A break in one of the wires would cause it be on two phases, vibrate and not run. Definitely intermittent as it flexes. A piece of cable is so cheap compared to another VFD. Just strap another cable onto the cable chain and run it for a few hours. If it doesn't fail, it's not conclusive, but if it does, then you know for certain it's the VFD.
Cables that flex are a consumable, unless it's very high quality Lapp cable or other. Roland On Fri, 17 Mar 2023 at 02:50, Leonardo Marsaglia <ldmarsag...@gmail.com> wrote: > Hi Gene, > > Well, it's a little tricky because of the amount of cables I have running > next to the ones of the spindle. But I checked the integrity of the cable > and by visual inspection it all looks alright. It's a 3 wire cable with the > black insulating cover so it's pretty well protected. > > I really doubt the cable is the problem from what I've experienced and from > the condition of the cable in general. > > El jue., 16 de marzo de 2023 16:52, gene heskett <ghesk...@shentel.net> > escribió: > > > On 3/16/23 12:44, Leonardo Marsaglia wrote: > > > I've checked that the terminals are connected well but I didn't check > for > > > the entire cable to be alright. > > > > > > I thought about it but I really didn't think such an intermittent > failure > > > could be caused by the cable alone. Do you recommend to install a new > > cable > > > just in case? > > > > > That depends on how old that cable is, and how much flexing it has > > endured in its time. And in some instances, what color the plastic used > > for insulation is. Magenta, aka hot red or hot pink, contains a chemical > > I can't name but it destroys the copper in the wire by converting it to > > a fine, rust colored powder that may, or may not, properly conduct > > electricity. That color is most often found in two-way radio microphone > > cords as the connection to the tx button, or today, more commonly as the > > outer jacket of a sata drive cable in your computers. In either case, > > the failure rate by the time its 5 years old, is well up the far end of > > the well known bathtub curve. I long ago changed all of mine out for any > > color but hot red/aka magenta. End of drive errors. > > > > I have serious doubts that is the problem in this case, since the > > currents involved are definitely capable of starting a noticeable fire. > > But a hand, run along the length of the cable, looking for hot spots > > when the failure is in evidence might not be a bad idea. Or better yet, > > tracing the wire with an IR thermometer or infra-red camera. > > > > > El jue., 16 de marzo de 2023 13:37, Todd Zuercher < > to...@pgrahamdunn.com > > > > > > escribió: > > > > > >> Have you checked your cabling between the motor and VFD? > > > > And please folks, take a break on the mail server, and trim your posts > > down to the context of your reply. > > Cheers, Gene Heskett. > > -- > > "There are four boxes to be used in defense of liberty: > > soap, ballot, jury, and ammo. Please use in that order." > > -Ed Howdershelt (Author, 1940) > > If we desire respect for the law, we must first make the law respectable. > > - Louis D. Brandeis > > Genes Web page <http://geneslinuxbox.net:6309/> > > > > > > > > _______________________________________________ > > 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 > _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
