Rockwell Automation Publication 1426-UM001J-EN-P - August 2019 103
Power Quality Monitoring Chapter 5
Setup
Basic metering configuration is required:
• All models include fixed thresholds for sag and swell alarming: 90% of
nominal for sags, 110% of nominal for swells, each with a 2% of nominal
hysteresis.
• In the M6 and M8 models, multi-level sag and swell thresholds and
hysteresis are user-configurable and can be adjusted by use of the
Configuration.PowerQuality web page or data table. The parameters are
listed in Ta b le 14
. Defaults have been selected to effectively disable user-
configurable sag and swell detection, to avoid creating redundant events in
the Power Quality Log.
Operation
The power monitor detects a sag when any phase voltage varies below the fixed
sag threshold. A swell is detected when any phase voltage exceeds a swell
threshold.
Sag and swell detection operate on line-to-line voltages in Delta wiring modes,
and on line-to-neutral voltages in Wye and split-phase wiring modes.
Table 14 - Multi-level Sag and Swell Configuration Parameters
Parameter Default Range
Sag1_Trip_Point_% 0% 0.00…100.00
Sag1_Hysteresis_% 2% 0.00…10.00
Sag2_Trip_Point_% 0% 0.00…100.00
Sag2_Hysteresis_% 2% 0.00…10.00
Sag3_Trip_Point_% 0% 0.00…100.00
Sag3_Hysteresis_% 2% 0.00…10.00
Sag4_Trip_Point_% 0% 0.00…100.00
Sag4_Hysteresis_% 2% 0.00…10.00
Sag5_Trip_Point_% 0% 0.00…100.00
Sag5_Hysteresis_% 2% 0.00…10.00
Swell1_Trip_Point_% 200% 100.00…200.00
Swell1_Hysteresis_% 2% 0.00…10.00
Swell2_Trip_Point_% 200% 100.00…200.00
Swell2_Hysteresis_% 2% 0.00…10.00
Swell3_Trip_Point_% 200% 100.00…200.00
Swell3_Hysteresis_% 2% 0.00…10.00
Swell4_Trip_Point_% 200% 100.00…200.00
Swell4_Hysteresis_% 2% 0.00…10.00
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