Hey I had a yaskawa drive go bad and the encoder output from the drive to linuxcnc computer died.
Encoder from motor was still fine. So jogging worked etc in drive. I was about to swap it out and it would have been a major hassle. But I thought I would just try one of peters ency cards It's a encoder splitter that takes in one channel and makes 2 out. I wired that in directly from the yaskawa encoder on the motor and then actually just spliced the encoder feedback from motor back to yaskawa drive and then the extra channel to linuxcnc. That was 2 years ago. It's still getting used all the time perfectly happy. I was stoked The ency cards are like 20usd too. Hopefully this helps On Wed, 20 Nov 2024, 06:22 Viesturs Lācis, <viesturs.la...@gmail.com> wrote: > Hello! > > First thing is that there is Commander CD750 VFD for the spindle motor > that I have (almost) under control with 2 output pins on 7i37 board > and an analog output of 7i36 board. The thing is that I do not > understand why is the analog output voltage fluctuating. I did a short > video here: > https://www.youtube.com/shorts/no8-CHsCggc > > What I have there is pwmgen scale set to 100 and value at 30 so that > should be 3V on the analog output. There is slightly more. With pwmgen > value equal to 0 I still have 0.3V so I would gladly fix that offset > but have no idea how. But the main problem is the fluctuation because > then VFD also is adjusting the motor speed. For demonstration purposes > I did turn the spindle on and it can be heard easily that motor speed > is not steady. Those numbers on VFD are output frequency as an > additional indication that input voltage is fluctuating. > > I would appreciate any ideas where to look further. > > > > The second question is about Yaskawa encoders and decoding rotor > position from C channel pulses as described here: > > https://forum.linuxcnc.org/27-driver-boards/53321-yaskawa-incremental-encoder-and-mesa-7i48?start=0#305997 > > Is it possible to implement it? So far I have been circumventing it by > keeping the old drives in the cabinet for treating the encoder signal > and export "standard" ABZ signal for LinuxCNC, but now the thing is > that I have a first case of the encoder signal output being unreadible > any more. > > Viesturs > > > _______________________________________________ > 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
