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APM Arducopter all motors stop - any ideas? Log attached.

Posted by Martin on August 16, 2015 at 3:48am

Hi all,

after 20 or so flights without any problems my drone crashed. Suddenly, while in the air, all 4 motors just stopped. The battery was full and there was no Voltage drop. After I put it together it flies well... I can't see anything suspicious (for me) in the log. Can anyone please help me to understand what happend? The log is attached.

2015-08-15%2019-07-07.log

thanks in advance.

M

Quad 650:

motors: DYS 2814

ESC: 30A

LiPo 4S

APM powered by ESC

RX Flysky th9x

PS.

Failsafe seems to work fine (checked both low voltage and no radio and it does RTL)

I did not experienced any troubles regarding GPS, Compass or Vibrations...

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Tags: apm, crash, motor, stop
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Replies

  • Andre K. August 16, 2015 at 1:04pm

    APM maintained normal PWM control as it fell, the shutdown was not commanded.

    • Andre K. > Andre K. August 16, 2015 at 3:14pm

      .. so you should check what can make all ESC's stop.   - did they had +5v in common, and something shorted/oveloaded them - or maybe there was bad connection between battery and ESC ?

      • Martin > Andre K. August 22, 2015 at 2:44pm

        Thanks Andre,

        I don't quite understand what do you mean by writing (did they have +5v in common).

        As I see in the log, there was no problem with ESC voltage, also APM (which is powered from ESC) worked until the end when the quad fell.

        A problem with battery/connection was also my first thought, but I simply can't find anything to confirm it in the log. The quad fell when I was descending, so little current was needed and there is no additional equipment on the copter.Unless there is really some issue on the way from powermodule via distribution board to the ESCs, but then it is rather impossible to find out :( since the copter flies normally afterwards and I did not change anything.
        ..

        • Andre K. > Martin August 23, 2015 at 1:03am

          impossible to say without seeing it, but what I thought, is that your APM were powered by power module, and your ESC's +5v somehow dropped, (like when people overloaded them when using landing gear)

          ..that was just a guess/ a hint what to look for. Based on the log that did not show APM reducing/cutting PWM.

          • Martin > Andre K. August 24, 2015 at 1:59pm

            Well, to clear the issue.

            I use PM only to check upon the battery status (V and A) - I have only those 2 cables for measurement connected. The APM itself is powered via ESC. It may seem strange, but this is because I have some faulty PM which gives 7V instead of 5V.

            I checked all the connections to the ESCs and found some dirt under the isolation, so there is a chance that this could result in some shortage, but then again, would then the ESC have 5V? I think not...

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