Martin Pinkston wrote: > ...snip > > Andy, the 26 pin header pin out sheet is wrong. the Centroid guy saw a > picture I took and told me I had a different board than what he initially > thought should have been in this unit. > Let me see if I can take a picture of the pin out schematic and post it on > my blog. www.212steam.blogspot.com > ...smip Martin are you sure you only have 4 wires going to each motor. The new pin out on your blog suggests that you should have 6 or 8 wires with possibly 2 or 4 of them going to ground and the four you mentioned being driven by transistors. These being the four phases for each motor. This pin out also implies that the step and direction are handled by the cpu and it is separately developing the phase signals in appropriate order to turn the proper direction. I guess it is possible for each winding to have one end tied to ground or power supply at the motor. Can you check the resistance of a winding to ground? Otherwise I don't understand 4 phases for each motor with only 4 wires unless they are really two phases with their complements. Does anybody else have an explanation for 4 phases with only 4 wires? The drawing also implies that all of the driver cards receive the identical signals and possibly some jumpers or switches are used to select which ones are used for the particular card. If you do have another connection to the windings you have not located yet it would explain the performance you are getting as the resistance would be halved. The fact that you are only raising lowering the quill by steppers also explains why you can get by with the same size for Z. Martin I just looked at some driver schematics using transistors. It showed the power supply feeding through the motor to the transistor. Do you have separate wires running from the power supply to each motor as well as the 4 wires that connect to the driver card. If so what is the resistance from the power cable to each of the phase wires?
Hubert > > I was able to get a couple pics of the pin out header so they will be on my > blog in just a couple of minutes. > > thanks again guys, I really do admire your knowledge with this stuff. > ( more than willing to trade some steam engine and machining know how > on *neruon > card* for some knowledge on this stuff on *neuron card.* > > Martin > ------------------------------------------------------------------------------ > Return on Information: > Google Enterprise Search pays you back > Get the facts. > http://p.sf.net/sfu/google-dev2dev > _______________________________________________ > Emc-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-users > ------------------------------------------------------------------------------ Return on Information: Google Enterprise Search pays you back Get the facts. http://p.sf.net/sfu/google-dev2dev _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
