Chapter 17: System Failure
      Back to home
      1. Help Center
      2. XAG Drone and Systems Technical Specification
      3. Chapter 17: System Failure

      Chapter 17: System Failure

      System Failure

      Flight Events

       

      Related to INS (Intelligent Navigation System)
       

      Critical events
       

      Flight Control response failure

       

      No. Event_uuID System Failure en_event What even triggers this error? Flight Operation What is the Aircraft automatic behavior? App Error Display Recommendation
      1

      47ba331e-1505-45cb-aa01-33d96a7b7051

      		 Electric Battery over discharge Battery over discharge/emergency landing take place Autonomous flight, Manual control Hover and land immediately Battery over-discharged, please change battery(1003) Please use the battery properly and contact after sales service if it occurs repeatedly.
      2

      c493a5a3-57bc-46f2-992e-6a2cef3f5a95

      		 navigation RTK position malfunction Geographic position error after re-entering RTK Autonomous flight, Manual control Hover and wait for manual remote control for 120s. After 120s, UAV will land on the hovering position Abnormal positioning, please take over manually, or forced landing(1004)  
      3

      0b0e5749-5599-4c86-ba7c-aca89738636e

      		 Propulsion Propulsion system shutdown due to tile angle reach its limits tile angle reach its limits during flight Propulsion system shutdown Angle too large Aircraft crashed, please contact the service station.
      4

      d0dc4303-ce5a-45e7-adb3-542fba0dd9cb

      		 Propulsion Propulsion system shutdown due to control failure Control failure During flight Propulsion system shutdown Control error Stop the Aircraft 
      5

      7d816ff3-5fef-4e93-83aa-b6e81ede3f09

      		 Propulsion ESC malfunction ESC malfunction during flight Propulsion system shutdown Motor error Stop the aircraft
      6

      569f377f-95d1-479f-b785-00988f93e298

      		 navigation GPS Malfunction GPS malfunction, Optic flow OK Autonomous flight if remote control is not involved, UAV will hover in the sky and wait for 120 seconds unless GPS recovery or remote controller command. If GPS fails to recover, then UAV will be forced landing. GPS Error(1008)  
      7

      2244bf51-c697-4cd8-a1f5-fe513eff60cd

      		 navigation Unable to detour when encountering obstacles Unable to detour when encountering obstacles Autonomous flight, Manual control display errors on App/ UAV hover Cannot bypass the obstacles above, please take over or use Tap&Go(1010)  
      8

      5faa6f86-50a4-4a03-bb11-f60d349b8fd2

      		 navigation Terrain radar error during takeoff Terrain following mode is enable but meanwhile terrain radar malfunction Autonomous flight, Manual control not allow to takeoff/ forced landing Terrain radar malfunction, please pay attention to the flight height(1012)  
      9

      83efd637-e133-427c-89a9-458cc18db145

      		 electric ESC check failure motor speed abnormal during take off take off, idle test Propulsion system shutdown ESC error detected, please restart the device(1015)  
      10

      bbf5b8ec-f7e4-4913-a9c5-4472a92d8c63

      		 navigation NAV offline no control output(GPS, acceleration, speed attitude) Autonomous flight display errors on App/ UAV hover NAV offline, please take over the aircraft with ACS2  
      11

      c7b89d70-c4f0-43a9-b4a9-e4e406af4795

      		 system Flight control offline N/A Autonomous flight, Manual control Display errors on App/UAV hover Flight controller offline Please try any of the following instructions:
      1. Turn off the aircraft, remove the UPS cable from the flight controller and restart the aircraft.
      2. If the above does not work, please contact the customer service.
      12

      cbe22f5e-c6d2-494a-be99-c47936c

      b0cae

      		 system TPS(task program system) offline not receiving TPS command  for more than 3 seconds Autonomous flight, Manual control display errors on App/ UAV hover/ resume the operation when recovery Flight control TPS data not updated Restart the device
      13

