I am running omnibus f4pro on V4.0.3. I have this message popped up during cruise in auto mode twice already, on two different plane and two different radio system. I am not running any telemetry nor groundstation. The only failsafe I have enabled is Throttle failsafe for loss RC link.
There were no other messages prior to, or after, this message appeared. Everything seemed to be working fine and I still had full control. No failsafe event was triggered. On the contrary, I was worried about failsafe not triggering in the event of actual RC link loss, so I turned back. On the way back, I turned off the transmitter just to see if “throttle failsafe off” is really off. Nope, still had the “Flight mode =11”, then when I turned the trasmitter back on, I got “Failsafe. Long event off: reason=3”. So at the end of the day, everything seemed to be working okay. Should I be worried or not. Is this message a false alarm?
Got this message again today when flying high overhead. Like before, absolutely no anomaly prior to and after this message. No RC link loss and everything is working fine. Several minutes later, I got an actual RC link loss. Here are the messages:
Why is throttle failsafe working if it is really off ? Secondly, why does the message “Throttle Failsafe OFF” appear very briefly during an actual failsafe event ?
I don’t know if this helps, but I’ve had issues when the throttle failsafe value was too close to the low throttle PWM value. The failsafe value was still lower than the low throttle value, and it never appeared to dip below, but I was getting failsafe warnings. I lowered the throttle failsafe value an extra 5 or 8us and the problem went away. Just make sure you test your failsafes again if this works.
I have the same problem today(another plane with r9slim+ Fport) it was really serious. I almost lost control and landed plane with the throttle on and off repidly. here is the Bin file
These aren’t random messages. It looks like you were getting actual failsafes. Your throttle value was dropping repeatedly to 875, well below your default 950 THR_FS_VALUE. Your flight controller was trying to tell you there was a problem, so proceeding with the flight may not have been the best decision.
The battery and current readouts are very jagged. I wonder if you’re having some kind of power issue to the receiver? I would look at the receiver, it’s wiring, and it’s power supply.
The receiver was fine. I have check it with multimeters.
What is the difference between lost RC link and throttle failsafe? Here are what I had,when I deattach the module from the radio while the plane is in the air. the plane will do RTL. and when the throttle failsafe is trigged. the plane lost throttle and did not do RTL.
The throttle failsafe is one of the means of triggering an RC lost link. Some receivers when they loose link will drop the throttle output signal below the normal ~950us. This will trigger the RC lost link. Other protocols such as s-bus will send “no pulses” and the FC recognizes that as a lost link.
I am using frsky r9slim+ with fport. is that sbus combined? can I set throttle failsafe to 875 below. as the plane will do RTL once the RC link is lost.
That still doesn’t solve the problem why the signal kept dropping so low. Changing the throttle failsafe to 875 doesn’t fix it. There’s still another issue there that needs to be addressed.
Connected by SBUS to RCIN and FRSKY telemetry port to S.port in
interesting! Because i receive telemetry in this time and RSSI normal as you can see on log data!
Guess what, this happen to me as well today. The battery voltage graph was spiky at times mainly in cruse mode, that made no sense, but after reviewing the flight video, I saw “Throttle failsafe off” message. If I was losing the RC link and triggering FS, that make sense since my R9 module power was set at 10mW.
Tomorrow I will fly at 500mW. I am using fport protocol, Matek-F765.
Any further discussion on this topic? Atleast the developer team should change the message to “Throttle failsafe ON” not OFF.
A better message would be “Failsafe Warning” followed by “Failsafe Triggered”
I found a bug where the message “Throttle failsafe off” could be displayed before the message “Throttle failsafe on” is displayed.
The following is the code that outputs these messages.
The function “rc_failsafe_active()” returns true if the throttle PWM falls below THR_FS_VALUE at least once. If this condition continues for 10 times (failsafe.throttle_counter == 10), “failsafe on” is set.
If rc_failsafe_active() == false when failsafe.throttle_counter is 2, the “if” statement on line 297 becomes true and “failsafe off” is output.
Allister, on Speedybee 405 wing running 4.4.3, I cannot lower the FS pwm value below 925, it’s hard coated in the parameters. My throttle calibration value are 988, but during boot up I am getting “failsafe off” warning and then it is getting cleared.
I uploaded a short video at the bootup. First it says failsafe on and than failsafe off???
