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Plug fan
The fan is directly flanged to the motor due to the absence of the belt drive it is a service
-
friendly component.
To reach the operating point, a frequency converter is required.
-
-
Deposits on the wheel can cause damage (risk of fatigue fracture) - impeller can burst -
Danger!
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Visually inspect: Check the wheel for any particular weld cracking.
9.2.2 Motor
Check the motor for cleanliness and clean if necessary.
-
Measure current consumption which must not exceed the rated current indicated on the
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nameplate.
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Check motor bearings by rotating the shaft by hand and check with a metal rod for noise.
In case of irregular or rough sound, the corresponding bearing must be replaced.
Motor bearings
Small and medium sized motors are equipped with closed bearing running for several
-
years without need of lubrication.
Bearings of larger motors, depending on the motor manufacturer and motor size, are
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equipped with nipples for lubrication. For exact details and information regarding grease
type and quantity for lubrication please refer to operating instructions of motor manufac-
turer. After three re-lubrications the bearings must be dismounted, cleaned and greased
again. For lubrication intervals under normal operating conditions and 24 h/day load refer
to Table 10.
Size
bis 180
bis 250
280
For different, unfavorable operating conditions, the intervals are to be reduced according
-
to motor manufacturer's instructions.
Recommended grease types for relubrication of motor bearings can be taken from Table
-
9 chapter 9.2.1 (Fan).
9.2.3 V-belt drive
The V-belt drive is a reliable, low-maintenance component provided that unfavorable working
conditions as shown in Figure 130 up to Figure 133 which may reduce durability and result
in reduced efficiency. The unfavorable conditions include high temperatures and inadequate
filtered air and thus formation of deposits.
Check V-belt drive for dirt, damage, wear, tension and alignment (visible inspection).
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Belts with damages like cracks or frayed edges must be replaced.
Pulleys must be checked for fitting, wear and damage.
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2-pole
3000 1/min
1500 1/min
12
6
3
Table 10: Lubrication intervals for motor bearings (in month)
4-pole
6-pole
1000 1/min
12
12
12
12
12
12
8-pole
750 1/min
12
12
12
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