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Siemens Automation System S7-400 User Manual

Page 162

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Maintenance

7-14

Automation System S7-400 Hardware and Installation

A5E00850741-01

7.8

Replacing Fans in the Fan Subassembly During
Operation

Removing the Fans

1. Use a screwdriver to make a quarter turn counter-clockwise and open the two

quick-release locks on the front of the fan subassembly.

Fan 1

Fan 2

Fan 3

LEDs: F 1 = Fan 1

F 2 = Fan 2
F 3 = Fan 3

Quick-release locks

Reset button

Base

2. Grasp the base with both hands, press it down slightly and pull it fully out of the

fan subassembly.

3. Release the fan to be replaced by pressing the fan grip away from the housing

with your thumb.

Fan

Base

Fan grip

4. Pull out the fan to be replaced.