Random Climbs in Auto - Solved

ArduCopter Copter 3.5
1

Hi,
I have an issue with my Hexacopter (AC 3.5.7) where it is climbing randomly during an auto grid.
The aircraft is reaching a waypoint, then shortly afterwards it is receiving a commanded climb and then descend back to normal height (aircraft slows then stops during this climb/descend). On other points during the mission, the aircraft will simply pause for a while (10 - 20 seconds) before moving on.

.BIN and .tlog files are:

Copter%20Climb
Copter Climb.JPG1495×600 180 KB

At this point I can see the target altitude climbing and descending, but no clue as to what is causing it.
Any help would be greatly appreciated!

Thanks,
Andrew

2

Anyone have any thoughts on this?
I’m hesitant to simply fly the aircraft again without knowing what the likely cause was.
Thanks,
Andrew

3

Your Z-axis vibrations levels are very high. In fact I don’t think I have seen an accelerometer clipping level as high as yours (>7000). Get control of that 1st.

4

Thanks Dave, I will look into that. I guess the vibration wouldn’t be the cause of the climbing though, as the target altitude is increasing?

5

High vibes can cause altitude instability but you are right that target altitude (Dalt) is close to actual (Balt). I think I would still address the vibe issue and then try again.

6

Just letting all that read this know that the issue was resolved by fixing the vibration issues.
Thanks for your help Dave!
Cheers,
Andrew