I checked and from Pheonix any sort of gold flash isn't available. They are on 6mm spacing and although installed as a 12 position I can cut and remove only the 6 on the LHS. But what to replace them with?
John > -----Original Message----- > From: Peter Blodow [mailto:p.blo...@dreki.de] > Sent: April-06-20 12:43 PM > To: emc-users@lists.sourceforge.net > Subject: Re: [Emc-users] Gecko Failure > > Gentlemen, > tin happens to stand near to the transition metals in the periodic > system and thus tends to slowly turn from metallic (conductive) to > crystaline (noc-conductive) as time goes on. At room temperature this > takes very long, say 10 years or more, at low temperature faster, > especially below -20 or -30 degrees Celsius. I had such a problem with > my refrigerator where the temperature sensor or its plug developed high > resistance, freezing all the contents to -10 degrees over night. A > temporary means to fix this is to waggle the connectors from time to > time. Napoleons soldiers in Russia in 1812 had tin buttons on their > uniform trousers and jackets which turned into crumbs in siberian > winter, a great problem for the great emperor. > > Always chose galvanized golden pins and connectors! > > Peter > > > > Am 06.04.2020 um 18:43 schrieb Peter C. Wallace: > > On Mon, 6 Apr 2020, Jon Elson wrote: > > > >> Date: Mon, 06 Apr 2020 11:27:23 -0500 > >> From: Jon Elson <el...@pico-systems.com> > >> Reply-To: "Enhanced Machine Controller (EMC)" > >> <emc-users@lists.sourceforge.net> > >> To: "Enhanced Machine Controller (EMC)" > >> <emc-users@lists.sourceforge.net> > >> Subject: Re: [Emc-users] Gecko Failure > >> > >> On 04/05/2020 11:24 PM, John Dammeyer wrote: > >>> Anyone ever run into this sort of thing with a G213V driver? > >>> http://www.autoartisans.com/mill/G213V-Failure.jpg > >>> > >>> It was running the Knee with a 1200 oz-in motor and 60VDC power supply. > >>> > >>> > >> Typical result of a high-resistance connection getting hot. And, > >> almost everybody in the industrial connector business makes these > >> "Euro-style" connectors, so I'm sure for cost reasons Gecko does > >> NOT use Phoenix Contact parts, but a Chinese equivalent. > >> > >> It may also be that transistors in the Gecko failed and it put full > >> DC supply voltage on the motor winding > >> until fuses or whatever blew. > >> > >> Jon > >> > > > > > > Yeah, its unusual for the drive power connections to fail since they > > typically have low average current. Its much more common for the motor > > connections to fail > > > > The general problem with Tin connectors is that they have a positive > > feedback failure mechanism if used anywhere near their current > > limits,� their contact resistance rises over time and heat exposure > > and the higher the resistance, > > the high the temperature and the faster this degradation progresses... > > > > Peter Wallace > > Mesa Electronics > > > > > > _______________________________________________ > > Emc-users mailing list > > Emc-users@lists.sourceforge.net > > https://lists.sourceforge.net/lists/listinfo/emc-users > > > > > Am 06.04.2020 um 18:43 schrieb Peter C. Wallace: > > On Mon, 6 Apr 2020, Jon Elson wrote: > > > >> Date: Mon, 06 Apr 2020 11:27:23 -0500 > >> From: Jon Elson <el...@pico-systems.com> > >> Reply-To: "Enhanced Machine Controller (EMC)" > >> ��� <emc-users@lists.sourceforge.net> > >> To: "Enhanced Machine Controller (EMC)" > >> <emc-users@lists.sourceforge.net> > >> Subject: Re: [Emc-users] Gecko Failure > >> > >> On 04/05/2020 11:24 PM, John Dammeyer wrote: > >>> Anyone ever run into this sort of thing with a G213V driver? > >>> http://www.autoartisans.com/mill/G213V-Failure.jpg > >>> > >>> It was running the Knee with a 1200 oz-in motor and 60VDC power supply. > >>> > >>> > >> Typical result of a high-resistance connection getting hot. And, > >> almost everybody in the industrial connector business makes these > >> "Euro-style" connectors, so I'm sure for cost reasons Gecko does > >> NOT use Phoenix Contact parts, but a Chinese equivalent. > >> > >> It may also be that transistors in the Gecko failed and it put full > >> DC supply voltage on the motor winding > >> until fuses or whatever blew. > >> > >> Jon > >> > > > > > > Yeah, its unusual for the drive power connections to fail since they > > typically have low average current. Its much more common for the motor > > connections to fail > > > > The general problem with Tin connectors is that they have a positive > > feedback failure mechanism if used anywhere near their current > > limits,� their contact resistance rises over time and heat exposure > > and the higher the resistance, > > the high the temperature and the faster this degradation progresses... > > > > Peter Wallace > > Mesa Electronics > > > > > > _______________________________________________ > > 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
