Emerson AMS User Manual page 57

User Guide
MHM-97927-PBF
These are the equations that govern this curve:
These, however, are generic limits. They are provided as a starting point and these values
(for a 3600 RPM machine) are used as the default alert thresholds by the vibration
transmitter.
These levels were devised for periodic data collection with a portable vibration analyzer
and are set relatively low. For frequent automated monitoring, such as that offered by the
AMS Wireless Vibration Monitor, the levels can be increased for most balance of plant
equipment running between 900 and 4000 RPM. You can use the "rule of tens" as a simple
but effective approach to monitoring PeakVue on most rolling element bearing machines.
Using this guideline, we can assume the following:
Note
The appropriate alerts for a given machine will be a function of its design, service, and
turning speed.
Utilizing the embedded PeakVue technology, the AMS Wireless Vibration Monitor
identified developing problems at a couple of test sites during early field trials. In both
cases, the problem was not visible with conventional low-frequency analysis. The following
examples provide sample data from one of the sites. Notice in the example that the
velocity measurement is indicating less than 0.1 in/s. The PeakVue trend, however,
indicates high-frequency vibration that is regularly in excess of 6 g's.
MHM-97927-PBF, DRAFT
Level
0
10
20
40
Overall Velocity, PeakVue, and temperature
Interpretation
Machine is in good condition
Some problem is developing on the machine
The problem has become serious
Problem is critical
July 2020
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