THR_DZ doesn't work in Loiter

hassani · May 22, 2020, 10:09am

Hi,
I have large octa, I set THR_DZ and it works correctly on AltHold, but it doesn’t work in Loiter and PosHold modes. I set the throttle linear.

Thanks for your answers.

dkemxr · May 22, 2020, 2:03pm

What do you mean “I set it”? Typically the default of 100 us doesn’t need to be changed.

hassani · May 22, 2020, 2:55pm

It doesn’t work with the default value of 100 in Loiter and Poshold,
while it’s in the deadzone range, octa will climb or descend with any low stick change.

dkemxr · May 22, 2020, 3:53pm

Then it could be another issue. Post a link to a .bin flight log for when this occured.

hassani · May 24, 2020, 9:45am

Hi Dave, my log file:
https://gofile.io/d/MmDXAX

dkemxr · May 24, 2020, 1:49pm

It looks over weight/under powered to me which will provide poor stability control. Your average motor output at hover is ~1800µs.

hassani · May 24, 2020, 7:52pm

Thanks Dave.
But i didn’t understand exactly, Is this the reason for the deadzone’s problem? why?

dkemxr · May 24, 2020, 11:24pm

Its the reason for many stability problems. You have no thrust headroom for control. PWM should be ~1500us at hover. Forget about a minor issue at hover, you have bigger problems.