My problem is main circuit breaker trips after program end on Fanuc OMD. Pls. help!!!
We have a vertical milling machine made by Primero,Taiwan.
One thing more, we are getting alarm 945 before the main breaker trips.
What is F171.0 on ladder diagram? Because when I set it on 0 when the program end the main breaker not tripping, but when we switch off again the problem coming back, Pls. help. I'm still new in troubleshooting in CNC machine. Thanks in advance...

What part of the program is it tripping out on? Have you tried to single block it and see if it is the M30 or the spindle stop ect.

Are you actually changing a part of the ladder at F171.0 in order to stop the problem?? What part of the ladder gives the option to change it to 0?? It appears that maybe its not reading a signal.

Alarm 945 is a communication error in the first serial spindle. Means a few things.
The memory printed--circuit board is defective.
The cable between the memory printed--circuit board and optical I/O link adapter has a broken wire or is unhooked.
The optical I/O link adapter is defective.
The fiber optics cable has a broken wire or is unhooked.
The serial spindle amplifier is defective

If your getting it at your program end I would suspect something more simple that is the problem.

Stevo

(The opinions in this post are my own and not those of machinetoolhelp.com and its management)

There is an option for energy saving on some machines, when you are running "lights out" if the option is set' it can be programmed to trip at the end of the last workpiece.

Dont know for sure, but it might be worth looking into.