Power quality analysis functions
11.2 Harmonics analysis
Analog input module AI Energy Meter 480VAC/CT HF (6ES7134-6PA00-0CU0)
90 Manual, 07/2018, A5E42674880-AA
The AI Energy Meter HF can determine the effective values for current and voltage up to the
40th harmonic of the fundamental.
The harmonics of the voltage are stored in the data record DS 161 (Page 261).
The harmonics of the current are stored in the data record DS 163 (Page 265).
In addition, you can incorporate the results on IDs with the parameter data records
DS 130/DS 131 (Page 157) in the user-defined user data and DS 135 (Page 160) in the
user-defined data record DS 151 (Page 258).
The calculation of the harmonics takes several cycles. To determine whether calculation is
completed, evaluate the Bits 0 to 5 in the power quality analysis data record DS 160
(Page 259) in Byte 218. If the value 63 is in the Bits 0 to 5, the calculation is completed and
the measured values are available.
Note
While the calculation is in progress, you cannot read the data records DS 161 and DS 163.
ulation is in progress, quick measured value acquisition (e.g. for controlling
-power compensation) is not possible.
● The parameter "Power quality analysis function" is activated.
● The parameter "Analyse harmonics" for the corresponding phase must be released.
Voltage and current are always analyzed simultaneously for the enabled phases.
The harmonics analysis starts by setting the DQ bit 6 "Power quality analysis Start/Stop
L1L2L3" in Byte 12 of the output data. The results of a previous analysis of harmonics are
deleted in the process. Results of non-selected channels are "0". If channels which have not
yet been analyzed are added, the data are not plausible at the start of the analysis.
If the DQ bit is reset during an ongoing analysis, the analysis stops.
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