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7. Troubleshooting
7.1 Troubleshooting
Even if the same failure occurs, the cause and action may be different. In addition, there may be
two or more causes.
If the cause and action cannot be determined using the following table, stop the operation
immediately and contact a specialist company or the service center specified by the
manufacturer.
Caution
Part replacement and repairs should only be performed by specialist
companies.
Improper procedures may lead to malfunctions or accidents.
Failure Cause Action
Strong
vibration
Corrosion or wear in the impeller, or
foreign matter on the impeller
Poor connection between the boss and
shaft of the impeller
Bend of the shaft
Contact between the rotor and casing
Resonant vibration by improper
foundation
Insufficient tightening of the mounting
bolt
Damage to the bearing
Remove the foreign matter adhered to the
impeller, and correct the balance of the
impeller.
Replace the impeller or shaft of the motor.
Replace the motor.
Reassemble the casing.
Reinforce the foundation.
Retighten the bolt and nut.
Replace the bearing.
Abnormal
noise
Damage to the bearing
Intake of foreign matter
Contact between the rotor and casing
Replace the bearing.
Inspect the inside of the casing.
Correct the contact between the rotor and
casing.
Low
performance
Decrease in rotational speed or
frequency
Reverse rotation
Corrosion or wear in the impeller, or
foreign matter on the impeller
Clogging of the suction filter
Failure in opening/closing of the damper
Dust deposited inside the casing and
duct
Excessive resistance
Errors in calculating the specific weight
of gas
Regulate the power supply.
Swap the wires of the motor.
Clean, repair, or replace the impeller.
Clean the suction filter.
Repair the damper.
Clean the place.
Consider installing a booster fan.
Measure the specific weight, or perform a
gas analysis.
Motor
overload
Underestimation of actual resistance
Miscalculation of gas density
Adjust with damper
Reduce the rotational speed.
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