Table of Contents
Advertisement
Appendix - G. Checklists
Before installation
Turn rotor by hand - it must turn freely
Outdoor installations: Location must be sheltered
Ground fan to remove static electricity
Clear installation location to ensure free airflows
Install wire guards on front and back of fan (IP20)
Before start-up
Turn rotor by hand - it must turn freely
Remove transport rods from support frame
Clear fans and airflow ways
Inspect wire guards
Turn fan on briefly to verify rotational direction
Start-up
Power on fans
Check for abnormal sounds and vibrations
Measure vibrations – see "Vibration levels" on page 15
After 30 min. operation – check for abnormal sounds
Before inspection and maintenance
Turn off power for fans
Disconnect power supply
Lock power switches
Novenco ZerAx axial fan types AZL-AZN-AZW – Installation and maintenance
Inspection and maintenance
Inspection
• Measure power consumption at ½ and full
speeds
• Verify torques of fixation bolts
• Measure vibrations on fan casing
• Visual inspection – rotor, casing, silencers and
electric connection
Maintenance
• See "Before inspection and maintenance"
• Clean the fans
• Service fans - drain motor, check electrics
• Replace broken parts
• Lubricate motor bearings
• Turn fan on briefly to verify rotational
direction
Troubleshooting
Lacking performance
• Inlet or outlet blocked
• Auxiliary fans stopped
• Motor defective
• Motor disconnected
• Electric connection defective
• Wrong rotational direction of rotor
Noise and vibrations
• Motor bearings defective
• Rotor imbalance
• Rotor worn or damaged
• Loose components
• Wrong rotor blade pitch angles
• Fan operates in stalling area
29 of 30
Advertisement
Table of Contents
