new OAT installation

[A321Flyer]

I installed my OAT sensor (black band around cables at sensor, connection to external magnetic sensor) today. It started to read wrong 37° C for quite some time, but changed to correct 22° C after some time (2 min.).

After restart of the Dynon it showed wrong 37°C again for at least 3 min.

Is this behaveour normal?

Regards Martin

 

[brothwood]

I have installed the Dynon part No. 100433-001, OAT sensor(with the black band) and have connected it to the DB9 connector which mates with the EDC D10A as described on page 7-7.Connection to my D 180 provides magnetic heading but no OAT. I have checked and rechecked the connection as decribed on page 7-7 without success. I have also followed the instructions to select Tye 1 or 2 Sensors - double zeros n both.

Readings on the cable from the OAT sensor are as follows:- Red to Blue-open circuit: Red to Yellow-open circuit;Red to Screen- open circuit; Blue to Yellow - 13.9 KOhms; Blue to screen soldered together for connection to the white led from the EFIS connector.

Any advice please, I've already spent 6 uncomfortable hors in the back of my Falco!

Regards, George

 

[dynonsupport]

A321Flyer: Can't say that's normal, or that we have an explanation for what you're seeing. What complement of Dynon products do you have in the airplane?

Brothwood: Under the EMS SETUP>SENSORS, make sure that none of the GP inputs are set to OAT. If one of these inputs are set to OAT, it will override the OAT that you have connected to the EDC. Under the EFIS SETUP>OAT menu, type 2 is the correct sensor type. But, rereading your post, all of that might be moot. You may have a broken probe if you're reading open between yellow and red. You should be seeing about 10K there.

 

[brothwood]

I am still fitting out the airplane and need to ensure that fittings in the tailcone are operating properly before installing the rear fuel tank which will make entry to the rear fuselage virtually impossible, hence I connected only the EFIS plug into the rear of the D180 to test out the EDC -D10A and the OAT probe. As described, EDC-D10A is producing correct indications. I will re-check resistance between leads.
With the D-180 I have the EDC-D10A, OAT Sensor, 4xEGT Sensors, 4x CHT Sensors, Oil Temp, Oil Pressure, MAP Sensor,Fuel Flow and pressure sensors, unheated Pitot with AoA and all Dynon wiring looms, ie. pretty well the full kit. Will come back with confirmed readings.
Regards, George

 

[brothwood]

Yellow and Red are showing 9.78 ( dry joint?) however still nothing from the OAT sensor. I have only the EFIS plugged in the Dynon 180, could this be the cause?
Regards, George

 

[A321Flyer]

I have an EFIS-D10A and an EMS-D120 (linked with DSAB).

An EDC-D10A is connected to the EFIS. I updated the EDC according Service Bulletin 110107 (EFIS/EMS/EDS were bought in 2006). The OAT-sensor is connected to this EDC. The OAT has a black heat shrink tube around the cables close to the sensor (type 2).

The EFIS gets data from the EDC/OAT immediately after startup. I however observed a strange behaviour: The OAT on the EFIS and EMS show (wrong) 37°C, but I realized that if I heat the sensor with my hands, it jumps within a couple of seconds to correct 23°C. If I don't touch the sensor, the OAT-reading will remain at 37°C...

I was not able to perform an EDC-heading callibration yet (fuselage is still in the garage), but that probably is insignificant for the OAT-reading?

Any ideas?

Thx and regards
Martin

 

[dynonsupport]

I'm suspecting either a sensor with some intermittent connection (hence why touching it, essentially moving it, fixes it), or that is otherwise broken.

One check to see if the OAT is outputting the wrong thing: unplug the OAT before you turn anything on or touch the OAT to "fix" it (it's presumably in it's 37F "state". Measure the resistance between the yellow and blue wires. Then hook it up, heat it to "fix" it, shut everything down, and do the test again. What are the two resistances that you read?

 

[brothwood]

Yet again I have re-tested the connections between the OAT sensor and the plug into The EDC-D10A - (Red to yellow gives 9.75 KOhms) EFIS still does not recognise the OAT probe. I have disabled OAT in the EMS Menu - still no OAT in the EFIS. Manual increase/Decrease of OAT results in only limits to +10 and-10 degrees C.
Can't think of anything else apart from connections from EDC-D10A to Main unit.
Any ideas please?George

 

[dynonsupport]

It's actually the resistance between yellow and blue (as mentioned above) that will be more revealing... did you happen to measure that?

