22 S&C Instruction Sheet 1023-550
Using IntelliLink Software to Locate Problems
Power Harmonics
The capacitor control calculates the 1st (fundamental), 3rd, 5th, 7th, and 9th harmonics,
as well as the total harmonic distortion (THD), every 15 minutes. The Total RMS value is a
24-hour total of all RMS harmonics. When the log is full, each new value overwrites the
oldest value in the log.
Harmonics are expressed as a percentage of the fundamental. Total harmonic distor-
tion is calculated as the ratio of the total RMS harmonic content to the RMS level of the
fundamental.
Frequency
This is the nominal operating frequency in use. For more information, see Page 3 of the
Setup>General
screen.
Neutral Sensor Alarming
This is the component or components of the neutral current used to trigger the
Neutral
Sensing
alarm.
Voltage Harmonics
This column shows the most recently calculated harmonics for the single-phase voltage
powering the control.
Neutral Harmonics
This column shows the most recently calculated harmonics for the neutral current or neutral
voltage where the neutral sensor is installed.
Current Harmonics (var controls only)
This column shows the most recently calculated harmonics for the single-phase current
where the current sensor is installed.
Power Harmonics Data Logged
This setpoint selects the ty pe of ha r monic data the control records in the
Selected Sensor Harmonics Analysis
log: voltage, current, or neutral voltage/neutral
current, as applicable.
THD Formula
This setpoint selects the harmonics calculation method for data the control records. The
options are IEC (the default) or IEEE.
