Harmonic Analysis - Allen-Bradley Powermonitor 3000 User Manual

8-6 Advanced Features

Harmonic Analysis

Publication 1404-UM001D-EN-E - October 2004
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Trigger Statistics
The trigger source and capture identifier are combined in one
element, and indicate what triggered the capture and a unique capture
identifier or serial number. The value divided by 1,000 gives the
trigger source: 0 = none; 1 to 20 = setpoint number; 21 = native
communications; 22 = optional communications. The remainder of
this calculation is the unique capture identifier which increments by 1
from 0 to 999 and rolls back to 0. A client application may use the
identifier to associate with an event log entry and determine
chronological order of captures. Example: a parameter value of 15347
indicates that setpoint 15 triggered the capture and its serial number
or identifier is 347.
The trigger position returns the number of the data point
corresponding with the time the capture was triggered. A client
application may use this to place a marker on the displayed
waveform. The maximum trigger position is the same as the total
number of oscillogram data points. The Powermonitor 3000
configuration may affect the accuracy of the trigger position statistic
with respect to the pre-trigger setting. For best results, set RMS
resolution to 0 (nominal) and RMS results averaging to 0 (none) in
Table A.6 Advanced Device Configuration.
The capture timestamp and capture type are also important statistics
that identify the capture and enable a client application to correctly
display the waveform.
The Powermonitor 3000 provides harmonic data to help you
understand this important element of power quality in your facility.
Each model provides a different level of harmonic information.
Table 8.2 provides an overview of the harmonic analysis available in
each model. You may access all harmonic data using communications.
The Display Module can access average values of the parameters as
indicated in the DM column.
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