Good day all.
I have an ABB s4 m98 irb1400 and a problem i have never encountered before. The system is stopping everything and coming up with a message "power supply fan not running" then "backplane enable OPEN" shows up. Started intermittently and now stops everything a few seconds after the motor is turned on. Tried a few different fans on power supply and all blow and work full time, yet, still same message. Any suggestions what next to try without putting more money into a old machine.
Thanks if anyone can help.