Where can I find a manual about this power supply ?

Thanks

Hello S7-Freshman;

This would be a good time to learn how to use the resources offered by the forum.

A quick use of the Search box at the right of this page would have brought you to this thread

need manual PS S5 6ES5955-3LC14 

Follow the link provided by our friend Umencho.

Hope this helps,

Daniel Chartier