8.11.3 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 Remedial measures
X Rotating parts are grinding Establish the cause and realign the parts.
X Reduced air supply, direction of rotation of fan pos‐
sibly incorrect
Check the air ducts; clean the machine.
X Rotor not balanced Decouple the rotor and then rebalance it.
X Rotor out of true, shaft bent Please consult the manufacturer.
X X Poor alignment Align the machine set and check the coupling
①
.
X Coupled machine not balanced Rebalance the coupled machine.
X Shocks from coupled machine Investigate the coupled machine.
X X Fault originating from gearing Fix the gearing.
X X Resonance of the overall system comprising motor
and foundation
Reinforce the foundation after consultation with the
manufacturer.
X X Changes in foundation Determine the cause and rectify it. Realign the ma‐
chine.
①
Note any changes taking place during warm up
Operation
8.11 faults
SIMOTICS TN Series N-compact 1PQ8
106 Operating Instructions 11/2018
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