On Wednesday 30 December 2020 02:23:18 Mark Johnsen wrote: > 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.
Yes it can but input filters are generally acceptable, even recommended at times. > 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 cannot see this link as its a Long link broken by word wrap, allways surround long links with <long-link> arrows which protects them from word wrapping damage in most link parsers. > 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. Cheers, Gene Heskett, CET (Certified Electronics Technician, says I should know about such stuff) But my Cert is from 1972, so it is also old, like me. But at 86, I am still trying to teach. Hence the post. :) Take care and stay well folks. -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) If we desire respect for the law, we must first make the law respectable. - Louis D. Brandeis Genes Web page <http://geneslinuxbox.net:6309/gene> _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
