COOK QMX - Manual (Page 8)

8
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 belt
drive assembly.
•Poor fan inlet or outlet conditions. There should be a straight clear duct at the inlet or outlet.
•Improper wheel alignment.
Excessive Vibration and Noise
•Damaged wheel.
•Belts misaligned.
•Belts too loose; worn or oily belts.
•Loose fasteners.
•Speed too high.
•Incorrect direction of rotation. Make sure the fan rotates in same direction as the arrows on the motor or belt
drive assembly.
•Bearing set screws loose.
•Bearings need lubrication or replacement.
•Debris in impeller.
•Fan surge.
•See page 4 for issues regarding use of VFD.
Overheated Motor
•Motor improperly wired.
•Incorrect direction of rotation. Make sure the fan rotates in same direction as the arrows on the motor or belt
drive assembly.
•Cooling air diverted or blocked.
•Improper inlet clearance.
•Incorrect fan speed.
•Incorrect voltage.
Overheated Bearings
•Improper bearing lubrication
•Excessive belt tension.