      0c55b755-3325-4949-a50d-6f7137600121

      		 propulsion Overloaded,please reduce payload Overloaded Autonomous flight, Manual control Forced landing Overloaded, please reduce payload Please try any of the following instructions:
      1. Try to reduce payload.
      2. Check whether the structural parts in the propulsion system are deformed or broken, including propellers, motor bases, steel sleeves, and rubber sleeves.
      3. If all else fails, please contact the service station.
      14

      e8821745-ec5a-4d3d-bfce-c9790e5df36a

      		 propulsion Aircraft crashed Aircraft crashed detected Autonomous flight, Manual control Display errors on App Aircraft crashed  N/A
      15

      3f4b5d59-a143-478e-a6aa-3e89c834f990

      		 propulsion insufficient power(M1) payload overweight Autonomous flight, Manual control Forced landing Insufficient power(M1). please reduce payload Please try any of the following instructions:
      1. Try to reduce payload.
      2. Check whether the structural parts in the propulsion system are deformed or broken, including propellers, motor bases, steel sleeves, and rubber sleeves.
      3. If all else fails, please contact the service station.
      16

      81ffc939-f069-483d-aa2f-b30df39b39c8

      		 propulsion insufficient power(M2) payload overweight Autonomous flight, Manual control Forced landing Insufficient power(M2). please reduce payload
      17

      437b7545-94cd-4e3e-94d5-830ac58605f9

      		 propulsion insufficient power(M3) payload overweight Autonomous flight, Manual control Forced landing Insufficient power(M3). please reduce payload
      18

      16b1097b-32d1-489d-834d-b73ae67617ab

      		 propulsion insufficient power(M4) payload overweight Autonomous flight, Manual control Forced landing Insufficient power(M4). please reduce payload
      19

      fe2b1828-9d08-40c3-886c-cc4cf887e05d

      		 propulsion Servo or motor self-inspection failure hardware condition Autonomous flight Stop the aircraft and reject to take off Servo or motor self-inspection failure, please restart the device(1043) Restart the devices
      20

      09dcd7e5-a404-4fae-9f5c-32e8e36cc443

      		 navigation tilt angle Composition error  tilt angle Composition error Autonomous flight, Manual control Recovery, forced landing or crash Navigation error, waiting for recovery (1044) Keep safe distance from UAV
      21

      09dcd7e5-a404-4fae-9f5c-32e8e36cc443

      		 navigation vertical Composition error vertical Composition error Autonomous flight, Manual control Recovery, forced landing or crash Navigation error, waiting for recovery (1045) Keep safe distance from UAV
      22

      09dcd7e5-a404-4fae-9f5c-32e8e36cc443

      		 navigation horizontal Composition error horizontal Composition error  Autonomous flight, Manual control Recovery, forced landing or crash Navigation error, waiting for recovery (1046) Keep safe distance from UAV
      23

      09dcd7e5-a404-4fae-9f5c-32e8e36cc443

      		 navigation no position data no position data Autonomous flight, Manual control UAV hover within 5 seconds; if recovery, users can continue the flight mission. If not recovery, UAV will adjust its attitude and forced to make a landing. Otherwise UAV will stay hovering. Navigation error, waiting for recovery (1047) Keep safe distance from UAV
      24

      2f6b79a2-6488-43b0-b680-b632ba9255f7

      		 navigation position hopping RTK postion error is greater than 10 meters after RTK

      reinitialization

      		 Autonomous flight, Manual control UAV hover and wait for further commands, display errors on App Navigation position accuracy change, waiting for restoration. If restoration fails, aircraft will be forced to land, please keep a safety distance (1048) Aircraft is circling in

      attitude mode to wait for recovery, or it will be forced to land, 1 minute later.
      25

