ST_PMA_PowerValues_Period_InitPars

Function block-specific structure with initialization parameters which are evaluated when the function blocks FB_PMA_PowerValues_Period_1Ph and FB_PMA_PowerValues_Period_3Ph are initialized.

Syntax

Definition:

TYPE ST_PMA_PowerValues_Period_InitPars :
STRUCT
    nBufferLength              : UDINT := 200;   // Length of input buffer
    fSampleRate                : LREAL := 1000;  // in Hz
    fMinInputCurrent           : LREAL := 0.0;   // Minimal input of current (RMS) to calculate outputs
    nPeriods                   : UDINT := 1;     // Amount of signal periods to calculate outputs
    fNominalVoltage            : LREAL := 230.0; // Nominal voltage, required for PQF calculation
    fNominalFreq               : LREAL := 50.0;  // Nominal frequency, required for PQF calculation
    ePqfMode                   : E_PMA_PqfMode := E_PMA_PqfMode.Default; // Mode of PQF calculation
    uTimeLagCurrentTransformer : U_PMA_Timelag := (fTimeLag := 0);       // Timelag caused by inductivity of current transformer ( in s
END_STRUCT
END_TYPE

Parameters

Name	Type	Parameters
nBufferLength	UDINT	Length of the input buffer
fSampleRate	LREAL	Indicates the sampling rate (samples per second) of the input signal.
fMinInputCurrent	LREAL	Minimum input value (RMS) of the current. This prevents the calculation of input values that are too small.
nPeriods	UDINT	Number of signal periods for calculating the output values
fNominalVoltage	LREAL	Nominal voltage value. Is required for the calculation of the Power Quality Factor.
fNominalFreq	LREAL	Nominal frequency. Is required for the calculation of the Power Quality Factor.
ePqfMode	E_PMA_PqfMode	Mode for calculating the Power Quality Factor. Default: Calculation of the Power Quality Factor with the frequency, the RMS value of the voltage as well as the THD of the voltage. DefaultAndUnbalance: As Default, but in a three-phase system the voltage unbalance is also included in the calculation.
uTimeLagCurrentTransformer	U_PMA_Timelag	Here, the possible delay due to the inductance of the current transformer can be specified in seconds. U_PMA_Timelag.fTimeLag: Identical for all phases U_PMA_Timelag.aTimeLag: Individual per phase

Requirements

Development environment	Target platform	PLC libraries to include
TwinCAT v3.1.4024.0	PC or CX (x86, x64)	Tc3_PowerMonitoring