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ERROR CODE 24 BL-LIMITATION

Discussion in 'Cinestar 8' started by kjetil tønnesen, Nov 30, 2012.

  1. kjetil tønnesen

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    Hello
    i just get the error code 24 bl -limitation on my mx 20
    what can i do
    i looked at my bl temp and two off them were at 52
    so that isent higth
    i was just hovering around in my garden and when i landethe cinestar 8 i get the message on the screen??

    i use 5cell and 13x6,5 carbon props
    i never got this before??
    can it bee the battery
    thanks
    kjetil
     
  2. kjetil tønnesen

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    anyone that now ?
     
  3. SteveWilson

    SteveWilson Member

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    I've seen Error 24 with high temps or high amps being pulled through a BL-Ctrl, and with a very low battery. I'd check your GPX file and make sure you weren't pull 40+ amps through one motor for some reason and if you can eliminate that, I'd blame the battery.

    What was the battery voltage at the end of the flight?
     
  4. Josh Lambeth

    Josh Lambeth Well-Known Member

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    I too had this issue when I was running my old setup. Strange thing was I would see the error on my MX20 but when I looked at the GPX file there wasn't any error being recorded?

    Josh
     
  5. kjetil tønnesen

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    thanks steve and josh
    i will test that out tomorrow and let you now
     
  6. Andy Johnson-Laird

    Andy Johnson-Laird Administrator
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    This can be either over temperature or overcurrent. Given that you are seeing temperatures of 52C, then it must be overcurrent or the sensor is bad. Overcurrent, going from the source code, is 60A as I recall. I can check that again if you need to know the actual limit.

    Let me know which version of the firmware you're running if you need to me to find the limit in the source code.

    Andy.
     
  7. Andy Johnson-Laird

    Andy Johnson-Laird Administrator
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    Afterthought: Do you have a microSD card in your MX20? I'd be curious to see what it is recording in the way of telemetry given that the GPX file is not showing any error.

    I've also been wondering whether, given that the sampling rate of the GPX file is once a second (that's the default anyway), whether it would be possible for a brief spike in current to occur that would trigger the Err 24, but not get recorded in the BL-Temps when the next sample occurred.

    Could you post your GPX file, please kjetil?

    Thanks
    Andy
     
  8. SteveWilson

    SteveWilson Member

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    I think there has to be something relating to low battery/current that will trigger that error too. I've seen it enough times. Can you look in the code?
     
  9. kjetil tønnesen

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    hello andy
    i will use my sd in the navicontrol tomorrow and take a fligth test and post the gpx file

    i check the temp off all bl and it was from 25-48c
    i only get the error code 24 when i land and turn off the motor,never when i fly

    but i will get back to you tomorrow
     
  10. Andy Johnson-Laird

    Andy Johnson-Laird Administrator
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    Now that's officially weird....well, let's see what we can clean from the GPX file.....

    Andy.
     
  11. Arthur Vieira

    Arthur Vieira Flight Squad

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    Take a look at the capacitors on the Power Dist Board, maybe one of them is getting loose.
     
  12. kjetil tønnesen

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    ok,i will look at that ,thanks for the tips
    i just went out flying and nothing happens in fligth
    but when i turn off the motor the error 24 appears on the mx 20 screen??
    it´s ice cold outside now with snow and all that ,i will try to log one off my fligth when the weather is better
     
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  13. kjetil tønnesen

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    hello
    if i run a motor test in mk tool one by one motor ,can i then see if any off the motor is getting higther amps ?
    so that i can eliminate the motor´s?
     
  14. kjetil tønnesen

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    i have taking to holger and he said that when the error code come when you have stoped the motor
    thats normal and he shoud fix it in the new firmware:)
     
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  15. Andy Johnson-Laird

    Andy Johnson-Laird Administrator
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    H Kjetil:
    Sure -- if you set the motor test slider to exactly the same number for each motor that would give you some idea whether one motor or BL Control was pulling abnormally high or low current.

    One question you need to consider is whether or not the test would reveal a problem if there is no load (that is, no propeller) on the motor.
    I would want to do that test with the propeller on, personally, but it always makes me very nervous to spin up a motor with a propeller on indoors!

    Andy.
     
  16. Andy Johnson-Laird

    Andy Johnson-Laird Administrator
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    Hi Kjetil:
    I understand part of what you said (that the firmware indicates an error 24 only when the motor has stopped).

    I do not understand what Holger is going to change -- if this is the normal behavior, why is he changing anything, please?

    Thanks
    Andy.
     
  17. kjetil tønnesen

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    why get this message when nothing is wrong?
    ,that is what he wil changing ,it´s like a bug :)
     
  18. Andy Johnson-Laird

    Andy Johnson-Laird Administrator
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    Oh, OK. Thanks, Kjetil.

    The error message 24 is being indicated when there is nothing wrong.
    I have seen one instance of that when a motor would not start on my C8, but I thought it was moisture on the BL-Ctrl.
    It appears as an Error 24, but there is no overcurrent or overtemperature situation.

    Thank you for clarifying it.
    Andy.
     
  19. kjetil tønnesen

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    no problem andy
     

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