Strange ESC disarm issue

[UrbanFPV]

So this is one I've not come across before.  ESC is a Wraith32 metal 66A with Blheli32 32.3.  Configuration is all failsafes off, a servo tester (PWM) is connected directly to the ESC so no autopilots in the way.  Gradual throttle deceleration is fine and throttle responds normally.  However, rapid throttle deceleration say from 1500 to 1300us causes ESC to disarm.  Bringing throttle back to 0 rearms and the ESC will behave itself again until there's another rapid throttle decel. RC Throttle cal is disabled.

3 Wraiths have been tried but it does it on all of them.

Anyone ever come across an issue like this on an ESC?  I suspect this issue is unique to the Wraith.

[Cheredanine]

As far as I am aware there is no disarm on the esc, you mean it stops?
What protocol are you using? Those ESCs are really designed for dshot, or high speed pwm, the caps used are specified for that
(An esc which is designed for conventional pwm - 1000-2000ms sees those signals as noise)

Would recommend if you want to run PWM you need a more appropriate ESC such as blheli or blheli_s at the most (not saying blheli32 won’t run pwm, but it is not what the hw is designed for

Also if three ESCs behaved in that way I would question the servo tester

[UrbanFPV]

Further investigation shows it's active damping that's the problem.  Flashing to 32.4 which allows turning this off makes the problem go away.  This shouldn't be an issue really as there's no load on the motor at this point.  Servo tester isn't the problem as it does the same thing connected to an autopilot - hence why we bypassed it completely with the servo tester.

Basically, when it happens the ESC makes two beeps (as if starting to arm), but only makes the 3rd beep when the throttle is reduced to 0%.  As soon as the two beeps happen, throttle control is disabled until reducing to 0 again.

DSHOT isn't an option.  We need the current/voltage rating and this esc appeared to be a unicorn ESC.  Size/Weight/Current/Voltage.

[atomiclama]

Can you hook them upto a spare FC and run it on another protocol and update rate?

If you do a rapid change with the PWM tester due to the low update rate the ESC will one signal at 1500 and the next at 1300 which is a huge step for an ESC, which is designed for fast update rates so small steps, to handle.


Scrap my comment  then  ::)