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5-6
Measurement tasks
Runup / Coastdown
Phase, spectra (RPM)
Runup / Coastdown
Overall values (RPM)
Selecting the
measurement task
Starting the measurement
Overall value - RPM
Runup / Coastdown
The runup and coastdown curves record the changes in the
vibration behavior of the machine when it starts up or shuts down.
This analysis function can be used to determine the resonance
frequencies of a machine. The following types of measurement are
available for this purpose:
- Phase vector (amplitude and angle), dependent on the RPM
- Spectrum, dependent on the RPM
- Overall value, dependent on the RPM
Runup
Measurement is started before the machine is switched on. VIB-
XPERT records the current RPM and automatically begins with
measurement as soon as the selected start RPM is exceeded.
Measurement is stopped when the stop RPM is reached.
Coastdown
Measurement is started while the machine is running at the
operating RPM. VIBXPERT then begins to measure the RPM
continuously. Once you have switched the machine off and it
drops below the selected start RPM, VIBXPERT automatically starts
recording the data. Measurement stops once the selected stop RPM
is reached. Start and stop RPMs are defined in the measurement
setup (see p. 3-22).
A. Selecting the measurement task
The measurement tasks for a runup / coastdown curve are located
in the 'Advanced' tab. The measurement types 'Phase - RPM' and
'Spectra - RPM' are assigned a task icon; the 'Overall Value - RPM'
measurement type has its own icon.
Left:
Right:
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