On Saturday 04 March 2017 16:24:29 Jon Elson wrote: > On 03/04/2017 12:20 PM, Ben Potter wrote: > > Thanks all, > > > > I'll swap the X drive onto the Z motor in the morning and do that > > test. > > > > The drive is a Bosch Z15-1A-240 - which is a thyristor drive. I'll > > pull the output pack and see if I can find any identifying marks on > > the thyristors. > > Thyristor? Really? I didn't know they put these on > Bridgeports. (I've seen them on very old Fanuc controls, > before 1982, I think.) > > You may have real problems finding replacements for them. > > Jon > I think they may be still around, at places like graveyard electronics and such. Just hearing the word took me back a bit, primarily because while intended to be bi-lateral, handling the fwd phase and the reverse all in one package that the differences in trigger sensitivity were never fully understood by the driver designers. Eventually they would get so lop sided that the dc average that represented would saturate the iron in the inductances, leading to just such a blowup. I don't know that Jon's Pico Systems pwmservo driver at 20 amps and 160 volts is a match for those motors, but if they are, those are certainly great drivers. And even bolted to a heat sink, they are probably 15% of the cubic volume of the thyristor driver. I am using 2 of them, driving 1hp brushed motors as spindle motors.. They Just Work(tm). I had to make power supplies of coarse, big ugly kilowatt plus, 30 lb analog hogs.
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) Genes Web page <http://geneslinuxbox.net:6309/gene> ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, SlashDot.org! http://sdm.link/slashdot _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
