Lescheider Weg 6-8 • D-53773 Hennef-Bierth • Tel. +49 2248 9173-0 • Fax -79 • www.kunststoff-mueller.de
23/36
Fault
Possible causes
Remedial measures
Fan runs rough
(oscillations and
vibrations)
Changes in the foundation/s
and hence major oscillation of
the fan
Determine the cause/s of the change/s and
remedy them if possible.
Check foundation/s and fan and dampen
vibrations.
Rotor out of balance
Balance it.
Advise Joh. Mueller Kunststoff GmbH.
Deposits on the rotor
Remove gently.
Rotor damage
Damage to the rotor must be remedied.
Advise Joh. Mueller Kunststoff GmbH.
Rotor turns the wrong way
Correct it.
Axial/ radial oscillations of the
motor
Check and adjust as needed.
Advise Joh. Mueller Kunststoff GmbH.
Motor overheating
Motor turning the wrong way
Check and correct.
Motor air supply reduced
Check. Clean motor.
Damage to motor windings
Check motor and replace if necessary.
Advise Joh. Mueller Kunststoff GmbH.
Bearing overheated Lubricating intervals not
adhered to
Lubricate or replace bearings
Fan or motor
doesn’t start or
runs up roughly
Motor overload
Reduce load.
Interruption of a phase in a
motor electricity supply cable
Check switches and wiring.
Mains voltage too low,
frequency too high
Check mains.
Motor stator winding incorrectly
wired
Check motor stator winding.
Low fan
performance
Rotor turns the wrong way
Correct rotor turn direction.
Inlet and/or outlet not leakproof
Check both and remedy leaks.
Motor stator winding incorrectly
wired
Check motor stator winding.
