VFD interference problem

[eurikain]

Hello everyone,

I've been struggling with EMI problems with my VFD. The second my spindle starts spinning, my motors start doing uncommanded moves. Last week it was obvious since I didn't use any shielded cable for the spindle and inside the control box.

However, yesterday I replaced ALL the cables going out of my control box with CY cable. Also, all small uncovered sections (close to the motors for example) are wrapped in aluminium foil and covered by a protective sleeve. In the control box, I replaced most signal wires with CY cables: drivers to connectors, VFD to spindle connector, BOB to VFD (FOR and speed control). I also connected all the screens inside the control box to the earth.

Still getting EMI, and it hasn't changed one bit.

I don't have good pictures of the control cabinet after I changed to CY cable, because I don't have a proper camera with me today. However, I did take a photo with my laptop so the quality is not goo but it'll give you a good idea. Plus, I add older photos of the control cabinet that were made BEFORE I used CY cables.

Before CY:








After CY:






I'm pretty depurate now.. the only solution I see really is to take the VFD out of the control cabinet, power it completely separately from it and just pulling a connection from the control cabinet / BOB to the VFD for Mach3 control.

Can anyone please advise me ? Please don't judge my machine or control cabinet, this is my first build ever, and I am far from being an expert and this is the best I could do with what I know so far.

Thanks a lot !

All the best,
G.