burning wires in COMPASS_MOT calibration !

Hi,

during the COMPASS_MOT calibration I burned the wires with the DF13 plugs from the PM to the Pixhawk.

I'm lost because it is the second time this happened with two different FC on the copter.

I'm using 6S Lipo and a PM that reads DC in 2S - 7S - 5.4V, 3A

It looks (pic) the two ground wires smoked most.

Please- I could use a hint on whats my error is. The copter formerly flies, it is a rebuild.

R0019503_rez.jpg

R0019504_rez.jpg

R0019506_rez.jpg

You need to be a member of diydrones to add comments!

Join diydrones

Email me when people reply –

Replies

  • remove the Vcc and GND wire form the compass JST connector. looks like your Vcc and GND wires are reversed on compass. I assume that you are using a Compass amd GPS combo.

  • ok, found the cause of the problem:

    the hint with the "poor ground connection" is right, It was even worse. Due to a crash into an apple tree one or more motors continued spinning for a while (perhaps  RTL).

    That burned the main conductor track on the PDB.! It acted like a fuse. (See pic)

    So ALL the current flows over the two 26AWG wires between the PM and the power connector to the Pixhawk. wow!

    I found it because after Andre mentioned the ground thing I test all the ground wiring with a multimeter und suddenly found no continuity from the negative Lipo plug (in) to the negative connector of a motor at the end of the arm. :o

    So I opened the shell of the PDB an saw the burned track!

    Now solved, ready to take off again.  Thank you very much for writing Andre and Mossbackfarm !!! :)

    burned PDB.jpg

    https://storage.ning.com/topology/rest/1.0/file/get/3702272898?profile=original


  • Bernardo said:Can I make a derivation and feed one of the the + and - over a 5V BEC (2S - 8S)??



    Mossbackfarm said:

    Many power modules don't support 6S...is it an attopilot, or (maybe) the HK module?



  • Mossbackfarm said:

    Many power modules don't support 6S...is it an attopilot, or (maybe) the HK module?

    R0019510.JPG

    R0019509.JPG

    R0019508.JPG

  • It is the PM that is delivered with the Pixhawk or the CUAV FC.

    So they're too weak for 6S.

    @Andre = I don't understand the ESC thing. I have (hexacopter) ESC with two wires (gnd and signal). How that could fry the ground wires between the PM and the DF13 power plug to the Pixhawk?

  • Village=voltage (the crappy mobile version does not allow edit)
  • You have a huge gnd resistance causing village drop between PM and at least one ESC.
    Then the negative is traveling thru PM and ESC wire.

    Fix the poor gnd connection, and\or remove ground loop by disconnecting pwm Ground and +5v
  • Many power modules don't support 6S...is it an attopilot, or (maybe) the HK module?

This reply was deleted.

Activity

DIY Robocars via Twitter
Friday
DIY Robocars via Twitter
RT @_JonMyer: 🏎 We need your help in naming my #AWS DeepRacer Underground Track 🏎 @davidfsmith's track is going to be referred to as 𝗔𝗪𝗦 𝗗…
Thursday
DIY Robocars via Twitter
RT @gclue_akira: 仕事もおわったし、電脳化にとらい #マリオカートハック https://t.co/4IU90hCLgm
Thursday
DIY Robocars via Twitter
This is the hashtag to follow all the people in Japan who are hacking the new Nintendo Mario Kart with the real AR… https://twitter.com/i/web/status/1319281354664677376
Thursday
DIY Robocars via Twitter
RT @gclue_akira: @chr1sa @diyrobocars jupyter mario https://t.co/P0oHdjlCRq
Thursday
DIY Robocars via Twitter
RT @_JonMyer: 🚨Our 1st AWS DeepRacer Community Race is Underway on http://twitch.tv/aws 🚨 Join us to find out which member of your commu…
Oct 20
DIY Robocars via Twitter
Oct 19
DIY Robocars via Twitter
RT @BackyardRobotcs: After an admittedly long wait, the new Tinymovr R3.3 motor controller is now available https://tinymovr.com 🥳
Oct 19
DIY Robocars via Twitter
RT @_JonMyer: 🏎 1 hr left before the #AWS #DeepRacer Community 🏎 Top 5 Race tomorrow LIVE on Twitch 1st Place = $50 Amazon GC or AWS Credit…
Oct 19
DIY Robocars via Twitter
Oct 16
DIY Robocars via Twitter
Oct 15
DIY Robocars via Twitter
Oct 14
DIY Robocars via Twitter
RT @davidfsmith: Race virtually with The AWS DeepRacer Community Race and then join us on the track to see how your times compare on the ph…
Oct 14
DIY Robocars via Twitter
Oct 14
Hiroki Tanaka liked Hiroki Tanaka's profile
Oct 13
DIY Robocars via Twitter
RT @breadcentric: It's now!
Oct 13
More…