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February, 2016
Chestnut Ridge, NY — Teledyne LeCroy has intro- duced a new harmonics calculation option for the Motor Drive Analyzer (MDA800) series. This option- al software package enhances the standard capabili- ties of the Motor Drive Analyzer Software by adding advanced harmonic filtering for AC input and drive output numeric table measurements, total harmonic distortion (THD) measurement parameters for volt- age, current and power, and a new harmonic order table with spectral waveform displays. The standard software provides either full
spectrum (no harmonic filter applied) or funda- mental-only harmonic filters. The new option adds a fundamental+N and a range filter. The funda- mental+N filter allows the user to specify how
Teledyne LeCroy Releases Harmonics Calculation Software
Harmonic calculation option for motor analyzer software.
many (N) harmonics from the fundamental to include in the Numerics table calculations. The range filter is similar, but differs in that it
allows the user to specify a starting point for the range other than the fundamental. These filters provide the flexibility and capability that engineers need to isolate measurements and behaviors to spe- cific frequency bands in order to understand the harmonic heating effects in a motor winding, or to isolate specific harmonics and correlate them to cer- tain drive behaviors. This approach is superior to a simple low-pass filter with limited filtering scalabil- ity, especially for a variable frequency drive output where the output frequency changes dramatically under different operating conditions. The harmonics calculation op -
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tion adds THD measurement param- eters to the Numerics table display. As with other table parameters, users may observe the per-cycle behavior of these parameters by sim- ply touching the table parameter value to plot a per-cycle THD wave- form over time. This waveform is time-correlated with other wave- forms acquired by the MDA and can be used to correlate complex drive behaviors to other control or power system waveforms or to debug sys- tem problems. A new table displays a list of
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harmonic contributions for voltage, current and power by harmonic order. The table presents harmonic meas- urement values and spectral displays for up to nine waveforms. Users may perform calculations in both steady- state (fixed-frequency) and dynamic (variable-frequency) operating condi- tions. The fixed-frequency method provides capabilities similar to those found in a typical power analyzer (up to 100 harmonic orders). The varying- frequency mode uses a per-cycle dis- crete Fourier transform (DFT) and a software algorithm that overcomes the PLL bandwidth limits of a typical power analyzer and permits harmon- ic analysis under highly dynamic drive output operating conditions in which drive frequency is rapidly changing. Each of the per-order har- monic measurements results in a spectral waveform display. The wave- forms are displayed in bar graphs and contain bars which represent the har- monic order value for each harmonic order specified. The spectral wave- forms pin the surrounding frequency components to the harmonic orders, which results in a clean, easy-to-read display.
Contact: Teledyne LeCroy, 700
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Chestnut Ridge Road, Chestnut Ridge, NY 10977 % 845-425-2000 fax: 845-578-5985 E-mail:
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www.teledynelecroy.com
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