IMac shuts down itself (or log off) when I leave it  even if working

My iMac shuts down itself when I leave it for a few minutes even if working, just as example, when rendering a movie. Every time I leave the computer for more than 30 minutes, I come back and I find the first screen. (actually I don't know if the iMac shuts down or just log off)
Anybody knows ?
Thanks
Max

Hi Max
Welcome to Apple Support Communities
There are two levels of sleep, Display Sleep and Computer Sleep.
Go to: Apple > System Preferences > Energy Saver > and set Computer Sleep to Never and Display to Sleep after 10 or 15 minutes. That way the Computer will stay awake, but the Display will Sleep if your not sitting there doing something on it.
Also if you want to disable the password after Computer Sleep, go to System Preferences > Security > General and uncheck the Require password box.
Dennis

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