Mechanical Faults; Roller Bearing Faults; Table 8-2 Mechanical Faults; Table 8-3 Roller Bearing Faults - Siemens SIMOTICS HV C Operating And Installation Instructions

Operation
8.9 Faults
8.9.3

Mechanical faults

Table 8-2 Mechanical faults
↓ Grinding noise
↓ Radial vibrations
↓ Axial vibrations
Possible causes of faults
X Rotating parts grind
X Stator or coupling not balanced.
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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8.9.4

Roller bearing faults

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
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Remedial measures
Establish the cause and realign the parts.
Disconnect the stator 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.
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.
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SIMOTICS HV C 1NB1402-2AA84-4CA0-Z
Operating Instructions 06/2018