Troubles, Causes And Measures - HLU HF R 48 R Series Operating Manual

36

9. Troubles, causes and measures

Trouble
Temperature
rise at the
bearings
Leakage
at the shaft
passage
Unquiet run
of fan (heavy
vibration)
Motor
bearing noise
Fan power
output too
low
Motor power
consumption
to high
Motor is
switched off
by the motor
protection
switch
06.2019
The facts and information relating to „Troubles, cause and measures"
described in this operating manual are formulated in a way that they
are understood by persons with a professional training in the fields of
J electrics / electronics
mechanics / maintenance.
J
Appropriate tools and test equipment must be made available to this
personnel. Before any maintenance and repair work, the fan must be
de-energized and protected against re-activation. Unless the speci-
fied measures are successful, please, contact the manufacturer.
Possible cause
Increased flexing work at bearing by
fresh lubrication or new bearing
Lubrication intervals were not observed
V-belt tension too high
Sealing element worn out
Foundation is subject to heavy vibra-
tion
Impeller unbalance
Deposits on the impeller
Damage on impeller
Motor bearing damaged
Wrong impeller rotating direction
Output reduction facilities are not ope-
ned, or opened only partly
Pipe resistances on inlet or outlet side
too high
Defective motor winding
Wrong impeller rotating direction
Motor protective switch is not adjusted
correctly
Motor protective switch is not adjusted
correctly
Motor winding defective
Impeller blocked
Operating manual
Centrifugal fans
HF R | RV | MRV
Fan continue to operate, Temperature
normalizes after a certain period by
itself
Change bearing and correct the lubri-
cation according to the intervals
Correct V-belt tension
Change sealing element
Damp the foundation / fan
Balancing required, consult manufac-
turer
Clean the impeller
Consult manufacturer
Replace bearing or motor,
Consult manufacturer or motor supplier
Reverse the rotating direction
Check the output power reduction
facilities
Reduce resistances, increase the fan
power, consult manufacturer
Change motor, consult manufacturer or
motor supplier
Reverse the rotating direction
Adjust motor protective switch correctly
Adjust motor protective switch correctly
Change motor,
consult manufacturer or motor supplier
Check impeller
Remedial action
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