T30 Battery Output High

Error displayed on RC stating “Battery Output High Forced Landing In Progress”

Cause:

There are potentially many possible causes for this issue;

• The most likely cause is a bad ESC on Arm 3

1. What we believe is that the T30s were made during COVID and due to labor shortage DJI quality control (as well as everyones) took a drop and the components used in ESCs were not as good as we typically see in DJI products.
1. Environmental Factors
   1. Hot temperatures - usually see this as a summer time issue
   2. High density altitudes - see this during summer when temps are high, or if someone is operating at high elevations (like mountain areas).
2. Field Size/Shape
   1. Operating in small areas, a lot of accelerating/decelerating/ shifting side to side.
3. Long ferry flights to the starting point.

Diagnosing:

Troubleshooting steps are as follows;

1. Rule out ESC error
   1. From operations screen
      1. Select top left of screen (where it would say Manual GNSS)
      2. Select Real Time Diagnosis 
      3. Select History
      4. Scroll through errors during the time of battery output error and look for anything related to ESCs or Motors.
2. Determine possible environmental factors
   1. Ask about the flight when issue occurred;
      1. Temperature?
      2. Wind conditions (strong or light)
      3. Altitude they are flying at?
3. Determine possible issue with operation area
   1. What condition of flight did the error occur (beginning, middle, end of mission)
   2. Was the mission in a finger like area where the drone is accelerating and decelerating a lot.
   3. Ferry flight, was the drone flying a long distance?
4. Payload;
   1. How much product was in the tank? (Full, half, empty)
   2. What product are you spraying

1. Foliar fertilizers weigh more than water, therefore the drone weighs more than it normally does.
   1. This adds extra stress to the drone and the components.

Solutions:

1. If ESC issue is confirmed
   1. Replace ESC with newer T30 version
2. Environmental Factors
   1. Reduce payload
   2. Cool batteries and chargers while using
   3. Fly on different day
   4. Fly at night
3. Operation Area
   1. Try to fly longest axis in finger ares
   2. Avoid ferry flights with full tanks
   3. Try flying drone backwards manually to start poin\
      1. This provides less work for Arm 3 to overcome CG 

• Payload (usually solves issue for short term to get through operations)

• Reduce payload to 6 gallons and no more!

• When reducing payload do one of the following options;

• Reduce route spacing to 25ft

• Reduce rate to 1.8gal/ac if route spacing is 27ft

Conclusion:

This issue is mostly experienced in hot temperatures during the summer (can be experienced outside of summer, just less likely). It is typically related to ESC 3 issues of some sort. Reducing payload usually will result in the drone avoiding this issue, and can be used as a temporary solution until a new ESC is installed. Sometimes using dielectric grease can help this issue as well but not typically.

Most likely cause for this issue is poor quality control on parts manufactured during COVID era in China. DJI has not confirmed this and probably never will but ASD believes this to be the issue considering we have seen two drones operating side by side and only one will ever land. This rules out environmental factors like DJI like to claim is the issue.