Rockwell Automation Publication 1426-UM001J-EN-P - August 2019 465
IEEE 1159 Power Quality Event Classification Appendix G
Operation
The power monitor detects a transient when the RMS value of the transient
voltage is greater than a configurable sensitivity threshold.
When a transient is detected, the power monitor captures a waveform record.
The number of cycles that are captured is equal to the configured Pre Event and
Post Event cycles plus the transient waveform. The Power Quality Log records
the event details, including date and time, the waveform reference, the transient
threshold, and the RMS value of the transient voltage in the present cycle.
Status
The Status.Alarms data table provides the following tag for monitoring of
transient events.
• Transient_Indication - sets when a transient has occurred; clears 90
seconds after the transient event has ended.
Related Functions
•Waveform Recording
• Power Quality Log
Short Duration RMS
Variations (Category 2.0 -
Sags, Swells, and
Interruptions) (M6 and M8
model)
The power monitor detects and records instantaneous, momentary, and
temporary variations in the RMS voltage.
Setup
Basic metering configuration is required.
Operation
A sag event begins when the rms value of the voltage dips to less than 90% of the
system nominal voltage and ends when the voltage exceeds 92% of nominal.
A swell event is activated when the rms value of the voltage rises to greater than
110% of the nominal system voltage and released when the voltage drops back to
108% of nominal. An interruption event is recorded where the residual voltage is
less than 10% of nominal.
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