Siemens Automation System S7-400 - Manual (Page 36)

Installing the S7-400
2-20
Automation System S7-400 Hardware and Installation
A5E00850741-01
2.8 Changing the Ventilation with the Cable Duct and Fan
Subassembly
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. To do this, proceed as follows:
1. Using a 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. Grasp the base with both hands; press it gently downward and pull it fully out of
the cable duct or fan subassembly.
3. The base cover is secured with clips. Firmly press down the cover in the clip
areas to remove it.
4. Snap the cover into the snap-in hinges at the rear edge of the base, rougly at a
right angles to the base.
5. Slide the base in again and push it up.
6. Use a 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.