Siemens Automation System S7-400 - Manual (Page 164)

Maintenance
7-16
Automation System S7-400 Hardware and Installation
A5E00850741-01
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.
Filter frame
Cover
Quick-release locks
Base with cover and filter
frame (optionally fitted at
bottom or rear)
Snap catches
Snap hinges
Filter mat