466 Rockwell Automation Publication 1426-UM001J-EN-P - August 2019
Appendix G IEEE 1159 Power Quality Event Classification
The power monitor records each detected power quality event, date and time
stamp, trip point, min or max value, and associated waveform record, as
applicable, in the Power Quality Log with an event code of ‘IEEE1159
_Voltage_Sag’, ‘IEEE1159_Voltage_Swell’ or ‘IEEE1159 _Voltage_Interruption’.
Related Functions
• Long Duration RMS Variations
•Waveform Recording
• Power Quality Log
Long Duration RMS
Variations (Category 3.0 -
Undervoltage,
Overvoltage, Sustained
Interruptions) (M6 and M8
model)
A sag or swell with a duration that exceeds one minute is classified as an
undervoltage or overvoltage, respectively. An interruption with a duration that
exceeds one minute is classified as a sustained interruption.
Setup
The Sag and Swell thresholds that are described in the Short Duration RMS
Variations section on page 465
also determine the operation of undervoltage and
overvoltage detection.
Operation
When the duration of a sag or swell event exceeds 60 seconds, the new
classification is recorded in the power quality log with the time stamp of the
original sag or swell event, and the original sag or swell record in the power
quality log is updated with a duration of 60 seconds and its associated waveform
recording.
Status
The Status.Alarms Data Table provides the following tags for monitoring of long
duration rms variations.
• IEEE1159_Over_Voltage
• IEEE1159_Over_Voltage_V1
• IEEE1159_Over_Voltage_V2
• IEEE1159_Over_Voltage_V3
• IEEE1159_Under_Voltage
• IEEE1159_Under_Voltage_V1
• IEEE1159_Under_Voltage_V2
• IEEE1159_Under_Voltage_V3
The alarm flags are released when the condition no longer exists.
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