Dave - see comments inline.
> ------------------------------ > > Message: 2 > Date: Thu, 10 Dec 2015 15:28:03 -0500 > From: Dave Cole <[email protected]> > Subject: Re: [Emc-users] linuxcnc 2.7.3 - mesa 7i77 update > To: "Enhanced Machine Controller (EMC)" > <[email protected]> > Message-ID: <[email protected]> > Content-Type: text/plain; charset=windows-1252; format=flowed > > Cable shields are typically tied to frame/backplane ground. One end > only if you want to avoid ground loops. > The cable shield from your VFD to motor connection should also be tied > to frame/backplane ground. > I don't see a filter on the power feed to that GS2 VFD? Do you have > one? The Automation direct single phase one is about $80 and worth > every cent. > Dave - you are correct, I don't have a filter on the power feed to the GS2 VFD. I vaguely remember a discussion on this forum about the need for one and I do remember telling myself, "I don't need one, I don't have a noise problem." Hahahahahah... If only I knew... I can look to get one of the GS2 filters, I have put EMI filters on Servo Amp's (Emerson-EP) trying to fight noise issues on multiple RS-232 lines and in that example it didn't do much in that case. When possible, I tried to separate AC and DC voltages (230, 120, 80vdc, 24vdc, 15, and 5). I do have separate wire duct for power and lower voltage logic and then they cross at 90 degrees. I'm probably not perfect on the power separations, but I did try where possible. I can try moving the cables as well. Thanks, Mark > Move your drive to motor cable to the right side of the drive and don't > put it in that wire duct. Attach it to the side of the drive if you > need to attach it anywhere. > There is no requirement to have the 0V of your 5 or 24 volt supply tied > to frame/backplane ground. > I think that Automation Direct VFDs may also be sold as EMI generators. > They push noise back into the power feed very effectively and I have > seen that same noise go right through 5V and 24 volt power supplies and > screw things up. > I've fought that fight before and won. > > In general the panel looks nice. Not excessively crowded. > > Dave > > > ------------------------------------------------------------------------------ _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
