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Condition Monitoring
Machine Condition Monitoring with VIB-I/O Modules
2.2.5.3 Installation Errors or Insufficient Lubrication
A high carpet value and a peak value insignificantly above, but still in the
limited range, indicate either an installation error when the bearing was
installed, or insufficient lubrication. The bearing should be re-lubricated and
measured again after some hours. If the lubrication was insufficient, the values
should decrease. If the bearing was installed wrongly, the measurement values
will remain the same.
Fig. 2.2.5-3: Installation errors or insufficient lubrication
2.2.5.4 Dry-Run or Cavitation
In this diagram, the carpet value and the peak value are very high. This can be
caused by dry-run of the bearing or cavitation at a pump. If the cause was dry-
run, a re-lubrication of the bearing results in decreased values. In the case of
cavitation, the values close to the pump enclosure will be the highest, or will
oscillate with the operating point (pressure).
Fig. 2.2.5-4: Dry-run or cavitation
dB
N
60
40
20
0
dB
N
60
40
20
0
poor
limited
good
Time
poor
limited
good
Time
WAGO-I/O-SYSTEM 750
I/O-Modules
g064516e
g064517e
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