The Evaluation Scale; Good Operating Condition; Limited Operating Condition - WAGO 750-645 Manual

Deciding factor for the planning of bearing changes is the trend measurement
and change analysis.
Continuous shock impulse measurements clearly show changes in the bearing
condition during operation.
Note
New bearings may require a break-in time, during which the base noise is
decreasing.

2.2.4.2 The Evaluation Scale

The roller bearing evaluation scale is divided in three stages:

1. Good operating condition

2. Limited operating condition

3. Poor operating condition
The subsequent diagrams show how carpet value and peak value can develop.
2.2.4.2.1 Good Operating Condition
The diagram below shows a bearing in a good operating condition. The low
carpet value indicates that the installation, lubrication and load are normal. A
peak value that is only little higher than the carpet value confirms this
evaluation.
Fig. 2.2.4-2: Good operating condition
A low carpet value indicates that the installation, lubrication and load are
normal.
2.2.4.2.2 Limited Operating Condition
A significant increase of both values is a first warning signal. A bearing
damage in the making only appears during limited operating condition. The
WAGO-I/O-SYSTEM 750
I/O-Modules
Machine Condition Monitoring with VIB-I/O Modules
dB
N
60
40
20
0
Condition Monitoring
poor
limited
good
Time
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