MK Plastics Inline Fan IO&M - Manual (Page 11)

Troubleshooting
Problem and Potential Cause
Low Capacity or Pressure
• Incorrect direction of rotation. Make sure the fan rotates in same direction as the arrows on the motor or drive belt
assembly.
• Poor fan inlet conditions. There should be a straight clear duct at the inlet.
• Improper wheel alignment.
Excessive Vibration and Noise
• Damaged or unbalanced wheel.
• Belts too loose; worn or oily belts.
• Speed too high.
• Incorrect direction of rotation. Make sure the fan rotates in same direction as the arrows on the motor or drive belt
assembly.
• Bearings need lubrication or replacement.
• Fan surge or incorrect inlet condition.
Overheated Motor
• Motor improperly wired.
• Incorrect direction of rotation. Make sure the fan rotates in same direction as the arrows on the motor or drive belt
assembly.
• Cooling air diverted or blocked.
• Improper inlet clearance.
• Incorrect fan RPM.
• Incorrect voltage.
Overheated Bearings
• Improper bearing lubrication.
• Excessive belt tension.
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