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Zero Crossing VI

LabVIEW 2013 Electrical Power Suite Help

Edition Date: June 2013

Part Number: 373375C-01

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Owning Palette: Utility VIs

Requires: Electrical Power Suite

Calculates the zero crossing indexes for a voltage and/or current waveform. Zero crossing is the instantaneous point at which the voltage or current turns from positive to negative or from negative to positive.

reset? specifies to restart the calculation process. The default is FALSE. When you run this VI for the first time, the calculation process restarts automatically.
waveforms in specifies voltage or current waveforms. Each array element represents one phase and contains samples representing 10-cycle time interval for a 50 Hz power system or 12-cycle time interval for a 60 Hz power system. Voltage waveforms are in volts and current waveforms are in amperes.
t0 specifies the start time of the waveform.
dt specifies the time interval in seconds between data points in the waveform.
Y specifies the data values of the waveform.
system info in specifies basic configuration of the electrical power system, which you generate from the Initialize System VI.
waveforms out returns voltage or current waveforms after zero crossing calculation.
t0 returns the start time of the waveform.
dt returns the time interval in seconds between data points in the waveform.
Y returns the data values of the waveform.
zero crossings returns zero crossing indexes.
samples since the last cross returns the number of samples since the last cross.
system info out returns information about the basic configuration of the electrical power system, which you can pass to further analysis.
error out contains error information. This output provides standard error out functionality.

 

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