Data Flash Log

Posted by Wojtek on April 30, 2016 at 5:00pm

Hi,

I have issue with my new build Quadrocopter - at the end of "time" test - it has crashed.

The Multirotor was in Loiter mode since the begining of the test. While flying the copter was keeping position wery well - even while 360 rotation.

Suddenly (@ 22 min) has crashed.

I was testing my quadrocopter while 13m/s wind (pushing to ground) and "RTL or land" was enabled @ 12.8 V.

While the battery V was 12,5 V the drone starts loosing Alt and received 30 degree list to right - then RTL enabled but it was not able to pick up...

1. Why does the RTL started @ 12.5 V ?

2. Which information I need to check in log-s ?

3. Do You thing that battery V was to low and wind (13m/s - pushing to the ground) was to strong for remaining V to maintain position ?

4. Could You advice where I can find explanation of all shortscuts which are in log file ? I cannot understand some.

5. While beeing in Loiter can I check the CH 1,2,3 & 4 output (manual) ? I need to check If I by mistake have lowered the throttle...

Please find attached log file (I have cut the begining due to to heavy file) and Auto Analysis log created by MissionPlanner

Thanks a lot ! :)

LogAnalyzer.txt

2016-04-30 13-35-44 - CutCopy.rar

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Tags: pixhawk, crash, log
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Replies

  • Antonio Rosillo May 1, 2016 at 6:53pm

    Hi Wojtek

    In your log I can see that the FS Voltage is set to 13 volts, for a 4S battery it should be set at list to 14 volts.

    Did you configure the power module to reed the correct voltage?

    See http://ardupilot.org/copter/docs/common-power-module-configuration-....

    At the beginning of flight there is a suddenly voltage drop from 15.8 to 13.8 volts, can't explain that, looks like the battery lost one of the cells.

    voltage drop.png

    Power Module Configuration in Mission Planner — Copter documentation
    • Wojtek > Antonio Rosillo May 2, 2016 at 12:28am

      Hi Antonio,

      14 Volts - I will set this value - thanks for advice.

      Sudden voltage drop was is because I have cut the log file (middle part) because It weight was 66 MB originally.

      Your png file is awesome - How You made graph for current Vlotage & Capacity and...

      13.2 V is minimum for stabilize mode, 13,9 V minimum for Alt Hold and 14,8 V minimum for Loiter ?

      I was in Loiter @ 13V - You think it was the issue ?

      Correct voltage & power module,Yes I have set it but Mission Planner is not saving the "sensor : Power Module" it is changing to "sensor: Other" after closing and reopening Battery subpage

      One more concerning Voltage. I have Taranis X9D Plus and I cannot see the current reading form the pixhawk - I donot know why. That is why I have module connected to smart port of receiver to see current V.

      The "Taranis telemetry" V is diffrent from Mission Planner V - which value shall I trust on ? The Taranis V value is higher from Mission Planner value.

      Thanks ! :)

    • Peter Barker > Wojtek May 4, 2016 at 2:10am

      Looks like you lost thrust where motor number 3 was.  3702743821?profile=originalCommon causes are:

       - motor seizing up

       - ESC blowing up

       - prop failure of some description

       - bullet connector coming loose

  • Brandon MacDougall April 30, 2016 at 8:15pm

    1. Why does the RTL started @ 12.5 V ?

    Hello, Could be your failsafe settings are set to high.

  • SkyRover April 30, 2016 at 5:11pm

    Post your log and other people can check too.

    http://ardupilot.org/copter/docs/common-mission-analysis.html

    • Wojtek > SkyRover May 1, 2016 at 12:00am

      Hi,

      Please find attached to my 1st post files - LogAnalysis & log .

      Thanks.

This reply was deleted.