I have had very good luck with drive input filters sold by Automation Direct. On the box it says Delta Electronics Model 20DRT1W3S.
Here it is. http://www.automationdirect.com/adc/Shopping/Catalog/Drives/AC_Drive_%28VFD%29_Spare_Parts_-a-_Accessories/GS_EMI_-z-_RF_Filters/EMI_-z-_RF_Filters_%28All_GS_Drives%29/20DRT1W3S This is a single phase in/out filter I installed on some Teco servo drives that were scrambling the Mesa boards on an analog servo application in a panel quite a bit larger than yours. That black SO cord running from the top of the drive to the contactor (I think) is an excellent broadcast antenna that will induce voltages into other circuits. I mounted the filter just above the drive so I had short leads from the filter to the drive. All problems vanished. Can you run your motor leads in sealtite? Get the metallic variety of course. That should also work to shield your motor leads. Automation Direct also sells output chokes which will cut down on noise on the motor leads. Dave On 5/11/2015 9:00 PM, Tom Easterday wrote: > Early on we made a decision to put our VFD into the same cabinet as the rest > of the electronics on a lathe retrofit - I originally had two separate > cabinets, one for power with vfd and one for electronics. This was to save > space and bring the size of the cabinet on the machine down to a more > reasonable size so it might fit through doors, etc. In retrospect, perhaps > that was a bad idea. But here we are trying to address VFD induced noise > problems. The cabinet is shown in a picture here: > https://www.flickr.com/photos/37438950@N00/17219261571/in/album-72157651167328249/ > > <https://www.flickr.com/photos/37438950@N00/17219261571/in/album-72157651167328249/> > There is actually more wiring completed now then what is shown in the > picture but you get the idea. > > After having read about folks often using Rasmi input power filters to solve > noise issues I purchased one from ebay and installed it today. It didn’t > help, and may have actually made the problem worse. I installed it very > close to the VFD input power terminals as recommended. > > When I run the spindle motor on it’s lowest RPM I hear a high pitched whine > (at the motor) and strange things begin to happen in Axis. Windows pop up, > perhaps a homing window, perhaps a touch off, perhaps Axis switches to MDI > mode, sometimes it turns the machine off, sometimes it turns the machine off > but the spindle keeps moving! Sometimes the VFD shuts off and displays "oL > 1” on the screen. > > So now I want to understand how this noise is getting into the PC. I first > thought it was because the keyboard, mouse, and video cables ran past the VFD > in the cabinet and noise was being induced on the keyboard cable. So in > trying to isolate where the issue was I disconnected those cables and ran > them far away from the VFD. No help.. I then wondered if it was coming in > the AC power to the PC, so I rerouted the PC power to a completely different > outlet outside of the cabinet. No help. I then rerouted the network and > video cables to get those away from the VFD, no help again. Even with the > door open (as you see in the picture) I have noise. The only thing > connecting the PC to the rest of the system is the parallel cable which is > about 12” long that connects to the Mesa 7i85s card (and again, that is at > the other end of my cabinet from the VFD). Today I borrowed a friend’s > 0-1Ghz spectrum analyzer to see if I can find the source/frequency of the > noise and/or where it might be getting to the PC. I will start playing with > that tomorrow. > > I am wondering if anyone has any ideas of where i can look, or what I can do? > -Tom > > ------------------------------------------------------------------------------ > One dashboard for servers and applications across Physical-Virtual-Cloud > Widest out-of-the-box monitoring support with 50+ applications > Performance metrics, stats and reports that give you Actionable Insights > Deep dive visibility with transaction tracing using APM Insight. > http://ad.doubleclick.net/ddm/clk/290420510;117567292;y > _______________________________________________ > Emc-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-users --- This email has been checked for viruses by Avast antivirus software. http://www.avast.com ------------------------------------------------------------------------------ One dashboard for servers and applications across Physical-Virtual-Cloud Widest out-of-the-box monitoring support with 50+ applications Performance metrics, stats and reports that give you Actionable Insights Deep dive visibility with transaction tracing using APM Insight. http://ad.doubleclick.net/ddm/clk/290420510;117567292;y _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
