Pulsed arc welding problem

MahmoudSaeed

2 days ago I programmed module to weld stainless steel pipes using pulsed arc welding method and it worked fine. But today with same parameters the robot stops welding immediately after striking arc with error message "RobotWare Arc Error .. Arc supervision signal not set .. check welding equipment".
I tried many values for touch sense current, hot start, electrode stick out length, electrode angle, arc length control, wirefeed speed and shielding gas parameters but the problem is still there.
Please tell me if I'm missing something.

Specs:
IRB 1600 ID manipulators with AristoMig500 Power source

Thanks in advance