AMP Reading not Working - Skyview

[badia358]

AMP reading not working. I have the shunt that I bought from Dynon and the connection is made with pin 24 & 25 of the D37 connector. Most of the times it shows 94 AMPS and some times just dashes. I tied the wired for pin 24 & 25 together expecting to read 0 AMPS, but it was still 94 AMPS. Either I have an open wire or a wire going to the wrong pin. This would be easy to check, but it is in a hard to reach location under the instrumental panel.

Would it be possible for me to use another pair of wires to the shunt (like 23 & 31 since they have an AMP selection)? Or does anyone have any idea why the AMPS is not reading correctly? Thank you

 

[Dynon]

Those two pins are the only wires which support the amps connection. Are you saying that you connected pins 24 and 25 together w/o the shunt tied in at all? That SHOULD give you zero amps, as you claim. Are there any other readings on the EMS that are off the mark? Also, is there any chance that your shunt and your SkyView system aren't sharing the same ground?

 

[badia358]

Correct, I connected pins 24 and 25 w/o the shunt and I am not getting zero amps. Everything else in the EMS is working. The Skyview system and the EMS are sharing the same ground. Thank you.

 

[Dynon]

So you might wring out both those wires to be Aboslutely Sure that they're going to pins 24 and 25.

For background, hooking the wires together should always work and give you 0V differential, and a zero reading. 94A sounds like a maxed out input though, like one is grounded and the other is floating.

One more thing to try - just unplug the D37 and see if it goes to 0A (it should)

 

[badia358]

Today I checked the wires and they are going to the correct pin location. I also checked to see if they were shorted to ground and they were not. I will power up the unit with D37 unplugged and see what the AMP reading is. Thank you.

 

[badia358]

Unplugged D37 and just get --- AMPS with the graphic bar x out. Reconnected the wires to the shunt and now the display has --- AMPS with the graphic bar x out. Thank you.

 

[jakej]

Alex
Just a thought - can you post a photo of your amp shunt as you have it wired ?

Jake J

 

[badia358]

Due to business it will be another month before I get a chance to work on the plane again and take a photo. But let me try and explain.

One end of the shunt is connected to the wire that goes to the alternator. This side of the shunt connects to D37 pin 24 with a 1 AMP fuse in series.

The other end of the shunt is connected to the wire that goes to a 50 AMP circuit breaker that connects to the load.
This side of the shunt connects to D37 pin 25 with a 1 AMP fuse in series.

 

[Shark_peki]

We have the same problem on last 3 Sharks. Amps not working. One already delivered to customer, next just debugging, delivery in a week.
What to check? What to adjust?

 

[Shark_peki]

Wire disconnected from shunt, or shortcut have no impact on numbers. Tomorrow we will check again pins on connector.

 

[jakej]

A picture of the shunt wiring may be more useful

Jake J

 

[Dynon]

So the amps shunt will generate 1mV per amp of current hooked up to it when it's correctly wired. That means that at 60A of current flowing through it, the middle column will end up close to .06.

Yours says .124, which means that the input is seeing a lot of voltage. We think it is essentially showing an off-scale reading, so there may be a mis-wiring on the EMS connector. We'd suggest taking pin 24 and connecting it directly to pin 25 (disconnecting the shunt). This will produce 0 mV, and should cause the reading to go to zero.

Are you using the shunt we supply, by the way?

If you emailed pictures of your shunt to support at dynonavionics dot com, that would help too.

 

[Shark_peki]

Electrician was not in work today. We alreday installed 8 SkyView sets, last 3 no Amps. I checked wire colours on shunt, looks correct. Red purple disconnected - no change in numbers, in contact with red= pin 24 direct to pin 25, no change in numbers. Must check connector

 

[Shark_peki]

Not red purple but orange purple. Disconnected, and in contact with orange green.

 

[Shark_peki]

Today checked pins on connector - ok. 24+25. But found both 1 A fuses dead. Something is wrong. Direct wire shortcut - no change. We go to prepare special connector, where will be nothing, just pins 24 and 25 connected with wire. If this will not give zero, EMS amps reading is wrong. Then will check this on next plane with the same problem. And next one is on assembly, wiring still not ready.

 

[Shark_peki]

Installed connector with just 24 and 25 wire connected. The same, not showed zero = EMS Amps sensor wrong. Go to check this on next plane.

 

[Shark_peki]

Installed

 

[Shark_peki]

Result - no change, no Amps

 

[Shark_peki]

The same problem on next Shark. Just numbers little different.

 

[Shark_peki]

Shunt