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92 Maintenance
Cleaning the door air inlets (IP42)
WARNING! Use a vacuum cleaner with an antistatic hose and nozzle, and wear a
grounding wristband. Using a normal vacuum cleaner creates static discharges
which can damage circuit boards.
Check the dustiness of the air inlet meshes. If the dust cannot be removed by vacuum
cleaning from outside through the grating holes with a small nozzle, proceed as follows:
1. Recommendation: De-energize the fans by switching off the DC/DC converter unit.
obey the instructions in section
2. Remove the fasteners at the top of the grating.
3. Lift the grating and pull it away from the door.
4. Vacuum clean or wash the grating on both sides.
5. Reinstall the grating in reverse order.
2
Electrical safety precautions
3
on page 66.
4
5
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