9.1.12 Servicing the external fan
WARNING
Rotating or live 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 mains,
particularly before opening the terminal box. Make sure that the device cannot be switched
back on.
Servicing the external fan
The external fan is essentially maintenance-free. 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 discharge rate is only achieved if the inward flow to the impeller is unrestricted.
● Therefore, a clearance of at least 1 x inlet diameter must be provided in the axial direction.
● An unbroken uniform gap must be maintained between the impeller and the inlet nozzle.
Servicing the external fan motor
● Perform an occasional visual inspection of the external fan motor and check it electrically
and mechanically every time the roller 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.
9.1.13 Touch up any damaged paintwork
If the paint is damaged, it must be repaired in order to protect the unit against corrosion.
Note
Paint system
Contact the Service Center (Page 155) before you repair any paint damage. They will provide
you with more information about the correct paint system and methods of repairing paint
damage.
Maintenance
9.1 Inspection and maintenance
SIMOTICS TN Series N-compact 1PQ8
Operating Instructions 11/2018 119
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