QR X350 Pro LVC modification and FS_BATT_VOLTAGE setting in APM

Discussion in 'Walkera QRX350/QRX 350 Pro/QRX 350 Premium' started by Ozmick, Jan 3, 2017.

  1. Ozmick
    Offline

    Ozmick Member

    Joined:
    Dec 8, 2016
    Messages:
    34
    Likes Received:
    0
    Trophy Points:
    6
    Location:
    Adelaide Australia
    Ratings:
    +0 / 0
    Hi everyone.

    I just bought a QR X350 Pro with F12E and iLook3.

    I have watched plenty of videos about the Low Voltage Cutout problem and desperately want to avoid a rebuild.

    I wonder if anyone knows, there is a video on youtube that shows the FS_BATT_VOLTAGE being changed to a lower value to trigger the RTL when the battery voltage reached that level set. So my question is this, Is modifying this value the same as doing the hardware mod of soldering the 2 wires together on the battery monitor?

    What will be the outcome if I alter the FS_BATT_VOLTAGE value and do the hardware mod as well?

    I hope someone here has the answers.

    Thanks in advance

    Mick

     
  2. bjr981s
    Offline

    bjr981s Moderator Staff Member

    Top Poster Of Month

    Joined:
    Sep 19, 2015
    Messages:
    5,374
    Likes Received:
    354
    Trophy Points:
    83
    Location:
    Sydney, Australia
    Ratings:
    +456 / 14
    That function is not supported in the Walkera FW. You risk damage to you model.
     
  3. Ozmick
    Offline

    Ozmick Member

    Joined:
    Dec 8, 2016
    Messages:
    34
    Likes Received:
    0
    Trophy Points:
    6
    Location:
    Adelaide Australia
    Ratings:
    +0 / 0
    Thanks. So is the LVC hardware mod OK to carry out?
     
  4. bjr981s
    Offline

    bjr981s Moderator Staff Member

    Top Poster Of Month

    Joined:
    Sep 19, 2015
    Messages:
    5,374
    Likes Received:
    354
    Trophy Points:
    83
    Location:
    Sydney, Australia
    Ratings:
    +456 / 14
    Definitely not. It is not supported and very risky.

    You might get away with it for a while on a new battery but as the battery ages and it will do this much faster with the mod. You will end up with a battery warning and then a couple of seconds later a motor power off and fall from the Sky.

    LiPo flight batteries should never be drained below the nominal voltage. i.e. 3.7V per cell.

    If this was a bug Walkera would have addressed it with a FW upgrade as the did with the Runner 250.

    Its your model, your dime, so its your call.

    Cheers
     
  5. Ozmick
    Offline

    Ozmick Member

    Joined:
    Dec 8, 2016
    Messages:
    34
    Likes Received:
    0
    Trophy Points:
    6
    Location:
    Adelaide Australia
    Ratings:
    +0 / 0
    Thanks again mate. I haven't touched anything on it yet and I wont. So whats the best way to avoid the flying brick scenario because I definitely dont want to crash it.
     
  6. bjr981s
    Offline

    bjr981s Moderator Staff Member

    Top Poster Of Month

    Joined:
    Sep 19, 2015
    Messages:
    5,374
    Likes Received:
    354
    Trophy Points:
    83
    Location:
    Sydney, Australia
    Ratings:
    +456 / 14
    • Ensure you have the latest FW installed.
    • Ensure that you do the calibration successfully. (On level Ground - with the return to level ground before the lights stop flashing)
    • Ensure that you do 3 manual flights slowly rotating on the yaw access after the calibration to fine tune the compass. Before attempting GPS Flight
    • Ensure that you do not ARM until you have sufficient satellites for a good RTH position lock. (So wait for it)
    • Do not over discharge the batteries. Don't go below 3.7V per cell in flight. (most "Fall from the Sky" relates to battery issues and that is not fixed by mods.)
    • Never fly with damaged or nicked props. Always balance your props. An unbalanced prop with create vibrations and case the FC to reset in flight (Fall from the Sky ensues.)
    • Never change any default settings and never connect to Mission Planner unless you need to do a read only error log diagnostic.

    Cheers
     
  7. Ozmick
    Offline

    Ozmick Member

    Joined:
    Dec 8, 2016
    Messages:
    34
    Likes Received:
    0
    Trophy Points:
    6
    Location:
    Adelaide Australia
    Ratings:
    +0 / 0
    You're awesome mate. Thank you again.

    Is it ok to use one of those little battery indicators with alarms on them like banggood sell for the battery indication. I have seen them mounted on the battery cover and they say you can hear them on the audio feed from the iLook.

    2 x 2 in 1 Lipo Battery Low Voltage Tester 1S-8S Buzzer Alarm

    That is my last question.

    Once again many thanks.
     
  8. bjr981s
    Offline

    bjr981s Moderator Staff Member

    Top Poster Of Month

    Joined:
    Sep 19, 2015
    Messages:
    5,374
    Likes Received:
    354
    Trophy Points:
    83
    Location:
    Sydney, Australia
    Ratings:
    +456 / 14
    Yep. recommended. Make sure that you set the voltage alarm to 3.7V
     
  9. Ozmick
    Offline

    Ozmick Member

    Joined:
    Dec 8, 2016
    Messages:
    34
    Likes Received:
    0
    Trophy Points:
    6
    Location:
    Adelaide Australia
    Ratings:
    +0 / 0
    Thank you mate. Your help is greatly appreciated.

    Have a good day.
     
  10. Moso
    Offline

    Moso Member

    Joined:
    Jul 28, 2017
    Messages:
    208
    Likes Received:
    3
    Trophy Points:
    18
    Location:
    Auckland, NZ
    Ratings:
    +3 / 0
    Would you explain what you meant by this?
     

Share This Page

Search tags for this page

settaggio drone walkera qrx 350