Siemens SIMOTICS HV M, Operating Instructions Manual, Page: 96 / 136

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 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.
9.1.12 Maintaining the anti-condensation heating
The anti-condensation heating is maintenance-free. If it is defective, it can be replaced. In this
case, please contact the Service Center (Page 121).
9.1.13 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
terminal connections.
● If dust or humidity have infiltrated the terminal box, this should be cleaned and dried
(particularly the insulators).
Check all the seals and sealing surfaces and address the cause of the leakiness.
Maintenance
9.1 Inspection and maintenance
SIMOTICS HV M 1RN76308PR900CG0-Z
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Operating Instructions 07/2018