DJI equipment violently flips

Posted by David Brewster on August 16, 2012 at 4:18am

Hi guys.

I've build several DJI crafts, 2 quads and a hex.

I picked up another DJI Quad with the motors, props, ESCs with the intention to try with APM2.5.

So I have it all wired up. Since the DJI ESC do not have a BEC, I added another just to power everything up.

On my first attempt to fly it immediately/violently flipped over to the right.

I did the motor test and say I had swapped front right and back right wires.

Corrected that, and just to be safe redid the auto ESC calibration.

Redid the motor test and everything spun the right way (and yes I have the right props and the APM is pointing the right direction).

But the problem persists. A violent flip over to the right.

Luckly I have not broken any props yet.

Any ideas?

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Replies

  • David Brewster August 16, 2012 at 10:24am

    I've reset it up from scratch.

    Re-flashed the firmware.

    Did an erase/reset from the CLI.

    Setup my radio and did a motor test.

    Change my stabilization P to .08 as someone suggested.

    I've attached a video (forgot to show the computer screen saying that it was level so you'll have to trust me on that).

    Kinda the same problem before - it wants to flip - although before it wanted to flip to the right, in the test I did after this video it wanted to flip back. Did the test again and it wanted to flip left... so it looks like the direction of flipping is random.

    PLEASE someone help. I have a DJI/450/Naza as well but I'm really turned on by the APM capabilities if I can get it to work and I'll dump my other DJI.

    https://www.youtube.com/watch?v=X5ys8eRj3YE

  • Rui Manuel Cravo Marques August 16, 2012 at 5:39am

    Ok, if you have checked both the ESCs calibration, motor rotation direction and propellers, recheck just in case :) then,

    you may try the following procedures :

    1 - Connect the APM to the mission planner, and having the quad in a flat and leveled surface, make sure the horizontal horizon is leveled, if not, run the "level apm" from the configuration tab.

    2 - make a live calibration procedure rotating the quad in the 3 axis (also in the configuration tab)

    3 - make sure you are using the quad firmware or that your frame is configured for quad in X or + configuration accordingly to your hardware configuration

     

    4 - make sure you have erased/reset the board before and after uploading the firmware

     

    5 - I'm not familiar with the dji ESCs, but if they have a brake setting, make sure it's off on all the ESCs

     

    6 - Try to lower your RATE P to 0.080 and use te CH6 tunning feature to find your best RATE P setting. I think around 0.100 or 0.110 will be the best for your frame (I'm using one like that)

     

    This is what I can think of right now, I hope there's a simple thing :)

     

  • Bill Jowitt August 16, 2012 at 4:31am

    Quick thought - have you checked the motor numbering? DJI and ArduCopter have different numbering schemes. DJI from front right anti-clockwise in X format is 1,2,3,4 but ArduCopter is 1,3,2,4

  • Jeff Zika August 16, 2012 at 4:28am

    I had the same problem with HIL testing in xPLane. Just continued to flip over on power up. Using 2.7 HIL Quad-X. Haven't tried on real quad yet. 

This reply was deleted.