting another switch (E-Bus alt feed) between the battery and alternator introduces another failure point. That extra switch is not needed because there is already a master switch to shut off the battery and alternator circuits. Not only does the master switch shut off non-essential electrical loads, it also shuts off the main battery contactor, another non-essential load.
I assume that your E-Bus alternate feed switch is a double pole switch because it controls two things: the E-Bus and battery-to-main-bus circuit. If that switch fails, both electrical paths to the E-Bus could be lost.
If you post your electrical schematic on AeroElectric, others can offer suggestions for improvement.
Joe
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Ed Anderson
Joined: 10 Jan 2006
Posts: 475
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| Posted: Fri Jun 05, 2009 5:52 am Post subject: Essential Incident - Almost (Long)Essential Incident - Almos |
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I have to agree, Joe. What 10 years ago seemed like a reasonable idea and design– proved 10 years later to be in need of some changes – without doubt. While this incident was undoubtedly pilot induced – it pointed out some limitations that I had not factored in. Fortunately, I get the chance to make some changes.
Yes, in hindsight, I agree - the voltage drop across the diode is a minor factor in the scheme of things. However, the Alternator/ battery switch will stay in the circuit - because even diodes can fail. If the switch fails then hopefully the diode will keep the battery replenished. Should the diode fail then the switch provides a circuit for keeping battery alive. I will also revise the circuit so the Master relay is not solely dependent on battery voltage.
Back 10 years ago, it seemed to me that alternator failure was the highest probability. After 10+ years of flying without either alternator or battery failure – I am content with the basic design (after aforementioned changes are made that is {:>))
Ed
Ed Anderson
Rv-6A N494BW Rotary Powered
Matthews, NC
eanderson(at)carolina.rr.com
http://www.andersonee.com
http://www.dmack.net/mazda/index.html
http://www.flyrotary.com/
http://members.cox.net/rogersda/rotary/configs.htm#N494BW
http://www.rotaryaviation.com/Rotorhead%20Truth.htm[url=http://www.dmack.net/mazda/index.html][/url]
From: owner-aeroelectric-list-server(at)matronics.com [mailto:owner-aeroelectric-list-server(at)matronics.com] On Behalf Of Joe
Sent: Friday, June 05, 2009 9:23 AM
To: aeroelectric-list(at)matronics.com
Subject: Re: AeroElectric-List: Essential Incident - Almost (Long)Essential Incident - Almost (Long)
Ed,
It is hard to improve on Bob Nuckolls wiring diagrams. His schematics have evolved and have been proven over time and have been scrutinized by many eyes. His essential bus is fed via two paths: a diode and a switch. If one path fails, there is a backup. Your intention of putting the diode back in is a good idea. The voltage drop across a diode is not a concern because the alternator is putting out more than enough voltage. If the alternator fails and you turn on the E-Bus alternate feed switch, the diode is no longer part of the circuit. So in either case, alternator working or not, the voltage drop across the diode is not a concern.
Putting another switch (E-Bus alt feed) between the battery and alternator introduces another failure point. That extra switch is not needed because there is already a master switch to shut off the battery and alternator circuits. Not only does the master switch shut off non-essential electrical loads, it also shuts off the main battery contactor, another non-essential load.
I assume that your E-Bus alternate feed switch is a double pole switch because it controls two things: the E-Bus and battery-to-main-bus circuit. If that switch fails, both electrical paths to the E-Bus could be lost.
If you post your electrical schematic on AeroElectric, others can offer suggestions for improvement.
Joe
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[quote][b]
| | - The Matronics AeroElectric-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
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_________________
Ed Anderson
Rv-6A N494BW Rotary Powered
Matthews, NC
eanderson@carolina.rr.com |
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