If I connect the ESC directly to the receiver I got it to work, but when I connect it to the power distribution board of the pixhawk it either constantly beeps or does nothing.
Any tipps on wireing and software to get it working? (I tried changing PWM_Ratings but sowhow it seems not to work)
You can connect it to any ground pin, they are all connected. Although, inside the ESC the main ground and the signal ground will be connected so the additional ground in the JST connector is usually redundant.
Sorry I missed this earlier. You will need to connect the FMU PWM line as well. I’m not sure what settings you’re referring to - Once you’ve used QGC to tell it the basic configuration, set up your radio channels including an arm switch, and then calibrate the ESCs. After that the motors should work. When you switch it on you should get the happy sound, then you need to press the safety switch on the GPS unit until it double-flashes, then you should be able to arm it.
I am stuck when calibrating the ESC. If I follow the instructions the motors should spin when calibrating but they don’t move. I also tried connecting to the corresponding motor pinouts but no change there.
I mean the parameters like MAX_PWM and so on, what would you change there?
It doesn’t really matter where on the PMB you attach it - all of the grounds on the PMB are connected together. I used the main ground, but I had a separate power harness so it was an easy choice. Any of the PWM ground pins, or main grounds, or the CAP & ADC ground pins.