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Danger as a result of rotor falling out
If the motor is in a vertical position, the rotor can fall out while work is being performed on the
locating bearing. This can result in death, serious injury or damage.
● Support or unload the rotor when carrying out work with the machine in a vertical position.
9.2.2
Screws with preCOTE coating
The motor can partly be fitted with screws with preCOTE coating. To ensure screw locking, use
new screws with preCOTE coating during assembly/repair. As an alternative, use normal
screws with a threadlocker such as Loctite.
9.2.3
External fan
9.2.3.1
Replacing the external fan
If the external fan is defective, contact the Service Center (Page 171).
9.2.3.2
External fan unit
The external fan unit is mounted on the NDE in the housing attachment. In case of replacement,
remove the complete external fan unit.
Deinstalling
Rotating or live parts
Live electrical parts at the external fan motor are dangerous. Contact with them can cause
death, serious injury or material damage.
1. Before you start working on the fan, disconnect the fan motor from the supply system.
2. Make sure that the device cannot be switched back on.
3. Wait until the external fan has stopped before you continue.
1. Secure the external fan unit against falling before you start working.
2. Loosen the fixing screws that secure the mounting plate to the housing attachment.
3. Draw carefully the external fan unit with the fan impeller axially from the housing attachment.
4. Observe existing retaining components and retain them for the reassembly.
SIMOTICS FD 1LN1
Operating Instructions 01/2019
WARNING
Maintenance
9.2 Corrective Maintenance
137
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