6-1
6. Maintenance and inspection
6.1 Daily inspection
(1) Check vibration, noise, bearing temperature, the amount and cleanliness of the oil, cooling
water, amperage, etc.
If there is any unusual condition, it may be a sign of failure; therefore, take the appropriate
measures as soon as possible.
For this purpose, it is recommended to keep an operation log.
Warning
The main shaft, V-belt pulley, and V-belt are rotating during
operation. Care should be taken so that your clothing is not caught in
these parts.
(2) The bearing temperature must be less than [the normal room temperature plus 40°C] or
[70°C], whichever is lower.
(3) If strong vibrations occur, stop the operation
and inspect the V-belt alignment, duct
connections, tightening of the mounting bolts
and foundation bolts, and check for
accumulation of dust on the impeller and
damage to the bearings.
If the vibration is within the range specified as
"Good" in JIS B 8330, it is considered normal
(see the figure on the right).
If a vibration insulating device is installed on
the fan, the vibration of the fan itself becomes
slightly stronger while it is not transmitted to
the foundation. In such a case, a vibration
lower than the broken line is considered
normal.
(4) In addition to vibrations, noise is an important
factor in judging the operating condition.
If you hear a metallic sound possibly made by
contact into the rotor, stop the operation
immediately.
Continuous roaring or hissing noise of air
flowing inside the casing is normal; however,
discontinuous hissing or howling noise is
caused by surging. An appropriate measure is
required in the latter case, for example by
changing the damper opening.
(5) Bearings generate some noise even in normal condition.
It is difficult to identify an abnormal noise because bearings produce complicated noise, so
learn about the noises thoroughly to prevent any accident.
n - Rotation (mim
-
)
Acceptable vibration range
a - Total amplitude (μm)
With vibration isolator
10mm/s
Acceptable
Excellent
Good
(On the bearing box)
Unacceptable
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