Coast-down/Run up
Note: This feature is not available on the vbBalancer instrument
model.
Coast-down and run-up measuring involves taking a series of
recordings with a short delay between them. This technique can be
used to study the resonance behavior of a machine as its speed
gradually increases during power-up, or decreases during
coast-down.
• From the Main Menu press Measure Vibration then
press Coast Down/Up.
• Use the left-hand arrow keys to select a parameter set or
press to create a new one and set the parameters as
required.
• Press and select the machine location to save
measurements to, then press again to begin measuring.
After the first spectrum has been recorded switch off the
machine, or begin ramping its speed up or down.
• Once the machine has stopped rotating, or its speed has
been fully adjusted, press to stop measuring and return
to the Coast-down/Run-up Menu.
The measurement location will contain a large number of
measurements.
Recommendations
We recommend using a tachometer to obtain the RPM reading for
each measurement as this aids interpretation.
You can set the Recording Interval as either a time interval between
recordings, or as a change in machine RPM. We suggest using the
latter, with the RPM Difference set to machine speed / 20. This will
result in approximately 20 recordings being taken during a complete
coast-down or run-up.
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