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On this page
  • Failsafe Actions
  • Low Battery
  • Object Detection
  • RC Loss
  • Data Link Loss
  • Geofence Failsafe
  • Return Mode Settings
  • Land Mode Settings
  • Vehicle Telemetry Logging
  • Hardware In The Loop Simulation (HITL)
  1. Vehicle Operation
  2. Settings & Maintenance

Safety Setup

PreviousCompass CalibrationNextJoystick Setup

Last updated 1 year ago

The Vehicle Setup > Safety page is used to configure the most important failsafe settings.

Failsafe Actions

Failsafe detection can trigger one of the following (selectable) actions.

Action
Description

None/Disabled

No action (the failsafe will be ignored).

Warning

A warning message will be displayed/announced.

Hold mode

Return mode

Land mode

CASA Outback Challenge rules

Unsupported. Do not use.

Flight termination

Turns off all controllers and sets all PWM outputs to their failsafe values. The failsafe outputs can be used to deploy a parachute, landing gear or perform another operation.

Lockdown

Kills the motors (sets them to disarmed). This is the same as using the kill switch.

It is possible to recover from a failsafe action (if the cause is fixed) by switching modes. For example, in the case where RC Loss failsafe causes the vehicle to enter Return mode, if RC is recovered you can change to Position mode and continue flying.

If a failsafe occurs while the vehicle is responding to another failsafe (e.g. Low battery while in Return mode due to RC Loss), the specified failsafe action for the second trigger is ignored. Instead the action is determined by separate system level and vehicle specific code. This might result in the vehicle being changed to a manual mode so the user can directly manage recovery.

Low Battery

The l_ow battery failsafe_ is triggered when the battery capacity drops below one (or more warning) level values.

The most common configuration is to set the action at Return mode at critically low level, land mode at current position if reaching dangerously low levels and the levels with Warn > Failsafe > Emergency. With this configuration the failsafe will trigger warning, then return, and finally landing as the capacity drops below the respective levels.

Alternatively set the Failsafe Action to warn, return, or land when the Battery Failsafe Level level is reached.

Setting
Description

Failsafe Action

Values are:

  • Warning. Warn (notification only) if capacity drops below Battery Failsafe Level.

  • Return Mode. Return mode and warn if capacity drops below Battery Failsafe Level.

  • Land Mode. Land mode and warn if capacity drops below Battery Failsafe Level.

  • Return mode at critically low level, land mode at current position if reaching dangerously low levels. Triggers warning, return mode and land mode at the respective levels.

Battery Warn Level

Percentage capacity for Warnings (if Warning action enabled).

Battery Failsafe Level

Percentage capacity for Return Mode action (if enabled).

Battery Emergency Level

Percentage capacity for Land Mode action (if enabled).

Object Detection

Enable/disable collision prevention and obstacle avoidance, and set the closest approach distance allowed when collision prevention is active.

Setting
Description

Collision Prevention

Disabled/Enabled.

Obstacle Avoidance

Disabled/Enabled.

Minimum Distance

Distance (metres) away from obstacle that vehicle will stop when collision prevention is active.

RC Loss

Set the action on RC loss, and how quickly the vehicle responds.

Setting
Description

Failsafe Action

Values are: Disabled, Hold mode, Return mode, Land mode, Data Link Auto Recovery (CASA Outback Challenge rules), Terminate, Lockdown.

RC Loss Timeout

Time after RC loss that the Failsafe Action is triggered.

Data Link Loss

Set the action on data-link loss (loss of telemetry to ground station), and how quickly the vehicle responds.

Setting
Description

Failsafe Action

Values are: Disabled, Hold mode, Return mode, Land mode, Data Link Auto Recovery (CASA Outback Challenge rules), Terminate, Lockdown.

Data Link Loss Timeout

Time after data link loss that the Failsafe Action is triggered.

Geofence Failsafe

Set the action on impending fence breach, and the radius and/or altitude of the geofence cylinder.

Setting
Description

Action on (Impending) Breach

Values are: none, Warning, _Hold mod_e, Return mode, Terminate.

Max Radius

Horizontal radius of geofence cylinder. Horizontal geofence disabled if 0.

Max Altitude

Height of geofence cylinder. Altitude geofence disabled if 0.

Return Mode Settings

Generally return mode settings will be pre-configured by the supplier of the vehicle. The mode may be configured to use a return destination that is not affected by these settings.

Setting
Description

Climb to altitude of

Vehicle ascend to this minimum height (if below it) for the return flight.

Return home then

The action on return: Land, Loiter and do not land, or Loiter and land after a specified time.

Loiter Time

The time to loiter before landing (if return home action is Loiter and land after a specified time).

Loiter Altitude

Altitude at which the vehicle will loiter (i.e. before landing).

Land Mode Settings

Specify Land mode descent and disarm behaviour.

Setting
Description

Landing Descent Rate

Land descent rate.

Disarm After

Auto disarm vehicle on landing (the default) by enabling the checkbox and setting the disarm time. If checkbox not enabled, the vehicle will not disarm after landing.

Vehicle Telemetry Logging

Enable telemetry logging to vehicle storage.

Setting
Description

Telemetry logging to vehicle storage

Enabled/Disable logging.

Hardware In The Loop Simulation (HITL)

Pilots should not change this setting.

Enable hardware-dependent simulation: hardware in the loop or simulation in hardware.

Setting
Description

HITL Enabled

Values:

  • HITL and SIH disabled: Hardware-dependent simulation disabled.

  • HITL enabled: Hardware-in-the-Loop simulation enabled.

  • SIH enabled: Simulation in Hardware enabled.

The vehicle will enter . For multicopters this means the vehicle will hover, while for fixed/wing the vehicle will circle.

The vehicle will enter . Return behaviour can be set in the (below).

The vehicle will enter , and land immediately.

The Geofence Failsafe is a "virtual" cylinder centered around the home position. If the flight controller detects a situation where the vehicle is on a trajectory to move outside of the cylinder (an "impending breach"), then the specified will trigger.

Auterion Mission Control supports more complicated GeoFence geometries with multiple arbitrary polygonal and circular inclusion and exclusion areas in: .

If the action is set then the hold location is positioned such that it will not cause a geofence violation. For fixed wings this means that the center of the loiter circle is set more than the loiter radius away from the geofence boundary.

If action is set then there is no guarantee that the vehicle will not violate any geofence on its return path.

causes a vehicle to fly at a safe height to a safe destination, where it may loiter and/or then land. This section allows the return height, and landing behaviour to be specified for rally point and home location landings.

Planning > GeoFence
Hold mode
Return mode
Return mode
Failsafe Action
Hold mode
Land mode
Return mode
Return Home Settings