I have a few of these in operation. Procured from ebay. https://www.elmomc.com/product/tambourine-20/
Just one will drive 3x 1500 watt servos on a vmc. The one thing I had to add was a brake circuit for the 1500W servos. On Fri, Jun 21, 2024 at 8:51 AM andy pugh <bodge...@gmail.com> wrote: > On Fri, 21 Jun 2024 at 12:14, Viesturs Lācis <viesturs.la...@gmail.com> > wrote: > > > The question I am trying to solve at the moment is DC supply for 8i20 > > Both my lathe and mill use 8i20s on the main axes. > > In both cases I use a single power supply shared by all the drives on > the machine. > The supplies are a simple rectifier and capacitor except that I also > have resistors and relays for soft-start and capacitor discharge. > > Discharge is handled by a normally-closed relay that opens when the > PSU power is turned on. > > Soft start on the lathe is handled by a HAL component, as the 8i20 > returns bus voltage on smart-serial > If the 8i20 bus voltage is above a few volts I do not allow the PSU to > turn on. (to protect the relay contacts from welding) > Then, when the PSU turns on it is powered through a power resistor to > limit the surge. > Then when the HAL component sees something close to full bus voltage > it switches an output that closes a relay that bypasses the soft-start > resistor. > > The mill PSU has a 555 timer for soft start, and I like this less than > the HAL component as a solution, > > My system does not have any isolation between the DC power and mains, > it is just a simple rectifier/cap. > > If you add a 3-phase transformer you will have much less input ripple > and will also have some isolation. > If I could find a suitable transformer cheaply I would use one. > > -- > atp > "A motorcycle is a bicycle with a pandemonium attachment and is > designed for the especial use of mechanical geniuses, daredevils and > lunatics." > — George Fitch, Atlanta Constitution Newspaper, 1912 > > > _______________________________________________ > 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
