Originally Posted by windmiller
Hi,
I found this post:

Bipolar Transistor technology began superceding SCRs in drives in the mid-1970s. In the early 1990s, those gave way to using Insulated Gate Bipolar Transistor (IGBT) technology, which will form the basis for our discussion.

Thanks

Windmiller


You are confusing the output of the drive with the input. IGBTs are used on the output only.

Most VFDs use diode bridge input sections, however I believe the A-B still offers SCRs as an option.

If lightning was causing your drives to fail, then you should have other components in your facility also affected. It is unlikely that the A_B factory could differentiate between a lightning induced over voltage and one caused internally to your facility.