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JOHN TIPTON
Joined: 17 Sep 2006
Posts: 239
Location: Torquay - England
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 Posted: Thu May 01, 2014 7:56 am Post subject: Basic VFR system |
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Hi Guys/Bob
I'm thinking now about the wiring for the RV9a, requirements are 'basic' VFR, and looking at Z-11, is not basic enough, so have ventured to B & C for their basic VFR diagram
http://www.bandc.biz/pdfs/001510VFRSingleALT.pdf
The only thing I see here that I havn't seen on any other (Z-xx) diagram, is the extra ANL from the Battery to Main Bus, between the contacter (items 9 &10) and main bus is a ANL fuse.
Can someone expand on the theory for this item where it is, but not generally found.
Best regards
John
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gyoung
Joined: 09 Jan 2006
Posts: 211
Location: Republic of Texas
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| Posted: Thu May 01, 2014 9:49 am Post subject: Basic VFR system |
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I'm used to seeing the big fuse in the B lead to protect against a runaway alternator. But the other one between the battery and main bus seems redundant. The only thing I see it protecting is a direct short of the bus bar. Anything attached to the bus is protected by its own fuse/cb. I'm also interested to know if there's another purpose.
BTW, if you want Bob to chime in then post it to the Aeroelectric list.
Regards,
Greg Young
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jluckey(at)pacbell.net
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| Posted: Thu May 01, 2014 10:57 am Post subject: Basic VFR system |
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John,
The purpose of the current limiter is to protect the feeder that goes from the Master relay/solenoid to the main bus. It does not have anything to do w/ the alternator in that location.
The drawing does show another ANL in the output of the alternator, however it would not be good protection against a runaway alternator. This is because it would require at least 150% overload for several seconds (you would have to look at the current curve in the spec sheet for that ANL for exact numbers of time vs % overload).
By the time the ANL popped, the buss voltage would have been unacceptably high for too long and very likely cooking electrical components. The ANL in the B lead is to protect it from ground faults.
To prevent damage from a runaway alternator you should use an Overvoltage Protection Module which will shut-down an errant alternator in less than a second.
In what part of the country are you located?
-Jeff Luckey
From: "bigdog(at)bentwing.com" <bigdog(at)bentwing.com>
To: "avionics-list(at)matronics.com" <avionics-list(at)matronics.com>
Sent: Thursday, May 1, 2014 10:48 AM
Subject: RE: Basic VFR system
--> Avionics-List message posted by: "bigdog(at)bentwing.com (bigdog(at)bentwing.com)" <bigdog(at)bentwing.com (bigdog(at)bentwing.com)>
I'm used to seeing the big fuse in the B lead to protect against a runaway alternator. But the other one between the battery and main bus seems redundant. The only thing I see it protecting is a direct short of the bus bar. Anything attached to the bus is protected by its own fuse/cb. I'm also interested to know if there's another purpose.
BTW, if you want Bob to chime in then post it to the Aeroelectric list.
Regards,
Greg Young
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