You can get a cable tracer and ring it as well. Lock out the VFD and you don't even have to disconnect anything if you can reach in and get clips on the UVW wires. A break in the insulation will show up as a bright spot and a break in the conductors will be marked by a sharp drop off.
If that is what happened, I'd recommend getting a high quality _drag_ cable for future. They'll be marked TRVVP *Ryan McIntosh* E4F Designs (204)770-3682 r...@pebkac.ca On Sat, Mar 18, 2023 at 7:22 AM Roland Jollivet <roland.jolli...@gmail.com> wrote: > 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 > _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
