PrintMaster 52-1 Problem - Machine stops working after 15 minutes

Hi all, I just bought a used pm 52-1 but I am unable to use it since the machine stops responding after about 15 minutes of turning it on. Even if I just turn on the machine without using it or doing anything, after 15 minutes I hear a sound like a conductor switching on and off and immediately the red error LED on the main panel turns on. After that I cannot do anything on the machine. If I turn it off and wait for 10 minutes and then turn on again the error goes away and the same happens after again a few minutes.

Does anyone have any idea what could be the cause? Does anyone have a service manual and can check if it mentions anything?

 

make sure all your three phases are okay if one is down this would cause the problem