I need help. I had maiden flight my skywalker 1680 with APM 2.5. There was no FPV gear and powered by 3s 5000mah battery. I am using a separate 3 Amp uBEC (max 5 amp) to power the APM to the input rail. so JP1 jumper was off. The ubec was given input from balance charging connector of main battery. The output rail of APM was connected to ESC.
After flying for 7 minutes at a slow speed and in circles i landed to have a look. The uBEC black (ground) wire was almost melted and about to short circuit. I was lucky to have landed.
So what is wrong. ?? is my APM drawing more than 3 AMPs?? not possible with JP1 removed . Please see image. The black wire of uBEC was melted on both its input and output side of uBEC.
Have i wired them wrong or uBEC thin wires are crap?? Myu BEC was warm to touch but not very hot itself.
One more thing... i am using a 900mhz xbee telemetery module onboard. from where it draws power?? is this a drain on ubec?? does it draw power from input??
Secondly the moment i rev up the motor (sunnysky 1450 kv on 3s) bad compass warning came on mission planner HUD. remained there through out flight. i flew in manual so no harm. Its a RFI issue but how to solve that? i had carried out complete compass calibration earlier.
Any help would be appreciated.