pirmd., 2025. g. 7. jūl., plkst. 16:55 — lietotājs gene heskett (<ghesk...@shentel.net>) rakstīja: > > On 7/7/25 02:58, Viesturs Lācis wrote: > > Hello! > > > > I have a question if anyone from EU has a spare 8i20 drive (can be > > used as long as it works correctly) that I can purchase. It seems that > > I have to replace 3rd Yaskawa servodrive in my Biesse retrofit. > > Eusurplus are out of stock, I did not find any other sellers that have > > them and I really do not want to deal with customs bureaucracy. > > > > Viesturs > > Some Q's Viesturs: > > Is Yaskawa gone? > > and do you still have the failed units? > > What is the power supply voltage? > > Do you have an instrument that can measure both a capacitors capacity > and its ESR? > > And make basic checks on power transistors, including big VFET's? > > With that ESR instrument you can probably restore them by finding and > replacing the capacitors that have now aged out and failed, usually > effectively open. >
Yes, I not only still have the failed units, I still NEED them to provide proper encoder signal to LinuxCNC (I wrote about that last year or so - A and B channels from encoder are normal quadrature, but third channel has a pattern that, relative to A and B channels provide information about rotor's position, basically doing the same as Hall sensor signals). The problem with previous drives were error messages. The problem with this drive is that it is burning analog output channels on 7i48 board. It has been few hours at max of total time the machine has been turned on and enabled and I already have 3 analog outputs permanently stuck at 13-14 V (last of which happened today; I need 2 channels for C axis and for VFD, so only one spare analog channel left). I thought that it was something random after the first, got suspicious after second and now I am sure after the third. I have done multiple retrofits with older Yaskawa drives, this is the first time I see something like this. I have checked the wiring, I blame the servodrive. My most sophisticated tool for measuring electrical signals is digital oscilloscope. The other one is simple multimeter. Since I am not sure that I understand the suggestion about measuring ESR (and what that is) I should not get involved in attempts to repair. So I still would appreciate any offer to purchase 8i20 from somebody in EU to save my time on paperwork. Viesturs _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
