Siemens SIMOTICS GP series - Mechanical Faults; Rolling Bearing Faults

Operation
8.6 faults
Standard motors SH 63 ... 355
94 Operating Instructions, 12/2018, A5E38483075A
8.6.3 Mechanical faults
Table 8- 2 Mechanical faults
↓ Grinding noise
↓ Radial vibrations
↓ Axial vibrations
Possible causes of faults
Remedial measures
X Rotating parts grind Establish the cause and realign the parts.
X Rotor or coupling not balanced.
Disconnect the rotor or coupling and rebalance.
If the machine has two shaft ends, and a transmission element is
only fitted to one end, secure the fitted key at the other end to
prevent it from being thrown out. If the rotor has balance type "H"
(standard type), the fitted key must be cut back to roughly half of
its length.
X
Rotor out of round, shaft bent
Consult the manufacturing plant.
X
X
Poor alignment
Align the machine set; check the coupling.
(1)
X
Coupled machine not balanced
Rebalance the coupled machine.
X
Shocks from coupled machine
Investigate the coupled machine.
X
X
Uneven running of gear unit
Fix the gearing.
X X Resonance of the overall system com-
prising motor and foundation
Stabilize the foundation following consultation.
X X Changes in foundation Establish the cause of the changes and eliminate them if neces-
sary; realign the machine.
(1)
Take any changes into account when warming up the machine.
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
Remedial measures
X
High coupling pressure
Align the machine more accurately.
X Belt tension too high Reduce the drive belt tension.
X
Bearing contaminated
Clean or replace the bearing. Check the seals.
X
High ambient temperature
Use a suitable high-temperature grease.
X
X
Insufficient lubrication
Grease the bearings as instructed.
X
X
Bearing canted
Contact the service center.
X
X
Insufficient bearing play
Contact the service center.
X
Excessive bearing play
Contact the service center.