3. Then push the external fan ① onto the shaft up to its stop. Use a suitable device for this
purpose.
4. Insert the retaining ring ② into the corresponding groove and check its fit.
Air inlet nozzle
Two-pole machines are equipped with an air inlet nozzle ③. The spacing between external
fan and air inlet nozzle must measure ≥ 2 mm evenly over the circumference.
WARNING
Danger of explosion as a result of a fan impeller coming into contact with its surroundings
The fan impeller of a metallic external fan coming into contact with another component can
cause arcing and explosion. This can result in death, serious injury or material damage.
● Remove any dirt.
● Regularly and after any performed work check the distance between the fan impeller and
adjacent components, such as air inlet nozzle. Correct the alignment of the components,
if necessary. The gap between the air inlet nozzle and the fan impeller should be at least
2 mm around the complete circumference.
● Please contact the Service Center if you require any support when aligning the
components.
See also
Service and Support (Page 155)
9.2.6 Internal fan
The internal fan is located on the rotor inside the machine. If the internal fan is defective or
must be replaced, please contact the Service Center (Page 155).
9.2.7 External fan
If the external fan is defective, contact the Service Center (Page 155).
9.2.8 Ensuring cooling by means of external fans
● Ensure that an unbroken uniform gap of at least 2 mm is maintained between the fan
impeller and the inlet nozzle.
● Pay attention to the central alignment of the nozzle to the fan impeller.
Maintenance
9.2 Corrective Maintenance
SIMOTICS TN Series N-compact 1PQ8
126 Operating Instructions 11/2018
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