Maintenance
7-16
S7-400 and M7-400 Programmable Controllers, Installation Manual
C79000-G7076-C424-01
7.9 Replacing the Filter Frame of the Fan Subassembly During
Operation
Replacing the Filter Frame
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.
2. Grasp the base with both hands, press it down slightly, pull it first fully forward
and then up at an angle out of the fan subassembly.
3. The filter frame is secured either in the bottom of the base or at its rear edge
with snap hinges and snap catches. The individual filter mats are joined with the
filter frame.
Remove the filter frame as follows:
– The filter frame is fitted in the bottom of the base:
Near the snap catches, press against the filter frame from below and
remove the filter frame.
– The filter frame is secured at the rear edge of the base:
With the flat of your hand, press the filter frame away from the base of the
fan subassembly. This will release the filter frame from the snap hinges.
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