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Alternator Issue

 
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mhealydds



Joined: 17 May 2015
Posts: 24
Location: Wichita, KS

PostPosted: Mon Oct 23, 2017 5:25 am    Post subject: Alternator Issue Reply with quote

Trouble shooting question for you all...I am having some alternator issues. I have the 60 amp PP alternator that comes with FF kit form Vans. I have about 75 hours on plane. My alternator works fine on ground and charges in 13.4 to 13.6 range, but when I am in the air in stays around 12.5 charge rate. It has has been doing that for about last 20 hours. It had a whine with RPM increase. I did some looking with multi meter and reading seemed to consistent throughout system and on both EFIS screen (AF-5000). Out of pure laziness more than anything I swapped for a brand new alternator - same result. Works fine on ground but low charge rate in flight and sometimes with go down to 12.0 volts. I recycle field switch and will sometimes get back up into 13s but doesn't stay. On side note I have a back-up PP 30 amp alternator on vacuum pad that works as it should. Any thoughts?

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Kellym



Joined: 10 Jan 2006
Posts: 1464
Location: Sun Lakes AZ

PostPosted: Mon Oct 23, 2017 5:36 am    Post subject: Alternator Issue Reply with quote

Send your question to the aeroelectric-list. Many experts there.
aeroelectric-list(at)matronics.com

I have same alternator, and I normally get 14.3-14.4 in flight once the
battery has recovered from starter current draw.

On 10/23/2017 6:25 AM, mhealydds wrote:
Quote:


Trouble shooting question for you all...I am having some alternator issues. I have the 60 amp PP alternator that comes with FF kit form Vans. I have about 75 hours on plane. My alternator works fine on ground and charges in 13.4 to 13.6 range, but when I am in the air in stays around 12.5 charge rate. It has has been doing that for about last 20 hours. It had a whine with RPM increase. I did some looking with multi meter and reading seemed to consistent throughout system and on both EFIS screen (AF-5000). Out of pure laziness more than anything I swapped for a brand new alternator - same result. Works fine on ground but low charge rate in flight and sometimes with go down to 12.0 volts. I recycle field switch and will sometimes get back up into 13s but doesn't stay. On side note I have a back-up PP 30 amp alternator on vacuum pad that works as it should. Any thoughts?




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lschneider39(at)cox.net
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PostPosted: Mon Oct 23, 2017 7:01 am    Post subject: Alternator Issue Reply with quote

Be sure the belt is tight

Quote:
On Oct 23, 2017, at 6:25 AM, mhealydds <mhealydds(at)gmail.com> wrote:



Trouble shooting question for you all...I am having some alternator issues. I have the 60 amp PP alternator that comes with FF kit form Vans. I have about 75 hours on plane. My alternator works fine on ground and charges in 13.4 to 13.6 range, but when I am in the air in stays around 12.5 charge rate. It has has been doing that for about last 20 hours. It had a whine with RPM increase. I did some looking with multi meter and reading seemed to consistent throughout system and on both EFIS screen (AF-5000). Out of pure laziness more than anything I swapped for a brand new alternator - same result. Works fine on ground but low charge rate in flight and sometimes with go down to 12.0 volts. I recycle field switch and will sometimes get back up into 13s but doesn't stay. On side note I have a back-up PP 30 amp alternator on vacuum pad that works as it should. Any thoughts?




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http://forums.matronics.com/viewtopic.php?p=473795#473795











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philperry9



Joined: 23 Nov 2011
Posts: 330

PostPosted: Mon Oct 23, 2017 7:30 am    Post subject: Alternator Issue Reply with quote

On the topic of belt slipping, here's the spec and procedure to test.  Mine loosened greatly after the first 8-10 hours and required some attention.

https://www.lycoming.com/sites/default/files/SI1129D%20Alternator%20Belt%20Tension%2C%20Methods%20of%20Checking.pdf

Phil


On Mon, Oct 23, 2017 at 9:48 AM, Larry Schneider <lschneider39(at)cox.net (lschneider39(at)cox.net)> wrote:
Quote:
--> RV10-List message posted by: Larry Schneider <lschneider39(at)cox.net (lschneider39(at)cox.net)>

