I was going to start working on putting a tool touch probe on a machine with a Mesa 7i77 setup. (I was just going to try a wire clipped to the tool and a touch plate for a start.) I pulled out the multi-meter and started poking around to try to figure out what exactly I wanted to do and noticed something odd. I checked the V+ to ground and it read 0v and V- showed -12v. My field power is suppied by a simple 12v switching power supply (wall wart). I don't see any obvious place where the 12v power is referenced to ground (positive or negative.) Might this be normal? Would It cause a problem if I tried to connect the V- to ground (such as short out the 12v power supply)? Is this a symptom of another wiring problem somewhere (a short to ground hidden somewhere.) Which side should I use for the spindle/tool wire clamp the field power or the input pin? (the spindle does show a little resistance to ground) Should I put any resistors in line to help protect from short circuits? --
======================================== Todd Zuercher mailto:zuerc...@embarqmail.com ======================================== ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
