Rolling-Contact Bearing Faults - Siemens SIMOTICS T-1FW4407-1KM81-1BC0-Z Operating Instructions Manual

Operation
8.8 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 Resonance with the foundation
X X Changes in foundation
Take into account possible changes which may occur during overheating.
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8.8.4

Rolling-contact bearing faults

Damage to roller bearings can be difficult to detect in some cases. If in doubt, replace the roller
bearing. Contact the Service Center.
Table 8-3 Roller bearing faults
↓ Bearing overheats
↓ Bearing "whistles"
↓ Bearing "knocks"
Possible causes of fault
X High coupling pressure
X Ambient temperature higher than 40 °C
X X Insufficient lubrication
X Too much grease in bearing
X Wrong grease in the bearing
X Belt tension too high *
X Bearing contaminated
X X Bearing canted
X X Insufficient bearing play
X X Bearing corroded
X Friction marks on raceway
X Brinelling or scoring
X Excessive bearing play
X Mechanical wear of bearing elements
* Only in special version
See also
Service and Support (Page 103)
80
Remedial measures
Contact the Service Center.
Align the machine set and check the coupling.
Rebalance the coupled machine.
Examine the coupled machine.
Stabilize the foundation after prior discussion.
Determine the cause of the changes and, if necessa‐
ry, rectify. Realign the machine.
Remedial measures
Align the machine more accurately.
Use high-temperature grease.
Grease the bearings as instructed.
Remove surplus grease. Contact the Service Center, if necessary.
Use the correct grease.
Reduce the drive belt tension.
Contact the Service Center.
SIMOTICS T-1FW4 Heavy Duty 1FW4407-1KM81-1BC0-Z
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Operating Instructions 11/2018