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Battery failsafe not triggering

Posted by Alex on July 20, 2017 at 3:53pm

Hi,

I am an experienced flyer but this has me stumped, maybe one of you guys can help. The battery failsafe will not trigger even though the aircraft battery voltage drops to 1V less then the failsafe voltage while in flight. FS is enabled and set to RTL (I checked the pull down selection as well as the FS_BATTERY_ENABLE=2 parameter in the parameter tree)

Aircraft is using a new Holybro Pixhawk running Arducopter 3.2.1. 6S setup on a large hexacopter. Failsafe set at 22.2V. Battery voltage shown on Mission Planner telemetry is accurate (matches the cell checker). I have three identical aircraft and they are all behaving the same!

Any ideas? Thanks.

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Replies

  • UAV Skies August 3, 2017 at 2:18am

    How would fail safe work when you are providing power via USB?

    This is not a bug.

    Alex said:

    Found the problem. For some reason the battery failsafe doesn't work when the USB port on the Pixhawk is in use. In my opinion that is a bug and hopefully it got fixed on later Arducopter versions.

    Thanks for the help!

  • Alex July 31, 2017 at 10:06am

    Found the problem. For some reason the battery failsafe doesn't work when the USB port on the Pixhawk is in use. In my opinion that is a bug and hopefully it got fixed on later Arducopter versions.

    Thanks for the help!

  • UAV Skies July 25, 2017 at 3:51am

    I can at least tell that you are somewhere near SFO/San Diego area.. :)

  • UAV Skies July 25, 2017 at 3:48am

    You need to upgrade both Mission planner to latest version and Ardu copter to 3.5


    I recall there was a bug in failsafe features in the older versions.

    Whatever your secretive company is doing needs to be migrated to newer and stable platforms.

    Are you using APM or Pixhawk?

  • Alex July 21, 2017 at 2:20pm

    Yes, it is a custom version of Mission Planner but only a minor change. Also the firmware is older version but was working well in other aircraft so I didn't want to fix what was not broken. The reason why the radio failsafe is disabled is it allows missions further than RC transmitter range.

    The parameters involving the battery failsafe are so simple and easy to check, which is why the problem is frustrating.

    I can't attach the data file because it is a company site and they are secretive about their location.

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