Page 106 - Condition Monitor User Manual

Viewing Measurement Data

9.1. Viewing EV Data

EVView is used to view and analyze EV data. Data can be viewed as summary
numbers, raw data, frequency spectra, trends over time and visually with the Operational
Deflection Shape (ODS) view.

Note:
EVView can display data from multiple generations of Iris Power LP
EV monitors. The capabilities of these monitors are different, so some
features may not be available. These will be described on a case-by-
case basis.

9.1.1. EV Data Basics
There are two basic types of EV measurements:

• Summary measurements – these contain measurement results (summary numbers),
but not the raw data that was used to calculate the results. Summary measurements
are useful for long-term trending.
• Full measurements – these contain the summary results plus the original waveforms
read from the EV inputs on the monitor. It can be viewed as spectra, raw waveforms
and ODS (depending on the monitor that collected the data).

Summary numbers for EV measurements include:
Summary Number Definition
Overall Acceleration This is the peak acceleration recorded at all
frequencies.
Overall Velocity This is the peak velocity recorded at all
frequencies.
Overall Displacement This is the peak-to-peak displacement
recorded at all frequencies.
Total Displacement This is the peak-to-peak displacement
recorded at all frequencies.
For linked sensors, this summary number
results from a vector analysis of 2 axes.
For sensors that are not linked, this
summary number will be the same as
Overall Displacement.
1x Displacement Amplitude This is the peak-to-peak displacement
recorded at the asset’s rotating
frequency.
1x Displacement Phase This is the phase difference recorded at the
asset’s rotating frequency.
2f Displacement Amplitude This is the peak-to-peak displacement
recorded at twice the asset’s operating
frequency.
2f Displacement Phase This is the phase difference recorded at
twice the asset’s operating frequency.

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