EasyBalancer EB 3500 Evaluation - Assessment of roller bearing condition
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10.3 Assessment of roller bearing condition
Experience shows that the development of roller bearing damage
on machines running in continuous operation takes several months.
A measuring cycle of two weeks is therefore recommended for
the timely detection of such damage development with the aid of
trend monitoring. However, other cycles, e.g. one week or four
weeks, are also possible. The accuracy of roller bearing damage
is increased if the measurement is started on a new bearing.
The damage phase is reached when the measured values have
increased by a factor of 10 to 20.
Fig. 10-19: Trend of overall vibration and gSP value on a pump bearing; bearing
damage at the beginning of December.
To measure the gSP value, it is recommended to press the
HMA 1130/1140 acceleration sensor onto the measuring point
using a probe tip. The values determined in this way generally do
not agree with measured values obtained by screwing on or fixing
with a magnetic base. This is due to the different transmission
mechanisms of the vibrations in the kHz range with the different
sensor mountings. Nevertheless, measurements with accelera-
tion sensors attached directly to the measuring point can also be
used if the same measuring conditions are repeatedly maintained
and a trend observation is carried out.
1 Bearing damage
2 Spike energy
3 Vibration velocity
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