After firmware update - constant throttle but motors speed continues to increase - almost flyaway - Discussions

I recently upgraded to the latest version of the Pixhawk 3.3.2

After the upgrade when flying in Stabilize or Loiter when increasing the throttle slightly the motors continue to increase in speed. Making it totally unresponsive and unpredictable to fly.

After decreasing the throttle the quad took a couple seconds to respond and stop spinning.

Luckily I was able to land without too much damage by switching to Land mode - which seemed to operate fine.

I have tested this on the ground with props circled clockwise in Stabilize mode and the same is true putting the throttle at 10% the motors continue to increase in speed for some time to what seems to be close to 100%.

I am really scared to fly and tune while the quad is so unresponsive - don't want to damage any one or thing.

Any guidance or suggestions would be much appreciated so that I can get back up and flying before new years!

Setup

450 Deadcat

Pixhawk

Motors - SunnySky X2212

ESC - 20amp Multi Star

Prop - 10'

Battery - LiPo 5000mah

GoPro 3+

Thanks!

Screen Shot 2015-12-03 at 9.22.06 PM [Dec 3, 2015].png

loiterAltitudeGainWithNoThrottle-anon.bin

indoorTestWithPropsReversed-anon.bin

Replies

Andre K. December 22, 2015 at 1:52am

check vibrations or post log from AP if you want somebody to actually be able to help.
- Andre K. > Andre K. December 22, 2015 at 3:33pm
  
  Well, you convert .Bin to .Log, can use mavlogdump to do that fast if your system has mavproxy.
  
  Then, since you run Linux (which I would assume as you apparently like privacy) you can do:
  cat flight.log | awk '!/GPS/ && !/POS/' > public.log
  
  This way you'd remove the messages that contain position.
  - hi1ton > Andre K. December 25, 2015 at 9:43am
    
    Log files attached
    
    Screen Shot 2015-12-03 at 9.22.06 PM [Dec 3, 2015].png
    
    flightlogs.zip
    - Andre K. > hi1ton December 25, 2015 at 12:20pm
      
      how did you export .BIN to .log ? for some reason - I am unable to view it in APM Planner 2
      - hi1ton > Andre K. December 28, 2015 at 3:21pm
        
        Hi Andre, please find updated Bin files.
        
        I tested and was able to open in APM now - let me know if you have any issues and hopefully what you see
        
        Thanks,
        
        loiterAltitudeGainWithNoThrottle-anon.bin
        
        indoorTestWithPropsReversed-anon.bin
        
        Andre K. > hi1ton December 29, 2015 at 12:17pm
        
        the IMU.AccZ logs your Z vibrations - acceptable range is supposed to be between ~-5 and ~-15
        
        you are mostly just barely within those limits, or exceeding them.
        
        if you plot IMU.AccZ , use graph controls to define -5 ...-15 , otherwise it's easily to think it looks nice when the "landing" causes the grapg to scale between 5 and -65
        
        hi1ton > Andre K. January 10, 2016 at 11:23pm
        
        Hi Andre,
        
        Thanks for the advice.
        
        I have done quite a bit of vibration testing but not noticed anything unusual
        why is that when i put just a small amount of throttle, the servo command to the ESC goes to almost 100%
        
        How do I know if it is my Pixhawk that is faulty?
        
        I have attached some new log files of a test with constant throttle and reversed props
        
        Thanks
        
        2016-01-10 22-28-34 8.zip
        
        https://storage.ning.com/topology/rest/1.0/file/get/3702912112?profile=original
        
        Andre K. > hi1ton January 11, 2016 at 8:45am
        
        I have no idea what's going on here, I doubt it's defective, that would be a *very* strange failure.
        
        I think it's something configuration-related, try backing up .param, do reset to defaults, then compare with you backup.
  - hi1ton > Andre K. December 24, 2015 at 12:24am
    
    Hi Andre
    
    I have uploaded a zip with logs from 2 flights one with reversed props and one during an actual flight where you will see altitude gain without throttle increase. It seem that the vibrations are in normal range.
    
    I also update the image in the post.
    
    Any suggestions are welcome and appreciated.
    
    Thanks!
- hi1ton > Andre K. December 22, 2015 at 12:57pm
  
  Hi Andre,
  
  Thanks for the suggestion - I will work on adding that to the post.
  
  What file should I upload from the log? And how do I exclude or change the GPS location for privacy.
  
  We did check vibrations but did not seem out of whack

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