Possible reasons for motors not responding

Discussion in 'Cinestar 8' started by Derek Cooper, Feb 12, 2015.

  1. Derek Cooper

    Derek Cooper Active Member

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    Out to fly today, but didn't get airborn - flight controller was complaining of a motor problem.

    Packed up, came home, hooked the drone up to MK-Tool, no errors reported but motor test shows no response from motors 2, 3 and 5. Drone config per below.

    Had time to do a quick connection test of the bullet connectors - all seem fine. Given that I'm Canadian, I had to head out and am now sitting at the hockey rink for my daughter's practice. Googling and thinking what are likely causes.

    Thoughts?
     
  2. Andy Johnson-Laird

    Andy Johnson-Laird Administrator
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    Where below, Derek?

    Seems very strange to lose three motors, one even numbered and two odd.
    It sounds like either the FC has a problem or the ESCs do.

    Is the humidity exceptionally low? Static electricity?

    Andy
     
  3. Derek Cooper

    Derek Cooper Active Member

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    My signature.

    Nope, dry as a bone here. Really puzzling.
     
  4. Andy Johnson-Laird

    Andy Johnson-Laird Administrator
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    You said: "Drone config per below" but there was nothing below.

    With it being dry as a bone, then static electricity discharge can be a real problem -- since you last flew did you have occasion to remove the FC, NC, PDB, or GPS boards from the copter?

    Andy.
     
  5. Derek Cooper

    Derek Cooper Active Member

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    Haven't removed the boards yet - what are you thinking?
     
  6. Andy Johnson-Laird

    Andy Johnson-Laird Administrator
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    If you had removed the boards in very low humidity without anti-static protection, you could have well damaged a board -- but you haven't done so, so all is well on that front.

    Andy.
     
  7. Derek Cooper

    Derek Cooper Active Member

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    Hockey's almost over - I'll get back to it soon. Intriguing.
     
  8. Derek Cooper

    Derek Cooper Active Member

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    BL reporting error 32 - "BL Selftest error," and the explanation in the docs is just a reiteration basically of the error code. Not much help.
     
  9. Derek Cooper

    Derek Cooper Active Member

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    Reported as follows to support:

    Was out to fly today - Cinestar X8, MK Double Quadro V3 Cool, MK Flight Control V2.5, MK Navi V2, MK GPS V2.1.

    The BL is reporting an "Error Motor," on startup - motors 2, 3 and 5 giving me a 16 blink code - error current measurement.

    How can I resolve the problem? Just developed today - couldn't shoot on a job.
     
  10. Andy Johnson-Laird

    Andy Johnson-Laird Administrator
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    Derek: Presuming you got the BL-Ctrl board from Quadrocopter, you are probably going to have contact them I'm afraid -- it sounds like, for reasons unknown, several of the BL-Ctrls have expired. I've not seen this problem reported before -- I realize that is of no comfort to you, but it's indeed a first.

    Sorry I can't be of more help.
    Andy.
     
  11. Derek Cooper

    Derek Cooper Active Member

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    Yup, submitted problem report last night to Quad - will report what they say.
     
  12. Derek Cooper

    Derek Cooper Active Member

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    Got it resolved - BL is on its way back to Germany. We had a prop obstruction on the last flight. Apparently when this happens it sends an amp spike back to the BL and it flakes out for each motor address that was obstructed. Explains why three of them went dead.

    Only way to fix it is for the Mikrokopter folks to do their magic.
     
  13. Andy Johnson-Laird

    Andy Johnson-Laird Administrator
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    "Prop obstruction?" Do you mean a tip-over with resulting prop strike?
    Seems like that should not really cause a BL-Ctrl to blow up and ground the aircraft. I've had sufficient prop strikes since I've been flying copters that my colleagues think that's how I normally stop the motors. :rolleyes:

    Andy.
     
  14. Derek Cooper

    Derek Cooper Active Member

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    Yup, that's exactly what we surmise is the cause of the problem.

    Checked the logs and can clearly see the spikes back to the BL. Apparently the Quad guys have seen it before more than once and it does cause problems with the BL that the end-user can't fix, nor can Quad fix, thus they have to ship the board back to MK in Germany.

    It's fixed under warranty.
     
  15. Andy Johnson-Laird

    Andy Johnson-Laird Administrator
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    I've been doing some systematic testing of BL-Ctrls (which I'm in the process of writing up) and with the bench power supply at 16 volts, when I command the a ramp-up of throttle from idle to maximum, and then a sudden max to idle command, the voltage at the power supply went from 16 volts to 32 volts as the MK BL-Ctrl "dumped" the energy in the motor back into the LiPo -- so I think you might have experienced something similar when you shock-stopped the motors. Still, it's surprising to see that a shock-stop would trash the BL-Ctrl.
    Andy.
     
  16. Derek Cooper

    Derek Cooper Active Member

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    Agreed, you wouldn't expect the BL to cack like that, indeed. Now that we know that, almost need to have a spare BL on hand to swap out on the next prop obstruction, cause they do happen unfortunately!
     

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