930 CPU Interrupt

The 930 CPU Interrupt often occurs when there’s a disruption to the 5V logic supply. This is usually due to electrical noise in the machine or in the electrical panel. FANUC misleads you in the manual by suggesting replacement of the master board. This rarely solves the problem. This fault is almost always caused by problems in the grounding or electrical arc suppression of AC and DC devices. Often, the problem will not occur if you leave the machine in Estop after powering up. Once you take it out of Estop, hydraulics, etc come on and that’s when the problem usually occurs.

Searching and correcting electrical noise problems can painstaking and detailed. It is useful to have a storage scope on the 5V test pin on the CNC Masterboard and set the trigger level around 4V. If you observe a disruption while bringing up and dropping out magnetics, this is a problem. You’ll have to isolate and figure out which devices (relays, solenoids, contactors) are causing the problem.

The coolant system seems to be the most prevalant cause of many of these that I’ve seen. One must carefully check the suppression of DC relays (reverse biased diode across the coil) and also AC contactors (RC network across the coil and RC networks across the contacts).

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