Mechanical Faults - Siemens 1LA8 Operating Instructions Manual

Operation
8.9 faults
8.9.3

Mechanical faults

The following table shows the possible causes of and remedial measures for mechanical
faults.
Table 8-2 Mechanical faults
↓ Grinding noise
↓ Overheating
↓ Radial vibrations
↓ Axial vibrations
Possible causes of faults
X Rotating parts are grinding
X Reduced air supply, direction of rotation of fan pos‐
sibly incorrect
X Rotor 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 Fault originating from gearing
X X Resonance of the overall system comprising motor
and foundation
X X Changes in foundation
Note any changes taking place during warm up
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Remedial measures
Establish the cause and realign the parts.
Check the air ducts; clean the machine.
Decouple the rotor and then rebalance it.
Please consult the manufacturer.
Align the machine set and check the coupling
Rebalance the coupled machine.
Investigate the coupled machine.
Fix the gearing.
Reinforce the foundation after consultation with the
manufacturer.
Determine the cause and rectify it. Realign the ma‐
chine.
SIMOTICS TN Series N-compact 1LA8
Operating Instructions 05/2016
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