Diagnostics and fault elimination
Malfunctions
If faults occur during the operation of the drive, the table below helps you to identify the
causes. If it is not possible to remedy the fault using the measures listed, please contact the
Lenze service department.
Error
Possible cause
Remedy
Drive is not running
Voltage supply interrupted
Check connection
Faulty electrical connection
Check external voltage supply.
Load too high
Reduce load
Check assignment drive - machine
Motor runs, gearbox does not
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 assignment drive - machine
Excessive temperature
Overload
Reduce load
Inadequate heat dissipation
Improve cooling air supply, 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.
Specifications for assembly, dimensions and material
must be observed
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/mm2 required
Friction factors are too low
-
Surface roughness Rz ≤ 15 µm 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.
Oil is leaking
Wrong oil level for the applied mounting position
Check mounting position (see nameplate) and oil level
Initially slight leakage at the shaft seal
Optimum sealing conditions only arise after the
running-in phase
Overpressure due to lacking ventilation
Install ventilation according to the mounting position
Overpressure due to polluted ventilation
Clean ventilation
Worn-out shaft sealing rings
Check condition of sealing lip contact area, repair if
necessary.
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
Check mounting position (see nameplate) and oil level
Check position of ventilation unit
Use oil compensation reservoir
Diagnostics and fault elimination
Malfunctions
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