Showa Denki KAIRYU, Instruction Manual

Page: 15 / 16

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7 Malfunction causes and countermeasures
Fan malfunction causes and countermeasures
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 ○ ○ ○ ○ ○ Re-installation
Poor foundation ○ ○ ○ Renovation
Contact with the rotator? ○ ○ ○ ○ ○ ○
Processing of contact part,
and re-installation
Defective duct/duct joint ○ ○ ○ ○ ○ ○ Renovation
Defective lubricating oil ○ Replenishment
Inappropriate oil quality,
contamination, excessive
amount of oil
○ Replacement or recycling
Inappropriate material ○ ○ ○ Replacement
Unbalanced impeller ○ ○ ○ ○ Correction
Deformation or damage of
impeller
○ Repair or replacement
Wear or corrosion of impeller ○ ○
Repair or replacement
Operation at a dangerous speed ○ ○ ○ ○
Renovation or remodeling
of operation point
Abnormal bearing of the motor ○ ○ ○ Replacement
Wrong rotation direction ○ ○ ○ ○ ○ Change
Malfunction of the motor ○ ○ ○ ○ ○ Repair or replacement
Intake of light gas ○
Renovation/replacement of
impeller
Intake of heavy gas ○ ○
Renovation/replacement of
impeller
Mixture of foreign object or
adhesion of scale
○ ○ ○ ○ ○ ○ ○ Cleaning
Surging operation ○ ○ ○ Change of operation point
Resistance to the pipe system ○ ○ Renovation
Failure of damper ○ ○ ○ ○ ○ Repair
Accumulation in the drain ○ ○ ○ ○ ○ Draining
There is less pressure loss than
a plan
○ ○
Damper adjustment,
change of the rotary speed