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!
-
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
nameplate.
-
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
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
Size
2-pole
3000 1/min
4-pole
1500 1/min
6-pole
1000 1/min
8-pole
750 1/min
bis 180
12
12
12
12
bis 250
6
12
12
12
280
3
12
12
12
Table 10:
Lubrication intervals for motor bearings (in month)
-
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
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
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)
.
Belts with damages like cracks or frayed edges must be replaced.
-
Pulleys must be checked for fitting, wear and damage.
Summary of Contents for CCEB
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