No change in PWM signal

hope you can help me with this. I have set up a erlebrain 3 with the newest ardurover firmware and I have Mission Planner 1.48.3 on my PC. I think I set it up alright. If I now enter a waypoint and read it, or with a configured xbox controller try out movements, the PWM signal does not change it is the same everywhere. Actually, the autopilot should be armed and do something. Do I have to adjust somewhere before? I hope someone can help me with the vague description. I only want a change in the PWM signal. That would be a great.
Regards luegenbar0n