There is nothing wrong with what you are doing. However after you install the drive filter you may find that your issues simply go away.
A single point ground setup makes it almost impossible to have significant ground loops. Connect the shields only at one end, preferably the panel end where the single point ground lives. Those grounding blocks/strips that they sell for power panels at Home Depot, Lowes, Menards work fine. GE, Square D, Siemens, etc all sell them. Dave On 12/25/2015 6:42 PM, John Thornton wrote: > The filter is 115/250v so it could go on the upstream side of the > control transformer. I'm not understanding the ground part. I thought > all grounds go to a common point? Drawing tomorrow... > > JT > > On 12/25/2015 5:05 PM, Bertho Stultiens wrote: >> On 12/25/2015 11:51 PM, John Thornton wrote: >> [snip] >>> So from the distribution blocks the >>> 240v goes to the VFD filter and the control transformer. I have a second >>> filter for the 120v side, should that go just after the control transformer? >> Could you make a (quick and dirty) drawing? >> >> The mains filter should normally be on the primary side, not the >> secondary. A mains filter is to prevent injection back into the grid. >> >> If I understand you correctly, you want to do following: >> >> >> [240V mains]--+--[vfd filter]--[VFD controller]--[spindle] >> | >> +--[mains filter]--[ctl transformer]--[control] >> >> The interesting part in now how earth is connected in the "VFD >> controller" and the "control". If the GND of both are connected to earth >> (internally), then you will create a loop and all hell may break loose. >> > > ------------------------------------------------------------------------------ > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users ------------------------------------------------------------------------------ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
