Originally Posted by
good-ham
I have a potential noob question about EMI filters. I'm about to add a spindle to my CNC Router (currently using an actual 120v router), which will require installation of a VFD. Because of all the EMI issues I've read about in other threads, I'm trying to make sure I ground properly, etc, but I'm running into issues on an EMI filter for the incoming 240v mains. I've looked at most of the EMI filters I see commonly discussed in the threads (e.g. Schaffner FN2060-20-06), as well as those I find when I search for 240v single phase EMI filter, and their wiring diagrams have lugs for L and N on the line side. That would seem suitable for countries where mains are 240v line with a separate neutral, but in the US, 240v circuits are split phase, with L1 and L2 - each with 120v, 180 degrees out of phase between them - and without a neutral line, so I'm not sure if those would work. What EMI filters are others using for 240v setups in North America? FWIW, I'm hooking up a HY04D023B VFD driving a 3.2kw water cooled Chinese spindle.
Thanks,
Greg