Input line filters are suggested for a lot of systems that might emit noise back into the power line. John
> -----Original Message----- > From: Mark Johnsen [mailto:m...@ijohnsen.com] > Sent: December-29-20 11:23 PM > To: Enhanced Machine Controller (EMC) > Subject: Re: [Emc-users] Chinese VFDs with good reputations > > Hey Gene, > > I would agree - output filters on a VFD would not be a good idea. I was > thinking of Input Line filters to the VFD. If I recall, the VFD can send > back noise on the input lines which can be picked up by other stuff, either > power supplies, computers, or I/O points and cause issues. > > Something like this: > https://www.automationdirect.com/adc/shopping/catalog/drives_-a- > _soft_starters/ac_variable_frequency_drives_(vfd)/vfd_accessories/roxburgh_3-phase_drive-rated_power_line_emi_-z- > _rf_filters/kmf306a > > > I could be confusing all this with something else, so take that advice with > a grain of salt. > > Mark > > > > On Tue, Dec 29, 2020 at 11:00 PM Gene Heskett <ghesk...@shentel.net> wrote: > > > > > > > > They don't like output filters at all, the capacitors in them can quickly > > kill the semi's doing the phase switching. Most will have warnings in > > their docs to make sure there is nothing between the output and the > > motors they are controlling. Inputs seem to be much less of a problem as > > I have a 250 volt Corcom that is a brick wall above 30 mhz in ones > > input, and had a home made gizmo of about those specs in the input to > > another for years. > > > > > > _______________________________________________ > 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
