Rockwell Automation 1404-M4_M5_M6_M8 Powermonitor 3000 User Manual, Firmware rev. 3.0 or LATER - Manual (Page 174)

174 Publication 1404-UM001F-EN-P - November 2009
Chapter 8 Advanced Features
In the Harmonic Results; Odd Harmonics 23…41 , Harmonic Results;
Even Harmonics 2…20 and Harmonic Results; Even Harmonics
22…40 tables the first nth harmonic element is reserved and returns a
value of 0.
Sag and Swell The Powermonitor 3000 M6 and M8 models are capable of detecting
voltage sags and swells. There are many definitions for sag and swell.
IEEE 1159
1
defines sag as:
a decrease to between 0.1…0.9 pu in rms voltage or current at
the power frequency for durations of 0.5 cycle to 1 minute.
IEEE 1159
1
defines swell as:
an increase in rms voltage or current at the power frequency for
durations from 0.5 cycles to 1 minute. Typical values are
1.1…1.8 pu.
Sag and Swell
The pre-defined setpoint configuration for the detection of sag and
swell is based on the IEEE-1159 standard. Although the default
setpoint configuration is applicable as-is for many sag and swell
applications, it may be necessary to alter the setpoint configuration to
adjust the unit’s sensitivity to sags and swells for your particular
application.