OAT via HS34 in Celcius ???

[DBRV10]

Hi Dynon

We are having a great success with our D100/D180/HS34/AP74, so far all is good. This question maybe a thing we are doing wrong, but I am not seeing where.

We have the two wire OAT, out on the wing, into GP1 on the HS34. The OAT sensor type we think is set correct, otherwise it would not work at all. The display is set for Celcius on the EFIS, yet the numbers are wrong by a large margin, and can not be trimmed out.

We did a data capture today and while the data log shows what we expect is correct in deg F for example 56, the OAT we would believe to be 13 C and this is soundinging correct, yet the EFIS displays a number like 27 or 30 C.

It seems to me the F to C conversion is wrong, which would be strange, but possible as most of your customers work in F.

Where are we likely to be wrong?

More flight testing in the morning so I look forward to some bright ideas overnight

Cheers

DB

 

[dynonsupport]

Are all of your EMS GP inputs set to something other than OAT? Similarly, confirm that your EFIS OAT setting is set to "N" (because there's nothing connected directly to the EFIS. After that, do a DSAB reconfiguration to tell the system that the HS34-based OAT is the right one to use system-wide.

 

[DBRV10]

Ahhhhhhhhhhh now this is interesting!

I did notice today that the D180 OAT is correct, while the EFIS OAT was randomly weird.

I will do what you suggest and I am sure that will fix it.

Maybe I have missed this point but these sorts of things do not stand out in the manuals, so thank you!

So much great stuff in one place its easy to get lost in the technology.

Otherwise its so good!

Thanks DS

 

[DBRV10]

OK

Did as you say, the EFIS is set to N, the GP4 input is OAT and sensor one.

The OAT is correct on the D180 but as this is mostly used for EMS functions we do not look at this. The D100 is still not showing the OAT from the D180/HS34.

I did a reconfig of the network, but it does not show an OAT on the HS34. Is there a menu for setting up the HS34 I am not aware of?

Seems very weird to me!

Cheers!

PS.... Seems to me that the OAT is not being sent over the DSAB to the EFIS, how is that possible. OAT is perfect on the D180!

 

[dynonsupport]

I missed the totality of your configuration. One more configuration check for you... Is the OAT on both the EFIS-D100 and the EFIS side setup of the D180 set to N? Also, none of the GP inputs 1-3 (on the D180) are set to OAT as well, correct?

Come to think of it, you might have hit a corner case in our system. If the above is true, then it looks like we don't support an OAT connected to an HS34 (OATs are special in the DSAB network). In this case, try connecting the OAT to a D180 GP input (swapping whatever is there to the HS34), configuring the GP inputs appropriately, then reconfiguring DSAB. That should do the trick.

 

[DBRV10]

Somewhere on here I asked that question, or by email, hence why it went there. The comment was all analogues were the same as EMS.

The interesting thing is that the D180 see's the OAT accurately. It just will not pass to the D100. By the way the D100 is the Master.

Now as for changing a couple around, the other three are flap and two trims, sure its possible in theory, but as you can imagine in a nicely wired and very busy panel, that is really not a good option. Some owuld say I would rather take to my butt with a cheese grater

Might lob in a call in a minute!

DB

 

[jakej]

David

As you know I have just installed the same system setup in a customers Glasair - works a treat, give me a call.

Jake J

 

[dynonsupport]

David ended up calling, and we got it figured out, but in case anyone else runs into this:

There appears to be a small bug when doing DSAB configs. If the OAT is on an HS34 pin when you do the config, OAT doesn't get recognized in the system.

To resolve this:
1) Set the HS34 GP input that the OAT is on to "none"

2) Set any one of the three EMS local GP inputs to OAT. You may need to change flaps or whatever you have hooked up. This is temporary.

3) Re-do DSAB configuration

4) Change the local EMS GP input back to what it was

5) Change the HS34 GP back to OAT.

After this, OAT should work on all DSAB devices.

 

[jakej]

Can be easier than that - I turned off all inputs/sensors that weren't connected to the EFIS/EMS (OAT is direct to HS34) then did a reconfigure of DSAB - now it all works.

So with the OAT connected via HS34 it appears that anytime you change settings in the menus, re inputs/sensors, then a DSAB reconfigure is the way to go.

HTH

Jake J

 

[DBRV10]

Can confirm the DS procedure works!

Apart from the odd undocumented feature..... this system including the auotpilot in some moderate chop is working well!

Happy RV-10 campers!!!!

All we need is the AP76 one day and it will be perfect!

Thanks again to the Dynon tech folk. We nutted this out on the phone while DS did a test to discover what I had found. That kind of service is rare anywhere!

DB