16
Figure 12: StatusCheck Vibration Parameters
Approximating Alarm Settings:
For a first approximation of alarm settings, gather data for base line
measurements on normally operating machines and record the readings
over about 20 minutes of data collection. Average the base line data. Set
the vibration warning threshold to be 1.5 times the base line average and
set the vibration critical thresholds to be 2.0 times the base line average
for the alarm conditions. These guidelines were established based on
previous lab and field test results and should be customized for specific
customer applications.
The user establishes alarm thresholds after determining the base line
measurements of a normally operating system. For example, if normal
operation of a machine is at a peak acceleration of 2 Gs with a standard
deviation of 0.6, a Kurtosis of 8, a velocity RMS of 7.62mm/s (0.3"/second)
and a temperature of 82.2° C (180° F), then alarm points could be set based
on these readings as follows:
Peak acceleration warning threshold = 1.5 x average = 3 G
Peak acceleration critical threshold = 2 x average = 4 G
Standard deviation warning threshold = 1.5 x average = .9 G
Standard deviation critical threshold = 2 x average = 1.2 G
Kurtosis warning threshold = 1.5 x average = 12
Kurtosis critical threshold = 2 x average = 16
Velocity RMS warning threshold =1.5 x average = 11.4mm/s
Velocity RMS critical threshold = 2 x average = 15.2mm/s
Summary of Contents for StatusCheck
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