Assembly
Proceed in the reverse order to assemble the fan cowl.
1. Position the fan cowl and tighten the fixing screws.
2. Ensure that the retaining components are undamaged and correctly installed.
9.2.4 External fan made of metal
External metal fans have a keyway connection and are prevented from axially shifting using
a locking ring.
Disassembly
1. The external fan ① is fixed on the shaft with a locking ring ②. Remove the locking ring.
Pliers according to DIN 5254 should preferably be used for this purpose.
2. Use a suitable device to pull off the external fan.
3. Avoid using a hammer.
4. Secure the parallel key from falling out or remove it.
Image 9-1 Ventilation (schematic diagram with axial fan)
Assembly
1. Remove the parallel key lock or insert it in the keyway.
2. Check the correct seating.
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.
Maintenance
9.2 Corrective Maintenance
SIMOTICS TN Series N-compact 1LA8
108 Operating Instructions 05/2016
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