I am facing an odd issue on one of my robots and I would like some feedback.
One of my production robots, an M710i with RJ2 controller is experiencing loss of power in a really strange manner.
The power loss happens during production cycles as well as idle times.
The power loss is not exactly a power loss, the teach pendant goes off, the operator panel LEDs go off and the servo amplifier also, but on the PSU board both PIL (green) and ALM (red) LEDs are active.
If I use the OFF switch on the operator's panel the ALM led on the PSU switches off and the OFF button seems to work as intended cutting the power to the controller. I can the restart the Controller using the ON button and the system boots up as it normally does. After a time period of 10 to 20 minutes no matter if on production or idle, same thing happens.
There is no alarm recorded.
There are no signs of over temperature.
Both system fans are clean and working on the backplane.
There are no alarms on the Main CPU board and the system otherwise behaves as intended.
There is no documented case on the FANUC RJ2 Controller maintenance manual to guide me on propable causes and corrective actions to take.
I could not find a similar thread no matter how hard I tried the search function and that makes me scared a bit.