      cd004956-caec-42ae-95d9-61e3fd810ed7

      		 navigation GPS horizontal speed error GPS horizontal speed error Autonomous flight, Manual control If there is no higher priority actions involved and the error exceeds 5 seconds, UAV will stop moving and hover in position mode, waiting for 120 seconds. If there are no recovery or manual commands within the period, the UAV will be forced to make a landing. User can still control it manually during UAV landing. GPS speed error, aircraft will be forced to land (1049) Land
      26

      cd004956-caec-42ae-95d9-61e3fd810ed7

      		 navigation GPS vertical speed error GPS vertical speed error Autonomous flight, Manual control If there is no higher priority actions involved and the error exceeds 5 seconds, UAV will stop moving and hover in position mode, waiting for 120 seconds. If there are no recovery or manual commands within the period, the UAV will be forced to make a landing. User can still control it manually during UAV landing. GPS speed error, aircraft will be forced to land (1050) Land
      27

      dbb55cfd-0e02-402b-9ba3-257039595116

      		 navigation GPS heading error INS algorithm Autonomous flight, Manual control Within 15 seconds after UAV take off. UAV will hover and wait for further commands. Otherwise, UAV will resume flight mission. GPS heading error, cannot take off (1051) Please try any of the following instructions:
      1. Check whether the environment around the aircraft is open and unobstructed.
      2. Check whether the RTK antenna is worn or broken.
      3. If all else fails, please contact the service station
      28

      f129bb62-24ad-408c-ac48-f587263e9a5d

      		 navigation The barometer measurement error, GPS positioning OK but RTK offline The barometer measurement error, GPS positioning OK but RTK offline Autonomous flight, Manual control If there is no higher priority actions involved and the error exceeds 5 seconds, UAV will stop moving and hover in position mode, waiting for 120 seconds. If there are no recovery or manual commands within the period, the UAV will be forced to make a landing. User can still control it manually during UAV landing. Navigation error, aircraft will be forced to land, please keep a safety distance (1052) Land
      29

      f129bb62-24ad-408c-ac48-f587263e9a5d

      		 navigation GPS positioning OK but RTK offline GPS positioning OK but RTK offline Autonomous flight, Manual control If there is no higher priority actions involved and the error exceeds 5 seconds, UAV will stop moving and hover in position mode, waiting for 120 seconds. If there are no recovery or manual commands within the period, the UAV will be forced to make a landing. User can still control it manually during UAV landing. Navigation error, aircraft will be forced to land, please keep a safety distance (1053) Land
      30

      47e4d6a7-7c6e-4ffd-a0fd-bfba228bbcbd

      		 navigation Exceed the upper height limit to the ground Terrain module OK but terrain following mode is turn off, the UAV flight height exceed 30 meters Autonomous flight, Manual control continue flight mission, UAV stops climbing up, until UAV fly below the maximum allowable height Exceeded height limit, please be cautious (1054) ready to take over by remote controller.
      31

      03ceb744-57b2-41ea-8c45-e7abc3a267b9

      		 navigation Exceed the lower height limit to the ground Terrain module OK but terrain following mode is turn off, the UAV flight height is below 0.5 meters Autonomous flight, Manual control Forced to flight at the height of 1.5m Exceeded height limit, please be cautious (1055) ready to take over by remote controller.
      32

      47e4d6a7-7c6e-4ffd-a0fd-bfba228bbcbd

      		 navigation Exceeded height limit Exceeded the maximum permissible height, 200 meters in comparison to the UAV take-off point Autonomous flight, Manual control Continue flight mission, but restrict UAV flight height and report issues in App Exceeded height limit; flight height will be restricted (1056)

      N/A
      33

      50109dd4-f2f7-4b92-bb30-16176913822f

      		 navigation remote controller reaches the maximum flight speed remote controller reaches the maximum flight speed,

      5.8m/s

      		 Manual control Not restricted You are flying too fast, please be cautious

      N/A
      34

      d0d91de4-b4b4-48f8-8963-661b9b2913c7

      		 navigation Maximum flight distance reached The distance between UAV and remote control reaches the maximum horizontal distance, 2000 meters Manual control UAV will stop and hover at the edge of the maximum flight radius from remote controller. Maximum distance reached N/A
      35

