Hi guys.. I just put together a Quanum Nova... bought a bargain one off Hobbyking for my daughter.. quad only, no transmitter or RX.
I already have a genuine 3DR APM 2.6 powered quad - and I'm fairly familiar with the whole thing, but this is confusing me..
Right - back to the Quanum Nova:
I added my own Frsky X8r RX without any issue, also plumbed a cheap gimbal in and got that working - including the tilt.
I then ran the thing up on the floor (minus the props of course) to give the thing a bit of a 'soak test' It arms fine, motors spin ok.. all looks perfect.
However, after a few mins of motors running, it goes into 'LAND' mode after a triggered Event/Failsafe = FAIL - ERR found: FS_THR.
I even watched the input from the radio - and I never saw the values for the throttle drop..
I cant see anything in the logs.. could someone brighter than me have a look? is this all because it's on the ground and not actually flying? maybe I'm a victim of my own caution..!
Auto Analysis:
Log File C:/Program Files (x86)/Mission Planner/logs/QUADROTOR/1/2015-07-27 23-21-27 13.bin.log
Size (kb) 87.62890625
No of lines 1684
Duration 0:00:00
Vehicletype ArduCopter
Firmware Version V3.1.2
Firmware Hash
Hardware Type
Free Mem 0
Skipped Lines 0
Test: Autotune = UNKNOWN - No ATUN log data
Test: Balance/Twist = GOOD -
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: FS_THR
Test: GPS = FAIL - Min satellites: 0, Max HDop: 99.99
Test: IMU Mismatch = UNKNOWN - No IMU log data
Test: Parameters = GOOD -
Test: PM = GOOD -
Test: Pitch/Roll = GOOD -
Test: Thrust = FAIL - Avg climb rate 5.02 cm/s for throttle avg 797
Test: VCC = GOOD -
Replies
Update!
I was brave enough to test the quad in the garden.
It armed in stabilise, and hovered very well. Suddenly there was what I can only describe as a pulse in one or more motors... and it landed.
I disconnected the gimbal power and tilt servo lead - suspecting an issue there...then I took off again at a low hover.
After a few minutes there was the odd pulse or blip on the motors and it landed again.
Looking at the log, in both instances there was a FS_THR event that triggered the land command.
This time I see (what I think) is the Throttle input drop to zero? am I reading this right... ? If so then the FS_THR was definitely valid!
What on earth could cause this sudden plummet in throttle?
I'm using a Tanaris bound in D16 with channels 1-16 enabled. The output to the Flight Controller is by SBUS using an FRSKY SBUS to CPPM converter.
I also use conventional PPM outputs direct from the RX to the Gimbal for pitch control.
All the cables look fine, with good connections...
I'm hoping someone cleverer than me could help on this..
2015-07-28 17-41-38.bin
Well...in reply to myself.. I eventually found the solution.. so thought I'd place it here for closure's sake - and if anyone else has had problems with FRSKY X8R or X6R RX's
FRSKY eventually admitted there was an issue with the Euro version firmware, they recently provided an update that I loaded onto ALL my FRSKY RX's..
The issues is now solved.