Rockwell Automation 1426 PowerMonitor 5000 Unit - Manual (Page 83)

Rockwell Automation Publication 1426-UM001F-EN-P - November 2013 83
Power Quality Monitoring Chapter 5
Operation
A sag event is activated when the rms value of the voltage dips to less than or
equal to a sag trip point and released when the voltage again exceeds the same sag
trip point plus its hysteresis value.
A swell event is activated when the rms value of the voltage rises to greater than or
equal to a swell trip point and released when the voltage drops back to the same
swell trip point less its hysteresis value.
The PowerMonitor 5000 unit records each detected power quality event and
associated waveform record, as applicable. For example, with the default sag and
swell configuration values, the rms value drops to between 90% and 80% for one
second. The rms value then drops to between 80% percent and 70% for one
second. In the next cycle the rms value returns to normal.
In this case, the log records two events, one with two seconds below Sag1 Trip
Point and another with one second below Sag2 Trip Point. Because Sag1 is the
first event, the time stamp becomes the main event trigger time stamp.
According to the classifications defined in IEEE 1159 this event is classified as
Momentary Short Duration of RMS Variation with a total time of two seconds.
Related Functions
• Long Duration RMS Variations
• Waveform Recording
• Power Quality Log
Sag5_Hysteresis_% 2 0.00…10.00
Swell1_Trip_Point_% 110 100.00…200.00
Swell1_Hysteresis_% 2 0.00…10.00
Swell2_Trip_Point_% 120 100.00…200.00
Swell2_Hysteresis_% 2 0.00…10.00
Swell3_Trip_Point_% 140 100.00…200.00
Swell3_Hysteresis_% 2 0.00…10.00
Swell4_Trip_Point_% 180 100.00…200.00
Swell4_Hysteresis_% 2 0.00…10.00
Table 15 - Sag and Swell Configuration Parameters
Parameter Default Range