Hi Andy. Didn't see an answer to your question about VFD harmonics. I fitted an emi filter from the mains to the input of my control box using one of these https://www.ebay.co.uk/itm/EMI-RFI-F...edirect=mobile . This plus star farthing all the shielded cabling eliminates the problem I had when the vfd was running (false estops). Also mounted my vfd external to the controller again to avoid electrical noise getting through.