36
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 elds of
J electrics / electronics
J mechanics / maintenance.
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-
ed measures are successful, please, contact the manufacturer.
9. Troubles, causes and measures
Operating manual
Centrifugal fans
HF R | RV | MRV
www.hlu.eu
Trouble Possible cause Remedial action
Temperature
rise at the
bearings
Increased exing work at bearing by
fresh lubrication or new bearing
Fan continue to operate, Temperature
normalizes after a certain period by
itself
Lubrication intervals were not observed
Change bearing and correct the lubri-
cation according to the intervals
V-belt tension too high Correct V-belt tension
Leakage
at the shaft
passage
Sealing element worn out Change sealing element
Unquiet run
of fan (heavy
vibration)
Foundation is subject to heavy vibra-
tion
Damp the foundation / fan
Impeller unbalance
Balancing required, consult manufac-
turer
Deposits on the impeller Clean the impeller
Damage on impeller Consult manufacturer
Motor
bearing noise
Motor bearing damaged
Replace bearing or motor,
Consult manufacturer or motor supplier
Fan power
output too
low
Wrong impeller rotating direction Reverse the rotating direction
Output reduction facilities are not ope-
ned, or opened only partly
Check the output power reduction
facilities
Pipe resistances on inlet or outlet side
too high
Reduce resistances, increase the fan
power, consult manufacturer
Motor power
consumption
to high
Defective motor winding
Change motor, consult manufacturer or
motor supplier
Wrong impeller rotating direction Reverse the rotating direction
Motor protective switch is not adjusted
correctly
Adjust motor protective switch correctly
Motor is
switched o
by the motor
protection
switch
Motor protective switch is not adjusted
correctly
Adjust motor protective switch correctly
Motor winding defective
Change motor,
consult manufacturer or motor supplier
Impeller blocked Check impeller
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