Troubleshooting and fault elimination8
66
Lenze ¯ MA 12.0014 ¯ 5.1
8 Troubleshooting and fault elimination
If any malfunctions should occur during operation of the drive system, please check the
possible causes using the following table. If the fault cannot be eliminated by one of the
listed measures, please contact the Lenze Service.
Fault Possible cause Remedy
Drive is not running
Voltage supply interrupted Check connection
Faulty electrical connection Check that supply voltage
matches nameplate data
Excessive load Reduce load
Check drive−machine
assignment
Motor is running, but
gearbox is not running
Coupling components are missing or
defective
Check mounting
Gearbox is defective Inform Lenze Service
Clutch disengaged Engage the clutch
Unusual running noises
Overload Reduce load
Check drive−machine
assignment
Damage to the gearbox or motor Inform Lenze Service
Excessive temperature
Overload Reduce load
Check drive−machine
assignment
Inadequate heat dissipation Improve cooling air flow
Clean gearbox / motor
Lack of lubricant Top up lubricant according to
regulations
Vibrations, noise Loose fixing elements Tighten fixing elements
Shrink disc connection is
spinning
¯ Correct screw tightening torque has not
been reached
– Insufficient number of passes, not all
screws are tightened correctly.
¯ Machine shaft and hollow shaft bore
not sufficiently degreased
¯ Wrong component part dimensions
– Fits, roughnesses
¯ Yield point of machine shaft material is
too low
– Re > 300 N/mm
2
required
¯ Friction factors are too low
– Coefficients of friction m ³ 0.15
required
¯ The shrink disc itself has been
degreased so that the screws and the
bevels are dry. Due to incorrect friction
factors, the shrink disc cannot be
tightened correctly.
Specifications for assembly,
dimensions and material not
observed
Oil is leaking
Wrong oil level for the applied mounting
position
Check mounting position
(see nameplate) and oil level
Initial insignificant leakage at the shaft
sealing ring
Optimum sealing conditions
only develop after the run−in
period
Overpressure due to lacking ventilation Install ventilation according
to the mounting position
Overpressure due to polluted ventilation Clean ventilation
Worn−out shaft sealing rings Change shaft sealing rings
Cover / flange screws are loose Check that the fixing screws
are tightly fastened.
Continue to monitor the
gearbox
Oil discharge at the gearbox
ventilation unit
Incorrect oil level for the mounting position
applied and/or incorrect position of
ventilation unit
Mounting position (see
nameplate)
Check oil level^ 59
Check position of ventilation
unit ^ 50
Use oil compensation
reservoir
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