BECKHOFF DK9222-0909-0005 - Manual (Page 4)

XFC
XFC technology oversampling
Application Note DK9222-0909-0005
Practical applications: vibration analysis
Sampling of an analog input signal with the EL3632 IEPE terminal
EL3632
Fig.  Gear unit with sensor at the ball bearing
For the quality evaluation of a gear unit the built-in radial ball bearings are checked for faulty balls. Since faulty balls show
up in a vibration analysis, the bearing is run in a test rig with a vibration sensor. The sensor signal indicates the vibration
curve according to the IEPE standard and shows any vibrations. (The acronym IEPE stands for Integrated Electronics Piezo-
Electric and describes an industrial standard for piezoelectric sensors with built-in impedance transformer electronics. Other
manufacturer names for the same principle are ICP
® , CCLD, Isotron ® , Deltatron ® , Piezotron ® , etc.) For communication with a
higher-level analysis unit, e.g. a control PC, the values are transferred cyclically via a bus system. A more detailed temporal
resolution of the vibration can be achieved through reduction of the bus cycle time or through oversampling with a constant
cycle time. With a moderate bus cycle of 1 ms and high-resolution oversampling, even finely graded vibration amplitudes can
be represented, resulting in a computing time surplus that can be used for mathematical analyses.
New Automation Technology Beckhoff 
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