      5faa6f86-50a4-4a03-bb11-f60d349b8fd2

      		 navigation Terrain radar malfunction during flight mission Under terrain following mode, terrain radar malfunction Autonomous flight, Manual control UAV will continue to fly without terrain following mode during flight mission Terrain radar malfunction, please pay attention to the flight height N/A
      36

      41049675-d85f-4976-acb9-8f88c5d52fa0

      		 C2 Link remote controller offline significant signal interference, bad signal strength, dead remote controller Autonomous flight, Manual control During manual flight, UAV will hover and land when the battery is low. During autonomous flight, UAV will automatically complete the flight mission.

      Please try any of the following instructions:

      1. Check if the remote controller is linked to the aircraft.
      2. Try to reconnect the remote controller and the aircraft.
      3. If all else fails, please contact the customer service

      		 NA
      37

      ef7d0f6a-e67e-40e3-a700-00c4f5bdbba4

      		 C2 Link remote controller not connected remote controller not connected Autonomous flight, Manual control UAV is allowed to fly autonomously without remote controller.
      UAV is not allowed to fly manually without the remote controller      		 Remote controller not connected connect remote controller

       

      Flight Safety Management

      Autonomous flight failure

       

      LNT/4G networking mode

       

      Question: If UAV loses GPS, how does UAV response?

       

      Answer: Depending on the situation, exception handlings could be different. In the extreme case that UAV lost all satellites, UAV will hover using optical flow. After hovering for 2 minutes, the UAV will be forced to land without manual control involved. if it is within autonomous flight mission, the UAV will stop spraying during hovering.

       

      Question: If UAV itself is abnormal, such as flight controller failure, etc., how does the aircraft response?

       

      Answer: Depending on the situation, exception handlings could be different. In the extreme case that flight control is complete dead, UAV will stop the motors to prevent fly-away.

       

      Question: If for some reason, the flight altitude of the aircraft is greater than the pre-defined maximum value, or less than the pre-defined minimum value, do any error prompts appear on the XAG One App?

       

      Answer: There will be no alarm.

       

      Question: When the height of the aircraft is less than the minimum altitude (currently 1.5m), how is the distance 1.5m being calculated? Is it through a terrain following radar, or RTK altitude positioning, or a barometer? If you encounter complex ground conditions (hills, trees, lakes, etc.) and the aircraft is flying in fast speed, this altitude may change over time, how is the minimum altitude determined?

       

      Answer: According to UAV flight setting, user can enable or disable terrain following mode. When terrain following mode is on, UAV will fly at the height that measured by terrain radar. Oppositely, when terrain following mode is off, UAV will fly at the fixed height that measured by RTK positioning system. UAV has the feature of flight protection, when the aircraft gets close to ground or crops, the terrain following mode will be triggered and enabled to prevent crashing or hitting.

       

      4G networking mode

       

      Question: How will the aircraft response if it loses WIFI communication?

       

      Answer: Once the aircraft loses WIFI communication, it will continue to operate using the 4G network.

       

      Question: How does the aircraft react if it loses both 4G and WIFI?

       

      Answer: Once flight route is uploaded to the aircraft, UAV will continue to complete the operation and return home according to its own status.

       

      Manual flight failure

       

      Question: If UAV loses WIFI signal, will the aircraft hover? Does spraying system stop automatically?

       

      Answer: The aircraft will hover for 30 seconds, and then automatically stop spraying and return home.

       

      Question: If the UAV is commanded to keep moving forward, will UAV exceed the communication distance? Will UAV hover if disconnected? Will the spraying stop immediately?

       

      Answer: the UAV will hover, but will not stop spraying, which means the original state will be persisted.

       

      Question: After the remote controller is disconnected from the aircraft, will the remote controller LED indication light response timely?

