Welcome to the SeeMeCNC Community

I bought and installed a new 1.5kw water-cooled spindle with an inverter to run it. Inverter is https://www.valinonline.com/products/esv152n02yxb . Now whenever I switch the spindle on it triggers my limit switches (in Mach3) and I can only reset it when the spindle is not running. Would adding a line reactor to the inverter help? Spindle and limit switch wiring is all shielded and properly grounded.

I'm virtually at a standstill. Any help?

I would reconfigure your limit switches as normally closed. That will prevent electrical interference from generating false triggers.

g.