Be sure the belt is tight

> On Oct 23, 2017, at 6:25 AM, mhealydds <mhealydds(at)gmail.com (mhealydds(at)gmail.com)> wrote:
>
> --> RV10-List message posted by: "mhealydds" <mhealydds(at)gmail.com (mhealydds(at)gmail.com)>
>
> Trouble shooting question for you all...I am having some alternator issues. I have the 60 amp PP alternator that comes with FF kit form Vans. I have about 75 hours on plane. My alternator works fine on ground and charges in 13.4 to 13.6 range, but when I am in the air in stays around 12.5 charge rate. It has has been doing that for about last 20 hours. It had a whine with RPM increase. I did some looking with multi meter and reading seemed to consistent throughout system and on both EFIS screen (AF-5000). Out of pure laziness more than anything I swapped for a brand new alternator - same result. Works fine on ground but low charge rate in flight and sometimes with go down to 12.0 volts. I recycle field switch and will sometimes get back up into 13s but doesn't stay. On side note I have a back-up PP 30 amp alternator on vacuum pad that works as it should. Any thoughts?
>
>
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=473795#473795
>
>
>
>
>
>
>
>
>


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Lenny Iszak



Joined: 23 Mar 2008
Posts: 235

PostPosted: Mon Oct 23, 2017 8:00 am    Post subject: Alternator Issue Reply with quote

It might be an AFS issue. I have two 5800s and one of them was giving me low voltage alarms, getting down to 11.5 or so, the other stayed rock solid displaying 14.1. It only did it once on a longer flight, and it didn’t happen again. So, it may not be alternator related. Check the logs on both Efis screens.
PP alternators have a whine especially at a higher load, because they have switching regulators. If I knew that before I would have installed a B&C which has an external linear voltage regulator, producing much less noise. Interestingly I don’t hear the noise with the Halo headset, but I do with the Bose A20.

Lenny
Quote:
On Oct 23, 2017, at 9:25 AM, mhealydds <mhealydds(at)gmail.com> wrote:



Trouble shooting question for you all...I am having some alternator issues. I have the 60 amp PP alternator that comes with FF kit form Vans. I have about 75 hours on plane. My alternator works fine on ground and charges in 13.4 to 13.6 range, but when I am in the air in stays around 12.5 charge rate. It has has been doing that for about last 20 hours. It had a whine with RPM increase. I did some looking with multi meter and reading seemed to consistent throughout system and on both EFIS screen (AF-5000). Out of pure laziness more than anything I swapped for a brand new alternator - same result. Works fine on ground but low charge rate in flight and sometimes with go down to 12.0 volts. I recycle field switch and will sometimes get back up into 13s but doesn't stay. On side note I have a back-up PP 30 amp alternator on vacuum pad that works as it should. Any thoughts?




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Lenny Iszak
Palm City, FL
2014 RV-10, N311LZ - 300 hrs
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Bob Turner



Joined: 03 Jan 2009
Posts: 797
Location: Castro Valley, CA

PostPosted: Mon Oct 23, 2017 12:44 pm    Post subject: Re: Alternator Issue Reply with quote

I’d start by looking at the field circuit. Any chance that switch is failing in flight? Or another connection?

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maca2790



Joined: 26 Jan 2011
Posts: 40
Location: Australia

PostPosted: Mon Oct 23, 2017 1:18 pm    Post subject: Alternator Issue Reply with quote

Hi everyone,
If the Bus Voltage is falling to 12.5 Volts in Flight then the Battery is
not being charged at all! These Batteries
require more than 13.2 Volts to reach a full charge. The usual output
voltage is 14.1 to 14.2 volts so as to overcome
the internal resistance of the battery and to push some current through the
battery to allow charging to take place.

Yes check the belt tension as has been suggested. Check the Field connection
and the connections on the output
side.
As for the Voltage regulator the voltage regulator is a linear regulator
that is integral to the Brush Assembly.
If there is noticeable whine it could be being caused by blown diodes in the
rectifier pack. That will also
affect the output voltage.

You mention you have the PP 30 back up. If you normally leave the field
breaker/switch on that Alternator will
provide output when the bus voltage falls below 13 volts. So you might only
be looking at what is being supplied by the
PP30.
I have the same setup on my RV10 and when I first start up, I don't turn Alt
1 on until I have checked that
Alt 2 (PP30) is supplying current on the Alternator 2 input on my AFS4500
MFD. It will usually show around 6 to 8 amps of
Charging current right after starting. Once that is checked, I turn Alt 1 on
and the charging rate will then jump up
To around 20 amps on the Alt 1 sensor and Alt 2 will show zero.
Cheers

John MacCallum
VH-DUU
RV 10 # 41016



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