       

      Answer: The remote controller LED light indicator of UAV connection (3rd light from the left) will automatically become dim off, but it is not instantaneous, it needs to wait for about 10s~30s.

       

      Question: If the remaining battery of remote controller is low, will UAV automatically return home?

       

      Answer: Remote controller will shut down by itself if it reaches low battery (5%), the UAV will hover and wait for commands. If UAV does not receive commands for 120 seconds, it will automatically return home. If UAV battery goes low, it will be forced to land by itself.

       

      Question: After the UAV loses the GPS signal, will it hover and stop spraying automatically?

       

      Answer: After the aircraft loses the GPS signal, the aircraft will hover using optical flow and wait for GPS recovery. It will wait for 120 seconds. After 120 seconds, UAV will be forced to land and. As the UAV is under manual control mode, the UAV will not stop spraying (the firmware can be changed to over without spraying). Since the UAV optical flow is not accurate at an altitude greater than 7m, the UAV will lower its altitude less than 7 meters. The maximum altitude of the UAV is 30m.

       

      Question: Will spraying system stop automatically after the obstacle avoidance event is triggered by dynamic radar?

       

      Answer: Spraying system will stop automatically.

       

      Question: Will spraying system stop automatically after RTH (Return to home) is triggered?

       

      Answer: Spraying system will stop automatically.

       

      Question: If the UAV is malfunctioned during flight, will the spraying system stop automatically?

       

      Answer: Spraying system will stop automatically.

       

      Question: Will there be a voice prompt in addition to the indicator light with low power control with one hand? Can voice prompts be made into English?

       

      Answer: There are voice prompts, Chinese and English

       

      Question: Will the aircraft's dynamic radar and terrain following radar work in manual mode?

       

      Answer: The dynamic radar does not work during manual mode, but terrain following radar is subject to enable. Remote controller is allowed to turn on/off terrain following radar, where users can press the rise and fall button to control the height limitation in terrain following mode.

       

      Question: How can user control UAV via remote controller?

       

      Answer: Please read the ACS2 remote controller user manual. Generally, UAV manual flight speed can vary from 0.5m/s to 6m/s, where 0.5m/s per gear. Once press “S” button, Spread/spray system will turn on. Once turn-on, the spread/spray amount is at default 50% of maximum spread/spray amount. If press S+/S-, the amount will increase/decrease at 10% each press, the maximum spray amount varies according to each aircraft

       

      P40/V40, Maximum Flow Rate 10L/min P100, Maximum Flow Rate 12L/min

       

      Question: What is this criterion of GPS signal loss?

       

      Answer: GPS is OK if its accuracy control is within 1m.

       

      Question: What happen if GPS signal is weak?

       

      Answer: UAV can still fly but the flight path accuracy is low.

       

      Question: If the GPS signal is restored after loss, whether it will automatically resume spraying, or requires users to manually turn on the spray system?

       

      Answer: After the GPS signal is restored, the user needs to manually turn on the spray system.

       

      Return Home Trigger

       

      Question: Will the radar be turned on automatically when the aircraft triggers an automatic return home?

       

      Answer: It will not be turned on automatically, whether it is turned on or not depends on whether the radar is enabled when the user uploads the route. If the obstacle avoidance dynamic radar is enabled in the flight setting, the radar is enabled when the aircraft returns home. Otherwise, the radar is disabled.

       

      Question: If the UAV triggers automatic return to home, will the UAV slow down its flight speed?

       

      Answer: No. The return speed is based on the speed of entering and exiting the route set by the APP. It is recommended that the user set the entry and exit speed lower.

       

      Power Abnormality

       

      Question: Does UAV has any power redundancy to secure the flight?

       

      Answer: The UAV has no power redundancy. But if one of the motors has an abnormal speed, the other motors can quickly compensate. If the compensation goes off, the UAV will crash.

       

      Battery Abnormality

       

      Question: What happen if the smart battery is dead?

       

      Answer: the UAV will crash during flight as there is only one power supply source