ESC cut off with 3S, but keep running with 4S

Posted by Franc on September 13, 2014 at 2:16pm

i have a very strange problem today..

everythign was runinng fine with a 3S. then i tried a 4S and ok.

put back the 3S.

now some motors cut off at half throttle just before taking off from the ground.

i can hear a beep like ESC resetting? i dont understand what it coudl be.

i heard could be bad wiring? but why it works with 4S and not 3s then?

UPDATE

another rookie mistake: i was using both 4s and 3s batteris without noticing the Batter Module was setup for the 4s. bottom line APM was cutting off power because they thought the battery was very low, 12v instead of 16v fo the 4S.

again, the battery failsafe was the problem. it;s the second time the batery failsafe causes me problems. i just disabled it and done.

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Tags: apm, but, current, cut, esc, off, out, voltage
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Replies

  • Felixrising September 14, 2014 at 6:58am

    Glad you sorted it. 

    I have no idea why the software doesn't just auto-detect cell count and let you define a per cell voltage alarm threshold instead.. would make it easier to use and avoid these kinds of problems when you forget to go in and update the threshold.

  • BustamyTool September 13, 2014 at 4:10pm
    Try recalibrating the esc's
    • Franc > BustamyTool September 13, 2014 at 6:34pm

      i changed all the ESCs with older 30A esc.... still same problem... i think is the APM at thi spoint...

    • Franc > BustamyTool September 13, 2014 at 4:54pm

      tried already.... but motors 1 & 2 (on a Y6B config) are keeping cuting off at half throttle...

      i'm giving up.... it's just a mess this hobby

  • Franc September 13, 2014 at 2:16pm

    up

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