have tried this twice...
once with XRC...replacing the fan solved the problem....
but....
with my Nx100, i couldent (and have still not) solved the problem. I have replaced it with a brand new fan from MOTOMAN (and seen that it is running perfect)....so i guess that the input that is mesuring the rpm on the fan might be blown.
after 8 hrs of continuesly running the robot stops, and i have to power off and power on the controller.....