Problem with servo SV32 (D10A), always yellow ;;

[michel@riazuelo.fr]

Hello everyone,

I have been flying for over 10 years with a D10A and an SV32 servo for roll.

During installation and testing, I had no experience with autopilots and, fearing that the autopilot would overpower me, I set the torque to 60%. It worked perfectly, with the yellow slip indicator rarely coming only on heavy turbulences.

Since a few flights, the slip has become frequent, and during my last trip, the autopilot became unusable.

I set the torque value to 100% and did a test flight, but the indicator is still yellow and the aircraft is no longer being piloted.

Must I conclude that this high-quality servo is out of order and needs to be replaced, or is it perhaps repairable?

Thank you for your answers...

 

[jakej]

Maybe the shear screw is broken?

 

[michel@riazuelo.fr]

Thank you, Jake.

I plan to check that this afternoon ...

 

[michel@riazuelo.fr]

Hello everyone,

Unfortunately, the shear screw is not broken!!!
However, I did a ground test that could help (experts) find the cause of the problem.

When I engage the autopilot, you can hear that the servo becomes active, it locks the stick, but the slip indicator turns yellow 1 or 2 seconds after engagement with no effort on the stick and therefore zero torque for the servo.

Does anyone have an explanation?

Merci par avance ...

 

[Rhino]

Could be a bad motor. Do you have another servo you could swap it with?

 

[michel@riazuelo.fr]

Hello everyone,

I don't have another servo...
If the motor was faulty, it wouldn't lock the stick when the autopilot is engaged.

It might be a software problem... but there are no DSAB messages.

I'm going to redo the entire installation, just in case.

I'd really like someone from DYNON to take a look at it.
Does anyone know if it's possible to do a standard exchange?

Thanks in advance...

Michel

 

[Rhino]

You should contact Dynon and ask them that.

 

[jakej]

Most likely not a wiring problem -
if the network wires were incorrectly installed then you would get a message telling either 1 & 6 or 4 & 8 needs sorting & power/ground are good because it will power up & ‘lock on’ as you indicated.
Are you able to swap servos (assuming you have roll & pitch) ?