Guidelines for setting the full scale value, Appendix d, Appendix – Rockwell Automation 1440-VAD02-01RA XM-123 Aeroderivative Module User Manual
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Publication GMSI10-UM003D-EN-P - May 2010
Appendix
D
Guidelines for Setting the Full Scale Value
Appendix D provides tables to help you determine the optimal value to use for
the Full Scale setting in the XM-123 module. The signal conditioning circuitry
in the modules adjusts its dynamic range based upon the value entered in this
setting. The full scale value is a voltage level that is dependent upon your
monitoring application and other XM configuration settings.
In order to use these tables and to properly select the Full Scale value, you
need to know the following information.
•
Maximum Vibration Level - This is the maximum instantaneous peak
vibration level that can be expected at the sensor location (under any
monitoring condition) in the units of vibration that will be used for
monitoring. For example, if monitoring will be done in velocity then you
must know the maximum vibration in ips or mm/s that can exist at the
machine.
•
High Pass Filter (HPF) Setting - In applications that require
integration of the native units, the high pass filter setting impacts the full
scale signal range. For example, an application that uses an
accelerometer whose native units is g’s, and is integrated to provide a
velocity output in ips or mm/s, requires you to know what high pass
filter setting is used in order to best select the Full Scale value.
•
Maximum High Frequency Peak Amplitude (in g’s) - This variable
must be considered in applications where an acceleration input is
integrated to velocity (ips, mm/s) or displacement (mils, µm) and where
high frequency (>5 kHz) acceleration signals are likely present. Such
signals are most common in machinery such as gear sets and any
machine that is fitted with rolling element bearings. This variable can be
measured with a portable instrument or it can be measured using the
XM module and associated configuration tool.
TIP
Refer to Channel Transducer Parameters on page 50 for
more information on the Full Scale parameter.