Good Morning!

Okuma & Howa Act2SP-2 with a Fanuc OT Control. We are getting a 920 Watch Dog Timer alarm. However, the alarm is very intermittent. Once the alarm occurs, we can power the machine down and bring it back up and the alarm goes away. The machine may run a few minutes or a few hours.

Has anyone encountered such a problem and if so, what would you suggest? The manual suggests that the problem is a servo system problem but it doesn't really help in pinpointing if the problem is in the drive or in the main control.

Any help would be appreciated.

Thank you,

Gary