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Z 16 Charging question

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wdaniell.longport(at)gmai
Guest

Posted: Sun Oct 17, 2021 3:56 pm Post subject: Z 16 Charging question

I have a Rotax 912 with a Z16 and Dynon Skyview

The ammeter sometimes ( defined as once every 25 flights)  goes off the chart to 60a. I get the red X over the instrument.  Then it comes back and goes down to normal and sits there at whatever loads I have on the system.  I have always assumed that this was a Dynon bug.

My Dynon has a shunt installed between the generator and the bus which measures the entire load normally rock steady at 7A or 8A when using the autopilot.  I also have an independant  hall effect sensor measuring amps on the fat wire to the battery.

Today I noticed on climb out that the hall effect sensor was showing battery charge oscillating from +1.7A to +2.5A - normally it is steady.  I switched off the alternator and the hall effect sensor showed steady -7A in agreement with the load shown on my dynon (7A).  (I turned around and landed immediately.)   Voltage is steady.

I checked the alternator as per https://pointsforpilots.blogspot.com/2012/12/testing-rotax-912914-generator-and.html.   All within limits.

So my next steps are to change the regulator, which involves taking out the crowbar because the BandC had one internally,  (I had already bought a BandC voltage regulator some time ago) and the battery which is pretty much due for a change.

Any other thoughts?

Thanks

William Daniell



LONGPORT



+1 786 878 0246

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user9253

Joined: 28 Mar 2008
Posts: 1924
Location: Riley TWP Michigan

Posted: Mon Oct 18, 2021 3:32 am Post subject: Re: Z 16 Charging question

There is no way that a faulty regulator can make a Rotax dynamo put out 60 amps.

It is only capable of 20 amps or so.  There must be a bad connection somewhere.

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_________________
Joe Gores

wdaniell.longport(at)gmai
Guest

Posted: Mon Oct 18, 2021 4:25 am Post subject: Z 16 Charging question

JoeThanks.  Yes ...the first time it happened it caused a bit of worry until i realised i had no smoke in the cockpit...and everything was working normally.   And once id calmed down i came to the same conclusion.  I have to fault find that.

But what do you think of the fluctuating battery charging level?   Is that normal?   Or might it be the instrument?

Will



William Daniell

+1 786 878 0246



On Mon, Oct 18, 2021, 07:36 user9253 <fransew(at)gmail.com (fransew(at)gmail.com)> wrote:



 	  Quote: 	
		  --> AeroElectric-List message posted by: "user9253" <fransew(at)gmail.com (fransew(at)gmail.com)>

 

 There is no way that a faulty regulator can make a Rotax dynamo put out 60 amps.

 It is only capable of 20 amps or so.  There must be a bad connection somewhere.

 

 --------

 Joe Gores

 

 

 

 

 Read this topic online here:

 

 http://forums.matronics.com/viewtopic.php?p=503553#503553

 

 

 

 

 

 

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user9253

Joined: 28 Mar 2008
Posts: 1924
Location: Riley TWP Michigan

Posted: Mon Oct 18, 2021 7:45 am Post subject: Re: Z 16 Charging question

It is unlikely that the Skyview is at fault.  The vast majority of electrical problems are

caused by bad connections.  Take every related connection apart and reassemble.

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Joe Gores

wdaniell.longport(at)gmai
Guest

Posted: Mon Oct 18, 2021 8:15 am Post subject: Z 16 Charging question

....sadly I think you're right.

William Daniell



LONGPORT



+1 786 878 0246

On Mon, Oct 18, 2021 at 11:50 AM user9253 <fransew(at)gmail.com (fransew(at)gmail.com)> wrote:



 	  Quote: 	
		  --> AeroElectric-List message posted by: "user9253" <fransew(at)gmail.com (fransew(at)gmail.com)>

 

 It is unlikely that the Skyview is at fault.  The vast majority of electrical problems are

 caused by bad connections.  Take every related connection apart and reassemble.

 

 --------

 Joe Gores

 

 

 

 

 Read this topic online here:

 

 http://forums.matronics.com/viewtopic.php?p=503558#503558

 

 

 

 

 

 

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  -

 Electric-List" rel="noreferrer" target="_blank">http://www.matronics.com/Navigator?AeroElectric-List

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 eferrer" target="_blank">http://forums.matronics.com

 ===========

 WIKI -

 errer" target="_blank">http://wiki.matronics.com

 ===========

 b Site -

           -Matt Dralle, List Admin.

 rel="noreferrer" target="_blank">http://www.matronics.com/contribution

 ===========

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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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wdaniell.longport(at)gmai
Guest

Posted: Mon Nov 01, 2021 6:30 am Post subject: Z 16 Charging question

Update:

I installed a bandc AVC 1 voltage regulator.  This has integral overvoltage protection and an internal relay simplifying the installation.  I changed the voltage pick up location from the shunt to the bus.

Voltage, bus amps and battery charging amps are stable.

Interestingly the headset howl which I suppressed by turning down mic gain has also gone away and I can turn the mic gain up to 50%.



 



William Daniell



LONGPORT



+1 786 878 0246

On Sun, Oct 17, 2021 at 7:55 PM William Daniell <wdaniell.longport(at)gmail.com (wdaniell.longport(at)gmail.com)> wrote:



 	  Quote: 	
		  I have a Rotax 912 with a Z16 and Dynon Skyview

The ammeter sometimes ( defined as once every 25 flights)  goes off the chart to 60a. I get the red X over the instrument.  Then it comes back and goes down to normal and sits there at whatever loads I have on the system.  I have always assumed that this was a Dynon bug.

My Dynon has a shunt installed between the generator and the bus which measures the entire load normally rock steady at 7A or 8A when using the autopilot.  I also have an independant  hall effect sensor measuring amps on the fat wire to the battery.

Today I noticed on climb out that the hall effect sensor was showing battery charge oscillating from +1.7A to +2.5A - normally it is steady.  I switched off the alternator and the hall effect sensor showed steady -7A in agreement with the load shown on my dynon (7A).  (I turned around and landed immediately.)   Voltage is steady.

I checked the alternator as per https://pointsforpilots.blogspot.com/2012/12/testing-rotax-912914-generator-and.html.   All within limits.

So my next steps are to change the regulator, which involves taking out the crowbar because the BandC had one internally,  (I had already bought a BandC voltage regulator some time ago) and the battery which is pretty much due for a change.

Any other thoughts?

Thanks

William Daniell



LONGPORT



+1 786 878 0246

- 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:

http://www.matronics.com/Navigator?AeroElectric-List

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