I use estop type 4... http://wiki.linuxcnc.org/cgi-bin/wiki.pl?Sample_HAL_And_ClassicLadder
These examples use classic ladder - although I think there is a hal component that does something similar http://linuxcnc.org/docs/2.7/html/man/man9/estop_latch.9.html On Sun, Jul 21, 2019 at 7:35 AM Gene Heskett <ghesk...@shentel.net> wrote: > On Sunday 21 July 2019 07:08:52 andrew beck wrote: > > > Hi guys > > > > I have got my cnc mill control panel working ok now just have some > > questions about the best and proper way to implement the safety E stop > > circuit and initial power on of the cnc machine > > > > I did some searching of course, but thought I would ask here and see > > what the latest and best way is. searching on the forum, some of the > > info was a little dated. so if anyone has any advice I would most > > appreciate it. I saw on Youtube what samco(skunkworks) (I think his > > name is chris Radek) has done. And this is pretty much what I want i > > think. > > > > I think this should happen when the E stop is pushed. > > > > Cut control power to all servos and main spindle VFD. > > I am probably a poor one to advise since I have not a separate E-Stop > on any of my machines, depending on the f1 and f2 keys to do it all, > which also still leaves me subject who owns the keyboard focus. > > > (I think I may need to just send a E stop signal to the VFD as it > > doesn't have control power that I can cut.) It seems a big extreme to > > cut main power and possible damage the vfd with loose high voltages > > etc. > > I use the F1 key to enable power and this includes the vfd by way of the > usual 40 amp 400 volt SSR's which are easily controlled. The F2 key > enables motion. > > In this way you have an onscreen tally as the the machines state. > > > It should tell linuxcnc that the E stop is pushed. > > I need to set up a latching relay somehow to make sure the E stop > > doesn't turn back on until I turn it on within linuxcnc. > > > > Servo Power on setup. > > > > I want a Button I can push which enables all the servo drives( there > > is a Servo on pin on the servo drives) > This can be done in the .hal file by enableing the servo drives from the > status of the F1 key latch. > > and then also enable the vfd > Same here, fire the SSR's from the same signal. > > > > however I need to do that. This is separate to the E stop. Currently > > I am only using step and direction control and I am wondering how hard > > it will be to tie in the encoder signals to linux cnc with another > > mesa card. otherwise when i push the E stop I will have to re home > > the machine. > > I have not tried to do that, you will have lost your home if the power is > cut. I use steppers and with the drivers still enabled by F1, the stop > distance is rarely more than 1 count at working speed. But can if in a > rapid move at the time of the stop take several steps which the feeback > encoder will miss, so you should rehome. Servo's are another story, and > should return to the null point when re-enabled. > > Here, I consider the F2 key as an E-stop as it stops motion as fast as it > can, while leaving power on everything. > Leaving power on the servo's, it seems to me would give a faster stop > than killing power with its slow decay to zero. > > I don't think it would be too hard to rig a big red button to be the equ > of pressing the F2 key. I made progress on getting more spare inputs, > and am considering something like a doorbell button I can slap. But I > can't find such a button without a light bulb across the contacts. You > would have to cut the light bulb out and remove it, otherwise the switch > is closed forever to a bob input pin. One could supply that pin with > enough pullup power to light the bulb, but most doorbell are 24 volt > circuits, so an si diode would be needed to protect the bob's input. > > So I'm not "kosher" but unless lcnc doesn't have keyboard focus, it works > for me, and the diffs are minimal. I'd have a bigger problem figuring > out where to put the switch so its in a consistent location so muscle > memory could be depended on once you got used to it. > > Believe me, there is nothing more frustrating that recognizing the sound > of a 15 hp water pump thats suddenly single phased, and your hand is > headed to the off button, but is still 18" from it when the lights go > out because the 1200 amp/phase building breaker has tripped like a 12 > gauge, followed a few milliseconds later by the realization this fix is > going to need around $125,000 and at least two unscheduled quorums on > the state legislature called. One to authorize the purchase, and when > its been built and ready to ship, write the check. > > Yeah, broadcast power klystrons are that expensive. Thats why we don't > use them anymore. > > > anyway please sing out with any feedback you have and > > ideas. I would love to get some ideas here from those who have done > > this all before. > > > > I am using a mesa 5i25 7i76 combo. > > Good combo, I'm using it twice myself. > > > And I have all sorts of contactors etc. > > > > Regards > > > > Andrew > > > > <https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_ > >campaign=sig-email&utm_content=webmail> Virus-free. > > www.avast.com > > <https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_ > >campaign=sig-email&utm_content=webmail> > > <#DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2> > > > > _______________________________________________ > > Emc-users mailing list > > Emc-users@lists.sourceforge.net > > https://lists.sourceforge.net/lists/listinfo/emc-users > > > Cheers, Gene Heskett > -- > "There are four boxes to be used in defense of liberty: > soap, ballot, jury, and ammo. Please use in that order." > -Ed Howdershelt (Author) > If we desire respect for the law, we must first make the law respectable. > - Louis D. Brandeis > Genes Web page <http://geneslinuxbox.net:6309/gene> > > > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
