Installing the S7-400
2-20 AutomationSystem S7-400 Hardwareand Installation
A5E00850741-01
2.8 Changing the Ventilation with the Cable Duct and FanSubassembly

Changing the Ventilation

At the base of the cable duct and the fan subassembly,there is a cover that you
can move in order to modify the air duct. Todo this, proceed as follows:
1. Usinga screwdriver, make a quarter turn counter-clockwise to open the two
quick-release locks at the front of the cable duct or fan subassembly.
2. Graspthe base with both hands; press it gently downward and pull it fully out of
the cable duct or fan subassembly.
3. Thebase cover is secured with clips. Firmly press down the cover in the clip
areas to remove it.
4. Snapthe cover into the snap-in hinges at the rear edge of the base, rougly at a
right angles to the base.
5. Slidethe base in again and push it up.
6. Usea screwdriver to make a quarter turn clockwise and close the two
quick-release locks.
The following figure shows both methods of selecting the ventilation by
appropriately fitting the cover in the base of the cable duct or fan subassembly.