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Old July 25th, 2009, 10:28 PM   #1

plcsoftvsd is offline
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Harmonics Level in PLC panels.

What is the maximum THD (Total harmonic Distortion) ie. THD (I) and THD (V) a PLC/Electronics can withstand?

I am asking this because in one PLC based Reverse Osmosis plant we have 75 kw VSD inbuilt in the panel with PLC.
We measured 27% THD(I) and 3 % THD (V).

We have had faults in few electronic components especially capacitors on Boards.

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Old July 25th, 2009, 10:39 PM   #2
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Can't speak to the exact measured levels, but I've seen panels with 125hp VFDs in the same enclosure with the PLC and no notable issues.

I wonder about the components IN the VFD.....

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