Rockwell Automation 1441-PEN25-Z Enpac 2500 Data Collector - Manual (Page 85)

Rockwell Automation Publication GMSI10-UM002D-EN-E - August 2012 85
Setting Up Measurements Chapter 2
Machine Speed (RPM) Measurements
• Set up a tachometer measurement definition by setting Data Type to
‘Numeric’ and Units to ‘RPM,’ ‘CPM,’ or ‘Hz.’
• Set up the tachometer transducer in the Transducer Calibration dialog
with Input type set to ‘ICP Accel’ for either the internal laser tachometer
or an external TTL device (such as entach laser sensor, an optical trigger, or
a strobe light with TTL output). Set the Input type to ‘AC Coupled’ or
‘DC Coupled’ if your speed sensor has an AC or DC voltage signal
proportional to speed. Set Units to ‘RPM,’ ‘CPM,’ or ‘Hz.’ Make sure you
enter the Calibration value that converts the voltage to speed.
• Set up a Collection Specification with Transducer set to the tachometer
transducer you set up above, Window set to ‘Rectangular,‘ and Signal
detection set to ‘None.’ Do not fill in any fields in the Resolution area or
the Averaging area of the dialog.
• Connect the speed sensor to the trigger connector on the Enpac 2500
when collecting data.
Magnitude Alarms in the Enpac 2500 Data Collector
You can use magnitude alarms with numeric measurements.
• The Enpac 2500 supports above, below, in window, and out of window
magnitude alarms with numeric measurements.
• You must set Trigger to ‘Yes’ for any alarms you want to appear in the
Enpac 2500 during data collection.
• For more on how Emonitor combines alarms before sending them to the
Enpac 2500,
see Alarms and the Data Collector on page 95 .
Typical Numeric Measurement Definitions
This figure shows the setup for typical numeric measurement definitions. The
first two measurements are numeric (DC) voltage measurements, and the third is
a numeric manual entry measurement.
Figure 16 - Numeric Measurement Definitions
The collection specifications appear in the table below. N/A means not applied.
Table 23 - Collection Specifications for Numeric Measurement Definitions
Transducer Window Signal Detection Fmax Lines Phase Order Norm? Averages
Temperature N/A RMS N/A N/A No No N/A
Tachometer N/A None N/A N/A No No N/A
Manual Entry N/A None N/A N/A No No N/A