Rolling Bearing Faults - Siemens SIMOTICS DP Operating Instructions Manual

↓ Grinding noise
↓ Radial vibrations
↓ Axial vibrations
Possible causes of faults
X Rotor out of round, shaft bent
X X Poor alignment
X Coupled machine not balanced
X Shocks from coupled machine
X X Uneven running of gear unit
X X Resonance of the overall system compris‐
ing motor and foundation
X X Changes in foundation
Take any changes into account when warming up the machine.
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8.6.4

Rolling bearing faults

Damage to rolling bearings can be difficult to detect in some cases. If in doubt, replace the rolling
bearing. Use other bearing designs only after consulting the manufacturer.
Table 8-3 Rolling bearing faults
↓ Bearing overheats
↓ Bearing "whistles"
↓ Bearing "knocks"
Possible causes of faults
X High coupling pressure
X Belt tension too high
X Bearing contaminated
X High ambient temperature
X X Insufficient lubrication
X X Bearing canted
X X Insufficient bearing play
X Excessive bearing play
X X Bearing corroded
X Too much grease in bearing
X Wrong grease in the bearing
X Friction marks on raceway
X Brinelling or scoring
1FZ shaft height 280
Operating Instructions, 02/2022, A5E51698698A
Remedial measures
Consult the manufacturing plant.
Align the machine set; check the coupling.
Rebalance the coupled machine.
Investigate the coupled machine.
Fix the gearing.
Stabilize the foundation following consultation.
Establish the cause of the changes and eliminate them if necessary;
realign the machine.
Remedial measures
Align the machine more accurately.
Reduce the drive belt tension.
Clean or replace the bearing. Check the seals.
Use a suitable high-temperature grease.
Grease the bearings as instructed.
Contact the service center.
Contact the service center.
Contact the service center.
Replace the bearing. Check the seals.
Remove surplus grease.
Use the correct grease.
Replace the bearing.
Replace the bearing. Avoid any vibration at standstill
Operation
8.6 faults
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