I have built a S550 Hex running Sunnysky 3108 720kv motors. I have a UBEC in channel 8 and all ESC's have all three wires connected to the Pixhawk. My Pixhawk is brand new.
The Spider 30A ESC's calibrate fine and do not exhibit any throttle issues in the calibration mode, I have heard a short grinding noise from one of the motors which leads me to think I may have a sync issue as well?
When I arm the Pixhawk and throttle up, the throttle doesn't respond to my input but instead starts a slow ramp up that doesn't seem to be responding to any of my adjustments, just a slow ramping up.
I am getting very frustrated trying to get any ESC's to work with my Pixhawk. I have tried generic simonK ESC's, HobbyKing 20A UBEC ESC's and now these Spider OPTO ESC's, all of them have calibrated fine only to exhibit a variety of sync and throttle issues when armed.
Any advice would be greatly appreciated.