Rockwell Automation 1441-DYN25-Z Dynamix 2500 Data Collector - Manual (Page 184)

184 Rockwell Automation Publication 1441-UM001B-EN-P - September 2012
Chapter 6 Multi-channel Measurements
In all cases, the same filters, integrator, and Fmax are used on both channels.
However, input range and coupling are independent.
For cross channel phase, dual time and dual spectrum measurements, if the
collection specification is Overall and Spectrum or Overall Only, then the overall
value is calculated from the spectrum as an RSS overall. There is no support for
two channel analog overalls.
Triggerless Operation
Most two channel measurements use a trigger to establish running speed.
However, the running speed can be manually entered, or taken from a spectrum
by positioning the cursor on the 1X spectral peak.
Orbits typically require a trigger. If you don’t define a trigger, the display shows a
random moving cursor around the trace and has no useful meaning. Therefore,
the cursor is not displayed when operating in triggerless mode with orbits. With
orbits, the specified rpm value is used to set both the Fmax and the frequency
used to configure the orbit input filters.
Set Up Cross Channel Phase Measurement Definitions in the
Emonitor Software
To set up the cross channel phase measurements in the Emonitor software, follow
these steps.
1. Select the machine that you want to set up cross channel phase
measurements.
2. In the Location pane, create the first location and set Lo. Channel to 1.
3. In the Measurement Definition pane, create the magnitude measurement
definition by setting Data Type to Magnitude.
4. Set Collection to the collection specification that you created for the cross
channel phase. Select a band Filter, for example, 1st Order.
5. In the Location pane, select the new location that you just created. Choose
Edit > Copy to copy the location.
6. Move to an empty row in the Location pane and choose Edit > Paste to
paste the new location into the spreadsheet.
7. Edit the new location. Make sure you set Lo. Channel to 2.
8. Include these locations in a list. You can create a new list or recall the
current list. The locations must be tagged to create a group list.