Fans - Troubleshooting
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Excessive Vibration and Noise
- Belts too loose - worn or oily belts
- Speed too high
- Damaged or unbalanced wheel
- Bearings need lubrication or replacement
- Fan surge
- Incorrect direction of rotation. Make sure the fan rotates in same direction as the arrows on the motor or belt drive assembly
Low Capacity or Pressure
- Poor fan inlet conditions - there should be a straight clear duct at the inlet
- Incorrect direction of rotation - make sure the fan rotates in same direction as the arrows on the motor or belt drive assembly
- Improper wheel alignment
Overheated Motor
- Motor improperly wired
- Cooling air diverted or blocked
- Improper inlet clearance
- Incorrect fan RPM
- Incorrect direction of rotation - make sure the fan rotates in same direction as the arrows on the motor or belt drive assembly
- Incorrect voltage
Overheated Bearings
- Improper bearing lubrication
- Excessive belt tension
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Related Topics
• Ventilation Systems
Design of systems for ventilation and air handling - air change rates, ducts and pressure drops, charts and diagrams and more.
Related Documents
Belt driven Fans - Fan vs. Motor Speed
Fan vs. motor speed in belt driven fans.
Fan Affinity Laws
The affinity laws can be used to calculate resulting volume capacity, head or power consumption when speed or wheel diameters are changed.
Fan Motors - Starting Torques
The motor must be capable of accelerating the fan wheel to it's operating speed.
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