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You can check your Failsafe by performing the following tests with the Turbo Pix connected to the Mission
Planner either via a USB cable or telemetry link. You can complete these tests without plugging in your LiPo
battery but if you do connect a battery you should first remove the propellers.
Test #1: if using the “Low-Throttle” method, ensure the throttle channel drops with loss of radio contact
Ensure your RC transmitter is on and connected with the throttle all the way down and flight mode set to
Stabilize
The throttle (channel 3) PWM value should be approximately as in first illustration below. Its value may be
higher or lower but it should definitely be at least 10 higher than the value held in the FS PWM field
Turn the transmitter off and the throttle PWM value should drop to be at least 10 below the FS PWM field
value (as in the second illustration below) below
Test #2: ensuring motors disarm if in stabilize or acro with throttle at zero
Switch to stabilize mode, arm your motors but keep your throttle at zero. Turn off your transmitter. The
motors should disarm immediately (red led will start flashing, DISARMED will be displayed in the Mission
Planner’s Flight Data screen).
Test #3: ensuring flight mode changes to RTL or LAND when throttle is above zero
Switch to stabilize mode, arm your motors and raise your throttle to the midpoint. Turn off your transmitter.
The Flight Mode should switch to RTL if you have a GPS lock or LAND if you do not have a GPS lock (the
flight mode and GPS lock status are visible in the Mission Planner’s flight data screen).
Test #4: retaking control after the failsafe has cleared
continuing on from test #3, turn your transmitter back on
while the flight mode is still in RTL or LAND and armed, change the flight mode switch to another position
and then back to stabilize mode. Ensure that the flight mode displayed on the Failsafe page is updating
appropriately.
Test #5 (optional): removing power from the receiver
Switch to stabilize mode, arm your motors and keep your throttle above zero.
Carefully disconnect the power wires connecting the receiver to the APM
The Flight Mode should switch to RTL or LAND as described in Test #3
Warning: unplug the APM so that it is powered down before reattaching the receiver’s power
4.2 EKF FailSafe
FS_EKF_ACTION
Note: This parameter is for advanced users
Controls the action that will be taken when an EKF failsafe is invoked
It defaults the value 1, that is the drone will land if lose signal, but you can change the setting from value 1 to
value 2, which means the drone will AltHold if lose signal.