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8.
Malfunction Causes and Measures
Fan malfunction causes and measures
Malfunction status
Malfunction cause
Overs and sho
rts of quantity
of wind, the sta
tic pressure
Excess/short of motor
Beari
ng ov
erhe
at/burno
ut
Abnorm
al vibr
a
tion
Pecul
iar no
ise
Corrosi
on a
nd
wear
Abnorm
al cont
act
Motor not activated
Measures
Defective installation
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Re-installation
Poor foundation
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Renovation
Contact with the rotator?
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Processing of contact part,
and re-installation
Defective duct/duct joint
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Renovation
Defective lubricating oil
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Replenishment
Inappropriate oil quality,
contamination, excessive
amount of oil
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Replacement
or
recycling
Inappropriate material
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Replacement
Unbalanced impeller
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Correction
Deformation or damage of
impeller
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Repair
or
replacement
Wear or corrosion of impeller
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Repair or replacement
Operation at a dangerous speed
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Renovation or remodeling
of operation point
Abnormal bearing of the motor
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Replacement
Wrong rotation direction
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Change
Malfunction of the motor
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Repair or replacement
Intake of light gas
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Renovation/replacement of
impeller
Intake of heavy gas
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Renovation/replacement of
impeller
Mixture of foreign object or
adhesion of scale
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Cleaning
Surging operation
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Change of operation point
Resistance to the pipe system
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Renovation
Failure of damper
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Repair
Accumulation in the drain
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Draining
There is less pressure loss than
a plan
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Damper adjustment,
change of the rotary speed
