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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
● Make sure that the impeller is evenly cleaned, as irregular deposits can lead to an
Servicing the external fan motor
● Perform an occasional visual inspection of the external fan motor and check it electrically
● Replace permanently lubricated roller bearings in the external fan motor as specified in the
9.1.7.9
Maintaining terminal boxes
Requirement
The machine is de-energized.
Checking the terminal box
● Terminal boxes must be regularly checked for tightness, undamaged insulation, and tight
● If dust or humidity have infiltrated the terminal box, this should be cleaned and dried
● Check the insulators, connectors and cable connections in the terminal box.
● Replace the damaged components if necessary.
LOHER CHEMSTAR 1PS5
Operating Instructions 03/2014
surrounding area is.
imbalance.
Note
Flowrate
The full flowrate is only achieved if the inward flow of air to the impeller is unrestricted.
and mechanically every time the roller bearings are replaced.
operating instructions for the external fan motor.
terminal connections.
(particularly the insulators).
Check all the seals and sealing surfaces and address the cause of the leakiness.
WARNING
Short-circuit hazard
Damaged components can cause short circuits, possibly resulting in death, serious
injuries and property damage.
Replace damaged components.
Maintenance
9.1 Inspection and maintenance
95
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