Harmonics Period 3Ph

The Harmonics Period module calculates the harmonics of current and voltage. In addition, the THD of the input values is calculated from the harmonics. In contrast to the module Harmonics, the results refer to a configurable number of signal periods. The period duration refers to the frequency specified at the input at the start of the period. The statistical results refer to the entire runtime or the time at which the statistical results were last reset.

In the Beckhoff Information System you will find the documentation for the corresponding PLC function block FB_PMA_Harmonics_Period_3Ph.

In the Beckhoff Information System you will find the documentation of the TF3650 TwinCAT 3 Power Monitoring function with descriptions of the corresponding PLC library.

Configuration parameters

Buffer Length: Length of the input buffer.

Sample Rate [Hz]: Sample rate (samples per second) of the input signal.

Min Input Current [A]: Minimum input value (RMS) of the current. This parameter prevents the calculation of input values that are too small.

Periods: Number of periods that influence the calculation. (Period length = sample rate/frequency).

Num Harmonics: Number of harmonics to be calculated.
Transform To Percent: Boolean value that specifies whether the result should be output as a percentage. The first harmonic corresponds to 100%.

Input values

Frequency: Current frequency of the input signal. Is used to determine the length of the period at the beginning of a period. The output of the Frequency Period1 Ch module can be used.
Input Voltage 1 .. Input Voltage 3: Input values of the voltage.
Input Current 1 .. Input Current 3: Input values of the current.
Reset Statistics (optional): TRUE resets the min. and max. values of the outputs.

Output values

THD U: THD of the voltage. The output is in percent.
THD U Min: Minimum THD U value that has occurred. Can be reset via the Reset Statistics input.
THD U Max: Maximum THD U value that has occurred. Can be reset via the Reset Statistics input.
THD I: THD of the current. The output is in percent.
THD I Min: Minimum THD I value that has occurred. Can be reset via the Reset Statistics input.
THD I Max: Maximum THD I value that has occurred. Can be reset via the Reset Statistics input.
Harmonics Voltage: Harmonics of the voltage.
Harmonics Current: Harmonics of the current.