Typical Shock Impulse Diagrams; Bearing In Good Condition; Bearing Damage Of Foreign Matter In The Lubricant - WAGO 750-645 Manual

2.2.5 Typical Shock Impulse Diagrams

2.2.5.1 Bearing in Good Condition

Peak values between 0 dBn and 20 dBn do not require a further analysis. The
bearing is in good condition. Brand-new bearings and small needle roller
bearings may show values below 0 dBn. Such low values, however, should be
verified since they could be caused by a wrong measuring position or a faulty
measurement.
Fig. 2.2.5-1: Bearing on good condition
Note
Extremely low measured values may be frequently caused by wrong measuring
locations or an erroneous measuring position.

2.2.5.2 Bearing Damage of Foreign Matter in the Lubricant

Occasional high peak values beyond 35 dBn and a low carpet value indicate
that a bearing damage is in progress or that foreign matter is contained in the
lubricant. The bearing should be re-lubricated or the lubricant requires
analysis, prior to the decision of a bearing exchange.
Fig. 2.2.5-2: Bearing damage or foreign matter in the lubricant
WAGO-I/O-SYSTEM 750
I/O-Modules
Machine Condition Monitoring with VIB-I/O Modules
dB
N
60
40
20
0
dB
N
60
40
20
0
Condition Monitoring
poor
limited
good
Time
poor
limited
good
Time
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