Oce CS120 Reference Manual page 93

If the copier is left untouched for a specified period of time after a Copy job or a key
input, the copier will automatically lower the temperature of the fixing unit and go
into the Energy Saver mode. This is called the Auto Energy Saver function.
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NOTE
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The default setting is <30 min.>.
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If no key is pressed for a certain period of time when the copier is in the Ready
mode or the Energy Saver mode, it will automatically turn off. This is called the Auto
Power-off function.
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IMPORTANT
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When the copier's power is turned off by the Auto Power-off function, scanned texture
patterns and scans of text originals made for copying using the Character Composition
function are lost.
Such settings stored in mode memory or the memory of the Recall key are also lost.
➔ ➔
Setting the Timer