Shark_peki
I love flying!
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AMP Reading not Working - Skyview
- Thread starter badia358
- Start date
Shark_peki
I love flying!
- Joined
- Jan 5, 2014
- Messages
- 16
Shark_peki
I love flying!
- Joined
- Jan 5, 2014
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- 16
Result : both EMS have dead Amps reading. We think if we can do something bad, and we kill it. We found no way how to do it. Only possibility is that shunt is wrong, and it increase ohms from 0,001 to something significantly bigger, then current goes to sensor and can kill EMS sensor. But shunt must be really ill.
Shark_peki
I love flying!
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Next steps : we take new EMS from just installed to new Shark, connect to this ill Shark, and will use just this shortcut connector. If everything will be OK, we will change shunt as well and make final instalation. Will check everything step by step, and report.
Shark_peki
I love flying!
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Installed new EMS and new shunt, and Amps working. Now.
jakej
Well-Known Member
So....which item was at fault ? shunt or EMS module ?
Jake J
Jake J
swatson999
Well-Known Member
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Do you have two wires coming out of the PIDG connector on one of side of the shunt (the left, in the photo above)?
badia358
Member
I have always suspected the EMM or the shunt. For my next test I was going to try a different shunt with and external amp meter connected the same why as the Skyview shunt to see if that works. But it will be a while before I get back to my hanger due to being out of the state where my plane is.
Would love see what is causing the problem since the AMP reading is the only thing that did not work from my Skyview installation. Thank you.
Would love see what is causing the problem since the AMP reading is the only thing that did not work from my Skyview installation. Thank you.
Steve made a good observation. If you have confused the 2 orange with blue tracers you have no shunt in circuit but whatever is connected to the other wire orange blue wire would not care. Since the shunt is almost bullet proof, you may very well have mixed these two wires. Otherwise the EMS module, more likely than the shunt but I vote for mis wired.
Happy trouble shooting.
Happy trouble shooting.
badia358
Member
In my case it has to be an issue with the EMS because I have D37-24 wire (Orange/Green) and D37-25 wire (Orange/Purple) connected to the shunt via a 1 AMP fuse in series. I checked with an ohm meter to make sure that they were not shorted to each other or something else and I also checked with the ohm meter to make sure that they were going to the correct pin. Thank you
badia358
Member
My point was that I used an ohm meter to ohm out from the D37 connector pin 24 to one side of the shunt and from D37 connector pin 25 to the other side of the shunt. In each case the reading was zero ohms. I also connected the 2 wires together and the Skyview did not display 0 AMPs.
If there is something else that I should check, please let me know because the last thing that I want to do is pull the EMS because it is in a hard location to get to. Thank you.
If there is something else that I should check, please let me know because the last thing that I want to do is pull the EMS because it is in a hard location to get to. Thank you.
Alex,
An ammeter shunt typically produces 1 mv per amp. Not certain what Dynon uses possibly they can weigh in. If you take a 1000 ohm resistor and a 10 ohm resistor in series across a 1.5 V battery you will generate ~15 mv across the 10 ohm resistor. Connect the ends of the 10 ohm to the ammeter inputs of the EMS and you should see 15A on the Skyview.
Note that the shunt is a .001 ohm resistor to give 1 mv per amp, if you didn't disconnect the shunt prior to checking the continuity of the wires it would be good to do so. If you test between the wires at the EMS with the shunt in place it will look like a dead short.
Hope this helps, forgive me if I have stated what you already know.
An ammeter shunt typically produces 1 mv per amp. Not certain what Dynon uses possibly they can weigh in. If you take a 1000 ohm resistor and a 10 ohm resistor in series across a 1.5 V battery you will generate ~15 mv across the 10 ohm resistor. Connect the ends of the 10 ohm to the ammeter inputs of the EMS and you should see 15A on the Skyview.
Note that the shunt is a .001 ohm resistor to give 1 mv per amp, if you didn't disconnect the shunt prior to checking the continuity of the wires it would be good to do so. If you test between the wires at the EMS with the shunt in place it will look like a dead short.
Hope this helps, forgive me if I have stated what you already know.
badia358
Member
Thank you...
To be clear - when you're shorting pin 24 to pin 25, there should be no connection to the shunt at that moment. take the two wires from the EMS (from pins 24/25) that normally connect to the shunt screws, completely disconnect them from the shunt, and then connect them together. This creates zero voltage between them, and should yield a 0 A reading on the EMS.
Shark_peki
I love flying!
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Boys, our result is that EMS are ill, and we will reclaim it. Not easy as it will take a weeks to get new, so I just ordered new and when will get them will sent this back.
If there are 3 aircraft that behave this same way, it is very unlikely that it is the EMS or the shunt. Since you're a manufacturer, please reach out to our support team directly at support at dynonavionics dot com for further help with this issue.