Elektror CF Series - Disturbances of Bearing System; Clutch Disturbances; Table 17: Disturbances of Bearing System; Table 18: Clutch Disturbances

Operating manual - Fan CF-C Operation of the fan
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The fan does not start Electrical motor incorrectly
connected
Check the connection
In the case of a star-delta
connection, the engine remains
in the star position
Reduce switching time from star to delta
The fan starts due to low
resistance
Close the throttling device or install
additional covers
The engine protection system is
calculated too low
The cable cross-section and protective
systems require adjustment to the inrush
current
Too long to start-up Close the throttling device and check the
tightening torque of the MA/MN electric
motor
The electric motor is damaged Switch off and replace the electric motor if
necessary
The electric motor is too hot
due to too high switching
values.
The fan should be used in continuous
mode and regulated with a throttling device
or a frequency converter
Too high inrush current Incorrect voltage
Star-delta start-up should be provided, too
weak local mains
8.7.3.1 Disturbances of bearing system
Table 17: Disturbances of bearing system
Disturbance Possible cause Countermeasure
Doesn't run smoothly Damage to the rings and rolling
elements of bearings
Replace the bearings
Bearing play too large
Wear caused by impurities or
inadequate lubrication
Protect bearings from dust.
Use clean lubricants.
Unusual noises
Howl or whistles Running clearance too low Install the bearing with greater running
clearance
Tapping or uneven sound Too much running clearance,
damage to rolling surfaces,
impurities
Replace the bearings
Incorrect lubricant Choose the right lubricant
Gradual change of work
sounds
Changing the running clearance
e.g. due to the influence of
temperature.
damage to the rolling surface,
e.g. due to impurities or
material fatigue
Protect bearings against the influence of
temperature
8.7.3.2 Clutch disturbances
Table 18: Clutch disturbances
Disturbance
Possible cause
Countermeasure
Doesn't run smoothly Inaccuracy in coupling of the
clutch halves
Check the clutch alignment in accordance
with the installation / operation instructions
of the clutch manufacturer
Flexible clutch components
have worn out
Replace flexible clutch components
Flexible clutch components are
Replace flexible clutch components with