My 2'X4' CNC router has a 2.2 KW water cooled spindle and VFD - the typical Chinese kit off eBay.
http://www.ebay.com/itm/221354796303 I'm getting noise on the video signal that usually causes annoying screen jitter but sometimes blanks out the screen entirely, which can be a bit disconcerting when running a CNC machine. That sounds like RFI, but I used good shielded cable between the VFD and spindle motor. The shield is grounded at the VFD, and I think I upgraded to a better quality shielded video cable, so I then assumed the noise was leaking out as conducted (as opposed to radiated) interference on the VFD's power leads, although I haven't verified that with the digital storage oscilloscope. I installed some toroids as RF chokes on the incoming VFD power leads and it seemed to help a tiny bit. I almost never use that machine, so this problem wasn't high on my To Do list, but I'm building a 2'X2' CNC router for me (the larger machine was mostly for my brother), and I'd like to avoid replicating the problem on the second CNC router build. I just ordered a 14A Rasmi power line input filter on eBay for the VFD. It cost US$16 delivered. http://www.ebay.com/itm/290958532530 Hat tip to Andy for the recommendation. On 03/06/2015 12:43 PM, Andy Pugh wrote: > Almost certainly EMI. An input filter for the VFD can help. Check eBay > for "Rasmi" they are not expensive. ------------------------------------------------------------------------------ Dive into the World of Parallel Programming The Go Parallel Website, sponsored by Intel and developed in partnership with Slashdot Media, is your hub for all things parallel software development, from weekly thought leadership blogs to news, videos, case studies, tutorials and more. Take a look and join the conversation now. http://goparallel.sourceforge.net/ _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
