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amekler
Joined: 07 Oct 2010
Posts: 164
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 Posted: Sun Nov 23, 2014 4:05 pm Post subject: volts dropped from 14.4 to 1 |
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I have AFS 4500 in my RV10.Today I took a short 30 min local flight. Taxing in I got a check volts audio alert. The volts suddenly dropped from the usual 14.4 to basically zero. See below in the upper graph in yellow (volts ) at 29 minutes. If the alternator quit I should read the battery voltage not 0.
Any ideas on what to check?
Alan
N668G 300 hrs[img]cid:293F73EE-410A-40DA-90C3-76AC66995E69[/img]
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Kellym
Joined: 10 Jan 2006
Posts: 1705
Location: Sun Lakes AZ
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| Posted: Sun Nov 23, 2014 4:21 pm Post subject: volts dropped from 14.4 to 1 |
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Probably a failure at the battery ground, or master relay solenoid.
You are right that alternator failure would not cause you to go below
battery volts.
Do you have battery backup on your EFIS or did it also quit at that point?
On 11/23/2014 5:02 PM, Alan Mekler MD wrote:
| Quote: | I have AFS 4500 in my RV10.
Today I took a short 30 min local flight. Taxing in I got a check
volts audio alert. The volts suddenly dropped from the usual 14.4 to
basically zero. See below in the upper graph in yellow (volts ) at 29
minutes. If the alternator quit I should read the battery voltage not 0.
Any ideas on what to check?
Alan
N668G 300 hrs
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Kelly McMullen
A&P/IA, EAA Tech Counselor # 5286
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jesse(at)saintaviation.co
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| Posted: Sun Nov 23, 2014 4:39 pm Post subject: volts dropped from 14.4 to 1 |
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It could be the breaker/circuit that supplies the voltage sensing has popped. I'm not sure on that unit if it is the power supply line to the EFIS or if it is a separate voltage only line, in which case that wire could be broken or could have been cut or shorted to ground.
Jesse Saint
I-TEC, Inc.
jesse(at)itecusa.org
www.itecusa.org
www.mavericklsa.com
C: 352-427-0285
O: 352-465-4545
F: 815-377-3694
Sent from my iPhone
| Quote: | On Nov 23, 2014, at 7:02 PM, Alan Mekler MD <amekler(at)metrocast.net> wrote:
I have AFS 4500 in my RV10.
Today I took a short 30 min local flight. Taxing in I got a check volts audio alert. The volts suddenly dropped from the usual 14.4 to basically zero. See below in the upper graph in yellow (volts ) at 29 minutes. If the alternator quit I should read the battery voltage not 0.
Any ideas on what to check?
Alan
N668G 300 hrs<Screen Shot 2014-11-23 at 5.19.13 PM.png>
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| | - The Matronics RV10-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:
http://www.matronics.com/Navigator?RV10-List |
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amekler
Joined: 07 Oct 2010
Posts: 164
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| Posted: Sun Nov 23, 2014 4:39 pm Post subject: volts dropped from 14.4 to 1 |
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Kelly,
I noticed no changes in the EFIS. They have backup battery. It was a sudden failure as you can see.
Alan
| Quote: | On Nov 23, 2014, at 7:17 PM, Kelly McMullen <kellym(at)aviating.com> wrote:
Probably a failure at the battery ground, or master relay solenoid.
You are right that alternator failure would not cause you to go below battery volts.
Do you have battery backup on your EFIS or did it also quit at that point?
On 11/23/2014 5:02 PM, Alan Mekler MD wrote:
> I have AFS 4500 in my RV10.
> Today I took a short 30 min local flight. Taxing in I got a check volts audio alert. The volts suddenly dropped from the usual 14.4 to basically zero. See below in the upper graph in yellow (volts ) at 29 minutes. If the alternator quit I should read the battery voltage not 0.
> Any ideas on what to check?
> Alan
> N668G 300 hrs
>
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amekler
Joined: 07 Oct 2010
Posts: 164
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| Posted: Sun Nov 23, 2014 4:48 pm Post subject: volts dropped from 14.4 to 1 |
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Jesse,
I’ll check with Rob at AFS.
Alan
| Quote: | On Nov 23, 2014, at 7:33 PM, Jesse Saint <jesse(at)saintaviation.com> wrote:
It could be the breaker/circuit that supplies the voltage sensing has popped. I'm not sure on that unit if it is the power supply line to the EFIS or if it is a separate voltage only line, in which case that wire could be broken or could have been cut or shorted to ground.
Jesse Saint
I-TEC, Inc.
jesse(at)itecusa.org
www.itecusa.org
www.mavericklsa.com
C: 352-427-0285
O: 352-465-4545
F: 815-377-3694
Sent from my iPhone
> On Nov 23, 2014, at 7:02 PM, Alan Mekler MD <amekler(at)metrocast.net> wrote:
>
> I have AFS 4500 in my RV10.
> Today I took a short 30 min local flight. Taxing in I got a check volts audio alert. The volts suddenly dropped from the usual 14.4 to basically zero. See below in the upper graph in yellow (volts ) at 29 minutes. If the alternator quit I should read the battery voltage not 0.
> Any ideas on what to check?
> Alan
> N668G 300 hrs<Screen Shot 2014-11-23 at 5.19.13 PM.png>
>
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tfarrell839
Joined: 10 Nov 2012
Posts: 27
Location: Watsonville, CA
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| Posted: Sun Nov 23, 2014 5:02 pm Post subject: volts dropped from 14.4 to 1 |
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I just peeked at the wiring diagrams.
eFIs Expansion cable Pin 13 is labels as Volts2, but I don't see a volts1 anywhere. There are two power inputs into the main connector. It is possible that one of them monitors voltage and one doesn't. Possibly one of the came loose. Call advanced and they'll have the answer quickly.
Sent from my iPhone
| Quote: | On Nov 23, 2014, at 4:02 PM, Alan Mekler MD <amekler(at)metrocast.net> wrote:
I have AFS 4500 in my RV10.
Today I took a short 30 min local flight. Taxing in I got a check volts audio alert. The volts suddenly dropped from the usual 14.4 to basically zero. See below in the upper graph in yellow (volts ) at 29 minutes. If the alternator quit I should read the battery voltage not 0.
Any ideas on what to check?
Alan
N668G 300 hrs<Screen Shot 2014-11-23 at 5.19.13 PM.png>
|
| | - The Matronics RV10-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:
http://www.matronics.com/Navigator?RV10-List |
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Tim Farrell
Aircrafters
831-722-9141 |
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