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6.9 Blade angles
The fan rotor blade angles are the result of careful calculations to achieve a specific and
sometimes delicate point of operation. The mount on the hub and balancing are therefore
closely related to the angles and cannot be changed. Please contact Novenco for further
information.
7. Troubleshooting
Check for the below faults in case of breakdowns or lack in
performance. Call for service, if problems persist.
Lack in performance
• Blocked
• Supply air reduced
• Motors defective
• Motors disconnected
• Wrong fan rotation direction
8. Inspection and test
It is recommended to test and inspect the fans at regular intervals with regard to operability
and operation conditions.
Inspect the fans twice a year to ensure satisfactory function and long product life. Fans with
inspection hatches allow for inspection through these.
Extent of inspection
• Measure power consumption
• Verify torques of fixation bolts
• Cleaning
Novenco recommends keeping a log of all values and observations regarding the fans.
Novenco ZerAx axial fan types AZL-AZN-AZW – Installation and maintenance
- Inlets
- Outlets
- Dampers
- inside with pressurised air
- outside with a lint-free cloth with a mild
soapy water solution
Fans that operate in the
stall area are more likely
break down.
Noises and vibrations
• Motor bearings defective
• Rotors out of balance
• Rotors damaged or worn
• Bolts or components loose
• Wrong rotor blade pitch angles
• Visual inspection
- Rotors
- Fan casings
- Electrical connections
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