470 Rockwell Automation Publication 1426-UM001J-EN-P - August 2019
Appendix G IEEE 1159 Power Quality Event Classification
Setup
Basic metering setup is required. One configuration parameter for flicker is found
in the Configuration.PowerQuality
table.
• IEEE1159_ShortTerm_Severity - alarm threshold for flicker;
range 0.2…4 P
st
, default 1
Operation
The power monitor calculates the flicker severity index. When the configured
limit is exceeded, an alarm status is set and a record is added to the Power Quality
log. The values of P
st
and P
lt
are also tracked in the Min/Max log.
Status
The Status.Alarms data table provides the following tag for monitoring of short-
term flicker events.
• IEEE1159_ShortTerm_Flicker_Condition, set when P
st
exceeds the alarm
threshold, clears when P
st
returns to normal
Related Functions
•Min/Max Log
• Power Quality Log
Power Frequency
Variations (Category 7.0)
The power monitor detects and reports short-term power frequency variations in
excess of configured limits.
Setup
Basic metering setup is required. These configuration parameters are found in the
Configuration.PowerQuality tab:
• IEEE1159_PowerFrequency_Averaging_Intvl_s - rolling average interval
for power frequency, range = 1 (default)
…10 seconds
• IEEE1159_PowerFrequency_Limit_Hz - power frequency variation alarm
threshold, range = 0.1 (default)
…0.2 Hz
• IEEE1159_PowerFrequency_Hysteresis_Hz -power frequency hysteresis,
range = 0.01
…0.05 Hz, default = 0.02 Hz
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