Okay guys, as of today my brand new motors and drives are ordered and on their way to me. I am pretty excited about this as I will be basically working with all brand new components on my VMC here and I get to choose how they are wired and run. YEAY!!!!
In regard to the limit and estop ciruit I wanted to get back to what Dave said from Machmotion. Basically the way he described it or at least how I understood it was like this. The e-stop circuit is a COMPLETE power down of the motion control part of the drives as well as the drives themselves. The limit switches were part of the computer estop circuit that disables the motor power side of the drives so that if you manage to hit a limit switch a hard limit switch all power to the motors is removed. Then with some machmotion control trickery you are able to temporarily repower the motor side of the drive so that you can then carefully jog off the switch and regain control. Understand that apparently the logic side of the drive controls the power to the encoder so even in an limit switch trip circumstance you are still not losing the machine's position. In an estop situation you still have the capability to completely remove the power to the drives so in case of a complete meltdown you are safe. I think this is the best way to work this and it essentially accomplishes all of what we need to be safe. The dual input voltage on the drives is a nice feature of the tecos as is the fact that the drives use a timed relay output built into the drive to control the brake on the z motor. That is another story I am curious about and I intend to wait for the documentation on my new motors to see how it is supposed to work. Lots of things to consider when planning a build like this. For instance today I found out that my plan to switch the control relays to using my 24v dc power supply is not entirely possible since all of the relays in my machine run entirely off 110vac.... that and the relay I had planned to use to control the spindle drive is not able to handle as much power in single phase mode as I plan to run the entire machine off single phase... always something...peace Pete On Tue, Feb 12, 2013 at 5:14 PM, andy pugh <[email protected]> wrote: > On 12 February 2013 21:56, Todd Zuercher > <[email protected]> wrote: > > > Why not just use the "normal" limit switch route through the control? > Linuxcnc didables the drive by removing the drive enable signal when a > limit switch is tripped. > > What if the runaway is due to LinuxCNC going crazy? > > -- > atp > If you can't fix it, you don't own it. > http://www.ifixit.com/Manifesto > > > ------------------------------------------------------------------------------ > Free Next-Gen Firewall Hardware Offer > Buy your Sophos next-gen firewall before the end March 2013 > and get the hardware for free! Learn more. > http://p.sf.net/sfu/sophos-d2d-feb > _______________________________________________ > Emc-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-users > ------------------------------------------------------------------------------ Free Next-Gen Firewall Hardware Offer Buy your Sophos next-gen firewall before the end March 2013 and get the hardware for free! Learn more. http://p.sf.net/sfu/sophos-d2d-feb _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
