Rockwell Automation 1440-VST02-01RA XM-120 Eccentricity Module - Manual (Page 56)

Publication GMSI10-UM010C-EN-P - May 2010
48 Configuration Parameters
Tachometer Signal Processing Parameters
IMPORTANT
If you are not using the tachometer channel, set the Pulses
per Revolution to zero. This will disable the tachometer
measurement, and prevent the module from indicating a
tachometer fault.
Tachometer Signal Processing Parameters
Parameter Name Description Values/Comments
Pulses Per Revolution The number of tachometer signal pulses per
revolution of the shaft (number of gear teeth). This
setting is useful if a proximity probe located over a
gear or shaft with a multi-toothed speed sensing
surface is used to generate the input signal. Enter zero if you are not using the
tachometer channel to disable the
tachometer measurement.
Note: The Eccentricity, Min Gap,
and Max Gap measurements will be
updated after the number of Pulses
per Revolution has occurred on the
tachometer channel. If Pulses Per
Revolution is set to zero, the
measurements will be updated after
the Eccentricity Update Rate has
elapsed.
Fault Time-Out The number of seconds the module should wait after
the last valid tach pulse before it indicates a
tachometer fault. Enter a value from 1 to 64 seconds.
Sets the trigger mode. In Auto Trigger mode, the
minimum signal amplitude for triggering is 2 volts
peak-to-peak and minimum frequency is 6 CPM (0.1
Hz).
In Manual Trigger mode, the value entered in
Trigger Threshold is used as the trigger point.
Minimum signal amplitude for triggering is 500
millivolts peak-to-peak and minimum frequency is 1
CPM.
Trigger Hysteresis The amount of hysteresis around the trigger
threshold. In Auto Trigger mode, the value entered is
a percentage of the peak-to-peak input signal. This
value can range from 0 to 50%.
In Manual Trigger mode, the value entered is a
voltage level. The hysteresis voltage is added to or
subtracted from the threshold voltage to determine
the hysteresis range. The minimum value is 0.12
volts.
% in Auto Trigger mode
Volts in Manual Trigger mode
Trigger Threshold
The signal level to be used as the trigger value when
in Manual Trigger mode. Enter a value from +16 to -16 volts dc.
Note: This value is not used in Auto
Trigger mode.
XM Configuration
Utility EDS File
Auto Trigger Trigger
Mode
XM Configuration
Utility EDS File
Check = Auto Mode Auto
Clear = Manual
Mode Manual