Maintenance
9.2 Inspection and maintenance
1LE7 shaft heights 71 ... 315
Operating Instructions, 04/2022, A5E51689275A-AA
97
9.2.12
Servicing the separately driven fan
WARNING
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 separately driven fan, disconnect it
from the mains, particularly before opening the terminal box.
•
Make sure that the device cannot be switched back on.
Servicing the separately driven 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 separately driven fan motor
•
Perform an occasional visual inspection of the separately driven fan motor and check it
electrically and mechanically every time the rolling bearings are replaced.
•
Replace the permanently lubricated rolling bearing on the separately driven fan motor
after 40000 operating hours or five years at the latest.
