I spoke with the our electrical systems specialist who was able to explain the phenomena that had occured on this system. Apparently the carrier frequency of the drive was 2khz and the resonant frequency of the building was hiting in right around the 33rd harmonic @ 1980hz. This was causing...
Hey Gunner.. thanks for the reply.
No filters, no isolation transformer. I'm not sure what parts of the drive were hit.
The (4) 10HP motors were connected to the ground buses on their respective VFD. After talking with AB, I was told that these drives have protective MOVs that are...
I thought this was interesting and wondered if anyone in the forum had any experience with it. I've been on the job and out of college for a year, so I have limited experience in most issues. The following is a simplification of the local system and the problem/issue description is how it was...
