I am working on bringing up a blackbox controller on a Cnc4Newbie machine. I am currently testing the integration of the VFD spindle/relay and that seems to be working fine, but with a catch. When I fire up the spindle, i lose communication with the controller. I can adjust the +10 output voltage to get the proper RPM but cannot communication with the controller. I have to power down the controller and restart. I read a thread about interference with the VFD signals and removed the VFD cable from the tracks. I now have the VFD running overhead with the water lines. This is a 220v spindle and the regular Chinese inverter. It does trigger the IoT relay when it powers up the spindle. I also have a USB filter on the computer but that didn't seem to make a difference. I plan to test manually starting the spindle today, but wanted to see if there were any glaring issues I have missed. Thanks!
VFDs put out a tonne of EMI interference You'll need to add some mitigation against that EMI: - space VFD inverter away from other electronics, ideally in a grounded metal enclosure - use shielded wire between inverter and spindle and space away from any other wiring - make sure spindle body is earthed - add ferrite cores on all other wiring, usb cable with ferrites will help too - avoid USB hubs, go as short and direct as possible One of the big disadvantages of a VFD over a router sadly
Definately. High inductance motor, high rpm, 400hz 3 phase AC, and the chinese cost cutting all come together for a perfect storm (more expensive inverters have built in noise suppression)
