COOK QMXD Manual de instalación, uso y mantenimiento - Página 8
Navegue en línea o descargue pdf Manual de instalación, uso y mantenimiento para Ventilador COOK QMXD. COOK QMXD 13 páginas. Mixed flow inline
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11. Rotate shaft to allow bearings to align themselves.
12. Replace wheel but do not tighten yet.
13. Replace inlet cone. Wheel may need to be moved to allow
proper alignment. Care should be taken to insure that inlet
cone is centered inside wheel before and after tightening
attaching bolts.
14. Slide wheel on shaft to achieve proper wheel/inlet overlap
and tighten wheel set screws. Refer to Wheel-to-Inlet
Clearance, page 3.
15. Tighten hold-down bolts to proper torque.
16. Turn the shaft by hand. Resistance should be the same as
it was before hold-down bolts were fully tightened.
17. Tighten all bearing setscrews to full specified torque.
18. Replace the sheave, align with motor sheave and adjust
the belt tension.
19. Test run fan and retighten all setscrews and bolts and trim
balance as necessary. (0.0785 in/sec max).
20. Replace discharge cover.
Wheel Replacement (Belt Drive)
The wheel has a pre-machined shoulder in the hub for the
use of most two and three jaw mechanical pullers.
1. Align center of the puller with the center of the shaft.
2. Ensure all setscrews in the hub, normally two, are fully
removed.
3. Slowly remove wheel from the shaft.
SEE DETAIL A
PRE-MACHINED SHOULDER
QMX IO&M
DETAIL A
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 conditions. There should be a straight clear
duct at the inlet or outlet
• Improper wheel alignment
• Fan backwards. Refer to airflow diagram on page 5
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 setscrews 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
8
B51092-005