MK Plastics DHK-NW IO&M - Manual (Page 8)

M.K. Plastics Corp. Montréal, Québec www.mkplastics.com Page. 8
Excessive Noise or Vibration
• Damaged wheel.
• Wheel rubbing inlet; adjust wheel or inlet cone.
• Verify wheel balance, rebalance if necessary.
• 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 collars or hardware loose.
• Bearings need lubrication or replacement.
• Debris in impeller; clean all dirt off wheel, check wheel balance and rebalance if necessary.
• Fan surge.
•
Check alignment of shaft and motor drives.
Low Volume 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.
• Check duct system, see Page 2. For recommendations.
Motor Problems (Overheating)
• 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.
•
High horsepower; resize the ductwork. Check proper operation of face and bypass dampers. Check filters
and access doors.
• Cooling air diverted or blocked.
• Improper inlet clearance.
• Incorrect fan speed.
•
Incorrect voltage.
Bearing Problems (Overheating)
• Improper bearing lubrication; check for excessive or insufficient grease in bearings.
•
Excessive belt tension.
• Check for bent shaft.
• Align bearings.
Troubleshooting