Maintenance
6.3 Corrective Maintenance
A5E01083943A AB
Siemens AG Operating Instructions 2.02 1FW4
83
way that the height of the shaft journal is less than 0.1 mm when rotating the rotor. Install
the outer bearing cover with contact guard.
5. Install the new sensor.
6. Install the torque counteracting support of the sensor.
7. Insert the connector into the socket.
8. Press the cable into the holder provided for it.
9. Screw on the sensor cover. Take care that you do not catch the cable as you screw it in.
10. Screw on the fan cowl.
Note
Identifying the position of the rotor
After replacing the sensor, you must start a rotor position identification (automatic sensor
calibration) via the converter's motor module.
[ID 1138.00]
6.3.4 External fan
Preparatory steps
WARNING
Before starting any work on the fan, the device must be disconnected from the line supply
and secured so that it cannot be switched on accidentally. Do not reach into the fan until
the impeller has stopped turning.
Use a pulling device to pull the impeller off the motor shaft after the center mounting screw
has been removed. Avoid stressing the bearings by heavy blows to the wheel or motor shaft.
Fan cowl
Before the fan cowl is removed the terminal box for the speed sensor should be completely
unscrewed so that it is not necessary to undo the connections.
The fan cowl is made of sheet steel and welded together. When installing the sheet steel fan
cowls, make sure that the retaining components are correctly installed. Also check that the
gap between the fan impeller and the air guide nozzle is even (≥ 2 mm).
Welded hub
A ring-shaped groove is provided in the impeller hub for attaching commonly available types
of pulling device.
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