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9.6.12
Servicing the external fan
Injury caused by rotating parts or live (under voltage) parts
Live electrical parts are dangerous. Contact with them can cause death, serious injury or
material damage.
• Before carrying out any maintenance work on the external fan, disconnect it from the
• Make sure that the device cannot be switched back on.
Servicing the external fan
However, dirt and dust deposits on the impeller and the motor, particularly in the gap between
the impeller and the inlet nozzle can impair its function.
• Remove the dirt and dust deposits regularly; the intervals depend on how dirty the
surrounding area is.
• Make sure that the impeller is cleaned evenly, as irregular deposits can lead to an imbalance.
• The full air flow can only be achieved when air can freely flow through the impeller.
• There must be a clearance of at least 1 x air intake diameter in the axial direction.
• A uniform gap must be maintained between the impeller and the air intake assembly.
Servicing the external fan motor
• Perform an occasional visual inspection of the external fan motor and check it electrically and
mechanically every time the rolling bearings are replaced.
• Replace the permanently lubricated rolling bearing on the external fan motor after
40,000 operating hours or five years at the latest.
9.7
Corrective maintenance
9.7.1
Reference to chapter Safety instructions
Observe the following when carrying out any work on the machine:
• Comply with the general safety instructions (Page 113).
• Comply with the applicable national and sector-specific regulations.
• When using the machine within the European Union, comply with the specifications laid
down in EN 50110‑1 regarding safe operation of electrical equipment.
If the motor has to be transported, please observe the information and instructions in the
"Transport" chapter.
1FU9
Operating Instructions, 07/2020, A5E46712792A
WARNING
mains, particularly before opening the terminal box.
Maintenance
9.7 Corrective maintenance
99
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