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5.1.2 Vibration
If vibration exceeds the allowable value, stop
the operation and perform the inspection.
Possible causes of vibration are as follows:
•
Unbalance of the impeller due to adhesion of dust to it
•
Deformation/damage of Impeller/casing
•
Abnormal axis or bearing
•
Rattling due to looseness of bolts
•
Stall operation or variation of flow
•
Transmission/resonance of vibration
•
generated from the duct/mount
•
Lack of rigidity of duct or mount
5.2 Replenishment of lubricating oil (grease) (V-belt drive only)
Regularly replenish the bearing with lubricating oil (grease) is also necessary to use the blower
safely for a long period of time. Even if high quality grease is used, its lubricating function reduces
due to deterioration or hardening of the grease itself as the period of use lapses. Therefore,
replenish the blower with the appropriate amount of new grease at the appropriate time.
•
When replenishing, select the grease from the following table.
Table of brands of specified grease
Temperature specification
of blower
Grease manufacturer
Product name of grease
(brand)
Normal temperature
specification
Showa Shell Sekiyu K.K.
Albania S3
Heat-proof specification
Dow Corning Toray Co., Ltd.
SH44M
(Remarks) A label indicating the “type of grease and interval for replenishment” is
affixed to the product.
The brands above are standard grease for the standard type of bearing
“pillow block bearing” used in this product.
For special specification products, refer to the separate reference materials.
•
If a foreign material mixes with grease, it causes damage to the bearing. Store grease in a
closed container. Prevent grease of a type from mixing with that of a different type.
•
Prevent decreasing the number of replenishments by increasing the amount of grease for a
replenishment.
•
Be sure to confirm safety, and then replenish the bearing with grease during operation.
•
For interval for replenishment and the replenishment amount, use the table below as a rough
indication.
Acceptable
Unacceptable
Vibration allowance value
Vibration allowance value
with antivibration
equipment
Tot
al
am
plit
ude
(
μ
m)
Rotation speed (min
－
1
)
Vibration allowance value graphic
