Roller Bearing Faults - Siemens SIMOTICS XP 1MD4 Operating Instructions And Installation Instructions

Operation
8.7 Faults
↓ Grinding noise
↓ Radial vibrations
↓ Axial vibrations
Possible causes of faults
X Rotor out of true, 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 com‐
prising motor and foundation
X X Changes in foundation
Take any changes into account when warming up the machine.
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8.7.4

Roller bearing faults

Note
Damage to roller bearings can be difficult to detect in some cases. If in doubt, replace the
bearing. Use other bearing designs only after consulting the manufacturer.
Table 8-3 Roller 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
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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 the bearing or replace it. Check the seals.
Use a suitable high-temperature grease.
Grease the bearings as instructed.
Properly install the bearing.
Only after consultation with the manufacturer: Fit a bearing with
greater play.
Only after consultation with the manufacturer: Fit a bearing with
lower play.
Replace the bearing. Check the seals.
Remove surplus grease.
Use the correct grease.
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SIMOTICS XP 1MD4/1MD5
Operating Instructions 05/2015