APM 2.8. One motor spins at full throttle when battery plugged in

ArduCopter
1

Hi.

I am building a DJI F550 with APM2.8. I have calibrated all ESC’s using the manual one by one method and all beeps seem to be fine. When I then unplug the LiPo battery to get out of ESC calibration mode and then plug it back in to begin to fly, after a few seconds one motor spins( number 6 in the HEXA X configuration) at full throttle and wont stop until I unplug the battery.
I am unable to arm the hex after this happens as well.

Any help would be greatly appreciated.
Thanks

2

I took the copter outside again and this time I swapped the ESC wires 1 and 6, i.e. I swapped the motor inputs 1 and 6 going in the flight controller. This resulted in motor 6 no longer spinning when the battery is plugged in but now number 1 is. This leads me to believe that there is something wrong with the signals going to motor output number 6 on the APM2.8 itself and that the problem does not lie with the ESC’s or the motors

Again, any help is greatly appreciated

Thanks

3

post your dataflash logs

4

I’m quite new to building drones and that should explain why I have no idea what data flash logs are and how to get them.

Please help

5

Okay, I manage to find the dataflash logs on MP and download them “via Mavlink”. There are four in total and I’m not sure which you want.

6

Also. It says that is downloaded to a folder and I can find that folder but I have no idea which thing in there you are looking for.

7

Upload the .bin or .log file to Dropbox, google drive etc and post the link here
So that the experts can have a look

8

tlog 1 1-01-1970 1-00-00 PM.bin.log.param (5.0 KB)
2 1-01-1970 1-00-00 PM.bin.log (19.7 KB)
2 1-01-1970 1-00-00 PM.bin.log.param (5.0 KB)
tlog tlog tlog tlog 1 1-01-1970 1-00-00 PM.bin.log (644.0 KB)

9

I hope something in there is useful. I’m not exactly sure what I’m looking for because there are a lot of .bin or .log files but most arent just that. They have extra eg. .bin.log.gpx or .bin.kmz or .bin.log.param or .rlog or .tlog etc…

10

I found this when I clicked “Auto Analysis” in the DataFlash Logs section

Test: Autotune = UNKNOWN - No ATUN log data
Test: Brownout = GOOD -
Test: Compass = GOOD - No MAG data, unable to test mag_field interference

Test: Dupe Log Data = GOOD -
Test: Empty = GOOD -
Test: Event/Failsafe = FAIL - ERR found: FLT_MODE
Test: GPS = FAIL - Min satellites: 0, Max HDop: 99.99
Test: IMU Mismatch = UNKNOWN - No IMU log data
Test: Motor Balance = UNKNOWN -
Test: NaNs = GOOD -
Test: OpticalFlow = FAIL - ‘FLOW_FXSCALER’ not found
Test: Parameters = GOOD -
Test: PM = GOOD -
Test: Pitch/Roll = GOOD -
Test: Thrust = GOOD -
Test: VCC = GOOD -