The Shock Impulse Peak Value - WAGO 750-645 Manual

Fig. 2.2.3-2: Low carpet value
The carpet value rises when the lubrication layer decreases and rolling path
and roller bearing touch at more and more locations. The following diagram
shows an increased carpet value.
Fig.. 2.2.3-3: Increased carpet value
The carpet value helps to pinpoint the cause for limited or poor operating
conditions.

2.2.3.4 The Shock Impulse Peak Value

Bearing damages (i.e., relatively large roughness of the surfaces) result in
individual, very high shock impulses (see illustration below). In some cases,
this can be heard through a screwdriver pressed to the bearing. The highest
shock impulse values measured at a bearing are called peak value (or
maximum value) and are shown in dBM (decibel maximum value). The peak
value (
already existing bearing damages. The following diagram shows shock
impulses indicating a bearing damage.
WAGO-I/O-SYSTEM 750
I/O-Modules
Machine Condition Monitoring with VIB-I/O Modules
) provides information to the operating conditions of a bearing and
Condition Monitoring
dB
N
60
40
20
0
dB
N
60
40
20
0
• 15
poor
limited
good
Time
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poor
limited
good
Time
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