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Amperage runaway

 
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BobD



Joined: 05 Jan 2016
Posts: 51
Location: Sheffield UK

PostPosted: Wed May 23, 2018 12:31 am    Post subject: Amperage runaway Reply with quote

During a flight test of my Europa on Friday, The AMPS display on my Dynon Skyview failed (the big red cross) for a while, then came back again, then failed again, and finally came back until the end of the flight of about 1 hour. I have attached a screen-shot of the Savvy Analysis tool, which shows that at the time of the failure, there appeared to be an Amperage runaway, although the voltage remains fairly constant. At the time of the first failure, we were conducting climb tests, so the engine got fairly hot (as you can see from the lower graph showing Oil Temperature), but engine temperature was normal during the second failure. Dynon suggested checking the wiring at the Shunt, or a potential EMS module failure. I took of the cowl, and inspected the wiring around the Shunt, but this seemed OK.
I wondered if anyone you had seen anything similar anywhere, or have a potential explanation for what happened ?


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Bob Dawson
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PostPosted: Wed May 23, 2018 2:29 am    Post subject: Amperage runaway Reply with quote

Identical symptoms on my skyview....hi Bob.
My europa Tri had runaway amps followed by red x.  Cycling the alt cb reset the instrument  but sooner or later it would happen again.
We know that on a good day the rotax can produce 17 amps so I wasn't worried.  And if 70 amps were really running through the system one would expect some exciting sparks and smoke none of which ocurred.
I dismantled everything and found that the little screws on shunt connectors were loose.
I am in a major overhaul of the electrcial system so i havent started the engine again however if i were you i would check everything but not do anything drastic.  My assumption would be that it is an instrument issue and not a fundamental issue.
Will


William Daniell
LONGPORT
+57 310 295 0744

On Wed, May 23, 2018, 03:38 BobD <rjd(at)bobdawson.plus.com (rjd(at)bobdawson.plus.com)> wrote:

Quote:
--> AeroElectric-List message posted by: "BobD" <rjd(at)bobdawson.plus.com (rjd(at)bobdawson.plus.com)>

During a flight test of my Europa on Friday, The AMPS display on my Dynon Skyview failed (the big red cross) for a while, then came back again, then failed again, and finally came back until the end of the flight of about 1 hour. I have attached a screen-shot of the Savvy Analysis tool, which shows that at the time of the failure, there appeared to be an Amperage runaway, although the voltage remains fairly constant. At the time of the first failure, we were conducting climb tests, so the engine got fairly hot (as you can see from the lower graph showing Oil Temperature), but engine temperature was normal during the second failure. Dynon suggested checking the wiring at the Shunt, or a potential EMS module failure. I took of the cowl, and inspected the wiring around the Shunt, but this seemed OK.
I wondered if anyone you had seen anything similar anywhere, or have a potential explanation for what happened ?

--------
Bob Dawson
XS TG || 912 ULS || G-NHRJ




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BobD



Joined: 05 Jan 2016
Posts: 51
Location: Sheffield UK

PostPosted: Fri Jun 01, 2018 11:44 pm    Post subject: Re: Amperage runaway Reply with quote

Thanks for your response William.
I took your advice, and checked the Shunt ( nothing obvious ). Not flying for the next few weeks, so will check again when next in the air ( and watch closely during the ground run ).
I will also be updating the Skyview software to the latest release before the next flight (although doubt that this is relevant to this particular potential problem )


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Bob Dawson
Europa XS TG || 912 ULS || G-NHRJ || Dynon Skyview || PilotAware || SmartAss3
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PostPosted: Sat Jun 02, 2018 2:43 am    Post subject: Amperage runaway Reply with quote

Ok

Well the good thing is that its unlikely that the rotax generator will put out anything over 17amps so you're unlikely to have sparks and smoke.
I have just installed a cheap hall effect ammeter because because my dynon did an uncommanded reset in flight.  This brought to mind the need for back of flight and key engine instruments.
That said in general terms i like the dynon very much but like any gizmo it can fail.
Will
Xs tri 912 turbo dynon airmaster
On Sat, Jun 2, 2018, 02:49 BobD <rjd(at)bobdawson.plus.com (rjd(at)bobdawson.plus.com)> wrote:

Quote:
--> AeroElectric-List message posted by: "BobD" <rjd(at)bobdawson.plus.com (rjd(at)bobdawson.plus.com)>

Thanks for your response William.
I took your advice, and checked the Shunt ( nothing obvious ). Not flying for the next few weeks, so will check again when next in the air ( and watch closely during the ground run ).
I will also be updating the Skyview software to the latest release before the next flight (although doubt that this is relevant to this particular potential problem )

--------
Bob Dawson
XS TG || 912 ULS || G-NHRJ




Read this topic online here:

http://forums.matronics.com/viewtopic.php?p=480575#480575






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