6-1
6. Maintenance
and
inspection
6.1 Daily
inspection
(1) Check the fan for any vibration, noise, abnormal current value, or any other abnormal conditions.
A deviation from the normal status is a sign of a failure. Therefore, immediately perform detailed
inspection and maintenance.
For this purpose, it is recommended to keep an operation log.
(2) If strong vibrations occur, stop the operation and check for any improper duct piping, any loose
hanging bolts, any accumulation of dust onto the impeller, or any damage to the bearings.
(3) In addition to vibrations, noise is an important factor in judging the operating condition.
If you hear a metallic sound possibly made by something being in contact with the rotor,
immediately stop the operation.
6.2 Periodic
inspection
Warning
Before carrying out the inspection of the fan, be sure to turn off the main
power. The fan may suddenly start up through automatic operation or
from other causes, thus exposing the personnel to great danger.
Perform the periodic inspection at least once a year.
Take care of the following items, in addition to the daily inspection items.
(1) Check each section for any loose bolts or nuts.
(2) Check the impeller, motor, and others parts for any corrosion.
(3) Clean the inside of the fan.
(4) Check that the insulation resistance of the motor has not decreased. The resistance must be at
least 1M
Ω
.
(5) The motor has an estimated service life of about 20,000 hours. Since the life depends on the
operation conditions, the motor should be replaced If any abnormal vibration or noise is
generated.
