Servers by jDrones

Irresponsive Controls! Failsafe triggered! Apm


(Renato Bessa) #1

Hi guys!!! I was flying with my drone the other day and I lost control of it. It started drifting sideways and going down and the controls became irresponsive. When I checked the apm the red light was blinking as if it had lost radio bind.

I tried flying it low again and as soon as I took off it triggered failsafe.

Here was the first Error for it. Does anyone know what this means?

and this was the second,

Log File C:\Users\renat\OneDrive\Documents\Mission Planner\logs\QUADROTOR\1\2018-04-15 13-52-48.log
Size (kb) 195.06640625
No of lines 2912
Duration 0:01:03
Vehicletype ArduCopter
Firmware Version V3.2.1
Firmware Hash 36b405fb
Hardware Type
Free Mem 0
Skipped Lines 0
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: FS_THR
Test: GPS = GOOD -
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 = FAIL - Roll (-152.71, line 1982) > maximum lean angle (45.00)
Test: Thrust = GOOD -
Test: VCC = FAIL - VCC below minimum of 4.6v (4.505v)

I appreciate any help! Thank you in advance


(Mike Boland) #2

You will need to post a log file from the FC for anyone to more than guess at the problem.


(Renato Bessa) #3

My bad Mike, here is the link for logs:

Thank you for your time.


(Mike Boland) #4

As the report says you had a FS:Throttle event, in other words you lost radio.

As you don’t have your voltage and current configured, and the loging is at a bare minimum, that is about all that I can glean from the logs.
Here you can see the event against RCin.

Check your radio setup, that seems to be the problem area.


(OldGazer) #5

I agree. Radio failsafe with no attempt to either RTL or Land.

My next question is what brand and model of radio do you have?


(Renato Bessa) #6

Thank you guys for the help. My radio is the Flysky Th9x with a R9b receiver.

Could it also be something related to wiring with the apm? Or should I just set the radio up again?


(OldGazer) #7

The TH9X is a half decent radio, but I don’t trust the stock TX module or receiver. One of the things I don’t like about the stock TX and RX is that even though Fail Safe is listed in one of the Setup/Menu options in the radio, the stock RX does not have any fail safe functionality. BTDT…

The only way I know of to get a working fail safe is to upgrade to a FrSky XJT TX module and a compatible receiver like an X8R, X6R, etc.

This, coupled with the fact that the TH9X does not support flexible switch/knob channel assignments is why I bought a Taranis.

With that said, you need to make sure the receiver antenna is not being blocked or shaded by any carbon fiber and do a range check before each flight…


(Renato Bessa) #8

I will try and do that, it seems like the flysky th9x has been having a lot of signal problems.

The FrSky XJT TX may be the solution in this case!

Thank you all for taking your time to help me!


(OldGazer) #9

If you change the TX module you also have to change the receiver.