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If you are confident that the pre-arm check failure is not a real problem you can disable the checks by:
Connecting your Flight Controller to the Mission Planner
Go to Mission Planner’s Config/Tuning >> Standard Params screen
set the Arming Check drop-down to “Disabled” or one of the “Skip” options which more effectively skips the
item causing the failure.
Push the “Write Params” button
Ideally however you should determine the cause of the pre-arm failure and if it can be resolved, return the
Arming Check parameter back to “Enabled”.
Disarming the motors:
Disarming the motors will cause the motors to stop spinning. To disarm the motors, do the following:
1. Check that your flight mode switch is set to Stabilize, ACRO, AltHold.
2. Hold throttle at minimum and rudder to the left for 2 seconds till the propeller stop to spin.
3. On the PIXHAWK the RGB LED will start flashing green.
4. Press the safety button until the led begins flashing
5. Disconnect the LiPo battery.
6. Turn off your transmitter.
It needs GPS if flight with Loiter, or PosHold mode.
Please make sure that the propellers stop to spin and then arm or it will cause the drone roll over.
Turn of the function that spin when armed (without speed when motors are armed and throttle is at
zero)
If you connect the battery and armed, the motors begin to have speed even though the throttle is at zero from
the version 3.1 firmware. It reminds you that PIXHAWK is in service and please take care of the safety.
This function is very importance for the safety but if you do not want use this function, you can turn off it.
How to turn off this function:
Setup the number of Spin when Armed from 0.100 to 0.000 as the picture below.