Rockwell Automation 1441-PEN25-Z Enpac 2500 Data Collector - Manual (Page 272)

272 Rockwell Automation Publication GMSI10-UM002D-EN-E - August 2012
Chapter 10 Run Up/Coast Down Application
Spacing Controls the spacing between collected spectra.
• Delta RPM- A fixed speed change between spectra.
• % Delta RPM- A percentage speed change between spectra.
• Delta Time- A fixed time interval between spectra.
• Delta RPM+Delta Time- A combination of speed and time interval
settings. If speed stops changing then spectra are calculated using
the Time Interval value.
• % Delta RPM+Delta Time- A combination of speed and time
interval settings. If speed stops changing then spectra are
calculated using the Time Interval value.
Options:
Delta RPM
% Delta RPM
Delta Time
Delta RPM+Delta Time
% Delta RPM+Delta Time
Your selection affects the Speed Interval and Time
Interval settings.
Speed Interval (RPM) Sets the speed interval used in calculating FFT spectra. 1…240 RPM
Note: This parameter not used when Spacing is set
to ‘Delta Time.‘
Time Interval (sec) Sets the time interval used in calculating FFT spectra. .001…604800 seconds
This parameter is not used when Spacing is set to
`Delta RPM‘ and `% Delta RPM.‘
Display Units Sets the Y-axis units. The available units depends on the transducer
used to collect data.
See Table 44 on page 258 .
Detection Sets the signal detection and scaling display for the plot.
• Peak - Measured RMS value multiplied by the square root of two
(1.4142).
• Pk-Pk - Measured RMS value multiplied by two times the square
root of two (2.8284).
• RMS - Root mean squared signal level of the input signal.
Options:
RMS
Peak
PkPk
Lines The number of lines (bins) of resolution for the FFT spectra. The larger
the number of lines, the better the frequency resolution of the
measured data in the spectra.
Similarly, the higher the number of lines, the longer it takes to display
the spectra in the plot. Options:
100
200
400
800
1600
3200
6400
12800
X-axis Sets the x-axis frequency units for displaying spectra/FFT data.
• Hz - Displays spectra in Hertz, cycles per second.
• CPM - Displays spectra in cycles per minute.
• Orders - Displays spectra in orders of the operating speed. Options:
Hz
CPM
Orders
Your selection affects the Freq Range and LF Cutoff
parameters.
Freq. Range (EU) The maximum frequency for the measurement. 10…2000 Hz
600…120000 CPM
.001…166 Orders
The frequency range is determined by the X-axis
parameter.
Table 49 - Waterfall Plot Parameters
Parameter Name Description Values/Comments