Kirk Wallace wrote: > On Thu, 2008-06-12 at 19:22 -0400, Ed wrote: > >>Going throuogh the schematics for my CHNC the limit switches and the >>home switch have three terminals PLUS MINUS and ZERO. Are these voltage >>or polarity dependent or are they simple switches? > > > The limit and home switches should be Hall effect devices. They have > open collector outputs which short the output to ground when they are > activated. They should use a 12 Volt supply but are rated for 4.5 to 24 > Volts. The output voltage can be any voltage under the supply voltage. > Just make sure there is some sort of current limiting below 20 mA on the > output. The Z home and limit switches should be Honeywell 103SR's: > > http://content.honeywell.com/sensing/prodinfo/solidstate/catalog/c20014.pdf > > The X switches are very similar to these: > > http://www.cherrycorp.com/english/sensors/ds.htm
Mine are Microswitch brand Part No. 47XL21-03 and might get switched out for new. > > >> Also the turret >>encoder shows an A B C and D outputs. Are these binary or BCD and why 4 >>lines when 3 would be enough for 8 positions? > > > There are nine conditions to monitor (0 being between tool slots and > slot 1 through 8) so the fourth bit is needed. So is bit A always zero between or are all bits zero between positions? In other words is tool 1 represented by binary 01 and 2 10 and 3 11 and so forth? > > >>What voltage to this >>encoder? Probably more questions later as I dig into it. Thanks. Ed. > > > The encoder board is setup for a 12 Volt supply. My board has drivers on > the outputs instead of open collectors. This chip is similar to the pair > on the board: > > http://www.ti.com/lit/gpn/cd4532b > > I convert my 12 Volt signals to 5 Volt signals with opto-couplers. > ------------------------------------------------------------------------- Check out the new SourceForge.net Marketplace. It's the best place to buy or sell services for just about anything Open Source. http://sourceforge.net/services/buy/index.php _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
