EFIS D-100 OAT

[Dave Boxall(Guest)]

Hi

I'm fitting an EFIS D-100 in an RV-9A (not yet complete).

I've just wired up my D-100 & powered it up connected to the EDC and OAT probe for the first time. I'm having a little trouble with the OAT.

The unit finds the EDC and shows a roughly correct heading. The heading swings when I hold a lump of steel near the EDC so that seems to work. If the unit is set to a type 1 OAT it fails to find the OAT. If set to a type 2 then it displays 57 C. Its pretty cold here in the UK at the moment (around 2C). When I warm the OAT the temp rises to 59C, then shows OAT not found or something, but the unit will find the OAT a while later on a restart (back at 57C again). It was getting late, cold & dark in the hangar by that time, so I came home.

I checked the wiring connection of the OAT to the EDC.

I'm also not really sure about whether I have a type 1 or 2 probe, as I have a "magic marker" band about 1" from the OAT, not a 1" piece of heatshrink you mention elsewhere in this forum....

Any suggestions

Thanks

Dave

 

[dynonsupport]

This is a little puzzling, though here are two ways to get some more information for us to help you troubleshoot:

First, with the power disconnected (keep alive too if it is hooked up), measure the resistance between the OAT's yellow and red wires, and also the resistance between the yellow and blue wires. Let us know what you find for each of these measurements.

Additionally, hook up a laptop to the EFIS-D100 (with the EDC connected as it usually is), and using the Dynon Product Support Program from our website, select firmware "Detect Firmware Version" and report back the firmware version numbers you get for both the EDC and the EFIS.

 

[Dave Boxall(Guest)]

Many thanks! I'll drag my laptop down to the hangar & see what I can find.

Dave

 

[Eric]

Just a shot in the dark here but make sure that your unit is set up to display the temp in Celsius and not Fahrenheit. 57 degrees Fahrenheit is about 14 degrees Celsius.
Eric

 

[Dave Boxall(Guest)]

Hi

I checked the software version - the EFIS was on V1.02.00, the EDC on V1.03.00. I thought I might as well try updating the firmware & now have V1.02.00 on the EFIS and V1.04.00 on the EDC. That brought the OAT down from 57C to 37C. When I changed the settings to a type 1 probe the OAT came down to 2C - the same as my car thermometer. Looks like a winner!

I guess I didn't expect to require a firmware update as there is only the initial firmware release for the EDC.

Since it all seems to be working fine I didn't bother with the resistance measurements.

Many thanks for your help.

Dave