We're looking at either at something wrong with the probe or something wrong with the EDC. We're trying to figure out which one it is.

Also, you'd previously mentioned that your EDC-D10A was working correctly. Let's make sure that's the case. Wave a magnet (a headset earcup works great) around the front of the EFIS-D10A. You SHOULD NOT see a heading deflection if the EDC-D10A is connected and working properly.

 

[brothwood]

As mentioned above I now have a reading of 9.78KOhms between yellow and red.
I waved the magic magnet around the EFIS D180 A main indicator unit (is that what you refer to as EDC-D10A in your above reply?) without affecting the heading indication.
All EMS inputs checked - none registering OAT. Selecting OAT inputs1,2 or none in EFIS only allowed me to enter from +10 to -10 deg C.manually. Still no OAT indication on Inputs 1 or 2, just 00 within a black rectangle.
On another point, I have installed 4 x CHT and 4 x EGT probes. Can I shorten the armoured cable from these probes, or is the length critical?Regards, George

 

[dynonsupport]

Again, that's not the resistance measurement that we're looking for. Please read the following carefully: measure resistance between the YELLOW and BLUE wires.

Also, wave the magnet around the EDC-D10A remote magnetometer. That should produce a heading change. Does it?

 

[brothwood]

I found your Sept.17th post most confusing. Quote -you SHOULD NOT see a heading deflection if the EDC-D10A is connected and working properly - unquote
Magnet movement around the magnetometer does change heading.
Yellow to Blue resistance 14.5KOhms.
EMS checked again, OAT NOT SELECTED anywhere.
In my last post I requested information about shortening the armoured wires from the CHT and EGT sensors - can I shorten tem or is the length critical?
Regards, George

 

[brothwood]

Further to my reply #11 above, I found that my EDC-D10A has a serial #006413, accordingly I performed the corrective action described in Service Bulletin110107. I refitted EDC-D10A and re-connected. Still no recognition of the OAT sensor, Compass working normally, andchanging when waved at by a magnet. All EMS channels checked - nothing relating to OAT selected anywhere.
Please give me something to work on.Regards, George

 

[A321Flyer]

I measured the resistance between the blue and yellow pin: 12.8 kOhm before switching on the EFIS/EMS.

Switching on the EFIS gives 37°C again, and after some time 20°C (but difficult to say, if that is because of touching/heating the sensor).

Measurement of the resistance between blue and yellow cable after switching EFIS off again: 12.4 kOhm.

It seems like the OAT-sensor is working but something might be wrong with the EDC?

Thx and regards
Martin

 

[dynonsupport]

brothwood - What we were saying was that if you have a magnet around the face of the EFIS - the screen itself - you SHOULD not see the magnetic heading change when the EDC - the remote compass - is connected. From your measurements, it sounds like your OAT is working. I'm suspecting there's something up in the compass end of things. Incidentally, make sure that you have EFIS>SETUP>OAT set to type 2. Give us a call at 425-402-0433 and ask for tech support. I think we're going to want to take a look at the compass. Yes, you can shorten the CHT/EGT wires.

Martin - Well 12.4K is 20C, so that's encouraging on the OAT side. I think your hypothesis might have legs. As above, give us a call at 425-402-0433 and ask for tech support.

Both of you - one last thing to check is the versions of firmware on both your EFIS and EDC. This can be done through the PC-based support program by choosing the "detect firmware version" option. If you have that capability, what are the firmware versions reported for each?

 

[A321Flyer]

Just checked the current version of both EFIS and EDC: EFIS = v4.0.0 but EDC = v1.4.0 (!). I realized that I never updated the EFIS with the EDC connected...

Updated all parts to v4.2.0 ... and the OAT reading is perfect from the beginning on.

Sorry for the troubles and thank you for the good support!

Regards
Martin

 

[dynonsupport]

Awesome!

 

[brothwood]

Following our telecon of yesterday, I sucessfully installed Firmware 4.2 with magnetometer connected - still unable to show OAT - shows 00 in a black rectangle. Re-checked and confirmed OAT not selected anywhere in EMS. Any suggestions please. George

 

[dynonsupport]

If you see the black rectangle, your OAT is not set under the EFIS setup. So the first thing is to set EFIS>SETUP>OAT> to type 2.

 

[brothwood]

Done that - still oo in black rectangle (The same result if I select 1 or none) Plus with 'none' selected I can only manually alter the temp. from -10 t +10, - doesn't seem right.George