Maintenance
7-14 AutomationSystem S7-400 Hardwareand Installation
A5E00850741-01
7.8 Replacing Fans in the Fan Subassembly DuringOperation

Removing the Fans

1. Usea screwdriver to make a quarter turn counter-clockwise and open the two
quick-release locks on the front of the fan subassembly.
Fan1 Fan2 Fan3
LEDs:F1=Fan1
F2=Fan2
F3=Fan3
Quick-release locks Reset button
Base
2. Graspthe base with both hands, press it down slightly and pull it fully out of the
fan subassembly.
3. Releasethe fan to be replaced by pressing the fan grip away from the housing
with your thumb.
Fan
Base
Fangrip
4. Pullout the fan to be replaced.