Mechanical Faults; Rolling Bearing Faults - Siemens SIMOTICS XP 1MB 1 Series Operating Instructions Manual

8.6.3

Mechanical faults

Table 8-2 Mechanical faults
↓ Grinding noise
↓ Radial vibrations
↓ Axial vibrations
Possible causes of faults
X Rotating parts grind
X Rotor or coupling not balanced.
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
1MB..1/2/3/4 - shaft heights 63 ... 355
Operating Instructions, 11/2023, A5E52779900A
Remedial measures
Establish the cause and realign the parts.
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.
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.
Operation
8.6 faults
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