CSI front end characteristics question

[MAGTiger]

Should it be considered normal for a CSI drive to draw significant triplen and even harmonics?
We are seeing as much as 14-18% even harmonic distortion and 10% 3rd harmonics. Total harmonic distortion is like 35%. The drive is running at about 50% of rated hp.

Neil

 

[davidbeach]

Even harmonics would suggest uneven firing of the SCRs (or other power electronics).

 

[DickDV]

Is it safe to assume that this is current distortion, not voltage?

 

[MAGTiger]

The voltage distortion is about 2-3%. There is s small amount of characteristic notching in the voltage wave.

Neil