Siemens SIMOTICS SD User Manual

8.7.3 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
󹪝tted to one end, secure the 󹪝tted key at the other end to prevent it
from being thrown out. If the rotor has balance type "H" (standard
type), the 󹪝tted 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 compris‐
ing motor and foundation
Stabilize the foundation following consultation.
 X X Changes in foundation Establish the cause of the changes and eliminate them if necessary;
realign the machine.
(1)
Take any changes into account when warming up the machine.
8.7.4 Rolling bearing faults
Damage to rolling bearings can be di󹪟cult 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  Insu󹪟cient lubrication Grease the bearings as instructed.
X X  Bearing canted Contact the service center.
X X  Insu󹪟cient bearing play Contact the service center.
  X Excessive bearing play Contact the service center.
X X  Bearing corroded Replace the bearing. Check the seals.
Operation
8.7faults
1LE5, 1PC4 shaft heights 280 ... 355
Operating Instructions, 11/2022, A5E41454666A 95

Siemens SIMOTICS SD Specifications

General

Brand	Siemens
Model	SIMOTICS SD
Category	Engine
Language	English