On Tue, 2008-04-15 at 20:42 -0700, Kirk Wallace wrote: ... snip > The drives have four inputs that appear > to take in steps as quadrature signals plus their complements; QB, > QA, /QB, /QA. > > QB ___|```|___|```|_ > QA _|```|___|```|___ > /QB ```|___|```|___|` > /QA `|___|```|___|```
I scoped out the driver IO and got this: QB ___|```|___|```|_ QA _|```|___|```|___ /QB ```|___|```|___|` /QA `|___|```|___|``` IB __||__||__||__||_ IA ||__||__||__||__| The IA and IB sink the LED's on two optocoupler inputs each. The high side of the LED's is driven by the Q and /Q quadrature signals. I am guessing this forms a NAND function or an Inhibit? I wonder if the inhibits are needed to prevent shoot-through? If that is the case I will need to be very careful not to allow shoot-through. Here are some pictures of one of the drives. http://www.wallacecompany.com/machine_shop/Shizuoka/00001-1a.jpg http://www.wallacecompany.com/machine_shop/Shizuoka/00002-1a.jpg I am wondering if this is just a simple H-bridge with current limit? If anyone has more information on this drive, I would appreciate hearing it. -- Kirk Wallace (California, USA http://www.wallacecompany.com/machine_shop/ Hardinge HNC lathe, Bridgeport mill conversion, doing XY now, Zubal lathe conversion pending Craftsman AA 109 restoration Shizuoka ST-N/Bandit CNC) ------------------------------------------------------------------------- This SF.net email is sponsored by the 2008 JavaOne(SM) Conference Don't miss this year's exciting event. There's still time to save $100. Use priority code J8TL2D2. http://ad.doubleclick.net/clk;198757673;13503038;p?http://java.sun.com/javaone _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
