Thanks, Alex. On Mon, Apr 12, 2010 at 3:50 PM, Alex Joni <alex.j...@robcon.ro> wrote: > Here's a nice difference between a normal relay estop setup and a safety > relay: > http://www.ia.omron.com/product/cautions/189/img/cn_2.gif > > Regards, > Alex > > > On 4/13/2010 1:47 AM, Alex Joni wrote: >> >> >> http://www.pilz.com/products/control_communication/safety_relay/index.en.jsp >> >> (first hit off google) >> >> Basicly they are a relay, with some aditional circuitry inside so that bad >> things can't happen. >> if you have a glitch in the safety circuit, the safety relay opens and >> stays that way until you reset it >> But there are various kinds, with various inputs/connection circuits. >> >> Regards, >> Alex >> >> >> On 4/13/2010 1:01 AM, Neil Baylis wrote: >>> >>> What's a safety relay? Is it a particular kind of relay? >>> >>> Neil >>> >>> On Mon, Apr 12, 2010 at 2:51 PM, Alex Joni<alex.j...@robcon.ro> wrote: >>>> >>>> Just use a safety relay for this, no need to reinvent the wheel.. >>>> >>>> Regards, >>>> Alex >>>> >>>> >>>> On 4/12/2010 10:10 PM, Neil Baylis wrote: >>>>> >>>>> OK, thanks. I guess they don't exist. >>>>> >>>>> I guess what I'll do is to add a circuit that requires the e-stop >>>>> button to be pressed before a fault condition can be cleared. Then I >>>>> have no choice but to twist the e-stop before resuming. >>>>> >>>>> Thanks, >>>>> >>>>> Neil >>>>> >>>>> >>>>> On Mon, Apr 12, 2010 at 11:32 AM, Jim Fleig - CNC Services >>>>> <j...@cncservices.ws> wrote: >>>>> >>>>>> Hi Neil, >>>>>> >>>>>> I believe Eric is correct. After 30 years in industry (the last 20 >>>>>> specifically with CNC) I have never seen what you are describing. As >>>>>> Eric >>>>>> mentioned, a relay that must be activated by a reset switch would do >>>>>> the >>>>>> job. Reset switches for this purpose I have seen and included in some >>>>>> of >>>>>> the retrofits that I have done. >>>>>> >>>>>> Have a good day, >>>>>> >>>>>> Jim >>>>>> >>>>>> >>>>>> ----- Original Message ----- >>>>>> From: "Eric Keller"<keller...@gmail.com> >>>>>> To: "Enhanced Machine Controller >>>>>> (EMC)"<emc-users@lists.sourceforge.net> >>>>>> Sent: Monday, April 12, 2010 2:01 PM >>>>>> Subject: Re: [Emc-users] Emergency Stop switch >>>>>> >>>>>> >>>>>> My guess is that a switch with an actuator in it would be so expensive >>>>>> that nobody has ever bothered to market one. I think your best bet is >>>>>> to have a self-powering relay that can only be turned on by a >>>>>> momentary switch. >>>>>> Eric >>>>>> >>>>>> On Mon, Apr 12, 2010 at 1:53 PM, Neil Baylis<neil.bay...@gmail.com> >>>>>> wrote: >>>>>> >>>>>>> Thanks Jim, >>>>>>> >>>>>>> I understand how to set up such a failsafe circuit. But in addition, >>>>>>> I >>>>>>> want the actual e-stop switch to activate and latch, so that >>>>>>> regardless of whether the computer generates a fault condition, or I >>>>>>> do it myself, I still have to manually release the switch before >>>>>>> resuming operation. >>>>>>> >>>>>>> >>>>>>> Neil >>>>>>> >>>>>>> On Mon, Apr 12, 2010 at 10:39 AM, Jim Fleig - CNC Services >>>>>>> <j...@cncservices.ws> wrote: >>>>>>> >>>>>>>> Hi Neil, >>>>>>>> >>>>>>>> Setup a failsafe circuit with the connection passing through the >>>>>>>> E-stop >>>>>>>> contacts energizing a relay. If anything in the series circuit >>>>>>>> becomes >>>>>>>> open >>>>>>>> (E-stop button, relay contacts in E-stop circuit, overtravel limit >>>>>>>> switch >>>>>>>> contacts, etc.) the functions dependant upon that circuit being >>>>>>>> closed >>>>>>>> stop >>>>>>>> functioning. >>>>>>>> >>>>>>>> Someone may have a schematic example to share. If not, email me and >>>>>>>> I >>>>>>>> will >>>>>>>> send you an example. >>>>>>>> >>>>>>>> Have a good day, >>>>>>>> >>>>>>>> Jim >>>>>>>> >>>>>>>> >>>>>>>> >>>>>>>> ----- Original Message ----- >>>>>>>> From: "Neil Baylis"<neil.bay...@gmail.com> >>>>>>>> To:<emc-users@lists.sourceforge.net> >>>>>>>> Sent: Monday, April 12, 2010 1:19 PM >>>>>>>> Subject: [Emc-users] Emergency Stop switch >>>>>>>> >>>>>>>> >>>>>>>> >>>>>>>>> I'm looking to source an e-stop switch. I have some already with >>>>>>>>> the >>>>>>>>> big red mushroom button that latches when you press it, and must be >>>>>>>>> turned to release. This is good. But what I want is a switch that >>>>>>>>> can >>>>>>>>> also be operated by a signal from the computer. So if the computer >>>>>>>>> detects an e-stop condition, the mushroom button would pop down, >>>>>>>>> just >>>>>>>>> as if I had pressed it by hand. I would drive it from a digital >>>>>>>>> out, >>>>>>>>> obviously. >>>>>>>>> >>>>>>>>> Does such a thing exist, and can anyone point me at a source? >>>>>>>>> >>>>>>>>> Thanks, >>>>>>>>> >>>>>>>>> Neil Baylis >>>> >>>> No virus found in this outgoing message. >>>> Checked by AVG - www.avg.com >>>> Version: 9.0.801 / Virus Database: 271.1.1/2807 - Release Date: 04/12/10 >>>> 21:32:00 >>>> >>>> >>>> ------------------------------------------------------------------------------ >>>> Download Intel® Parallel Studio Eval >>>> Try the new software tools for yourself. Speed compiling, find bugs >>>> proactively, and fine-tune applications for parallel performance. >>>> See why Intel Parallel Studio got high marks during beta. >>>> http://p.sf.net/sfu/intel-sw-dev >>>> _______________________________________________ >>>> Emc-users mailing list >>>> Emc-users@lists.sourceforge.net >>>> https://lists.sourceforge.net/lists/listinfo/emc-users >>>> >>>> >>> >>> >> >> >> No virus found in this outgoing message. >> Checked by AVG - www.avg.com >> Version: 9.0.801 / Virus Database: 271.1.1/2807 - Release Date: 04/12/10 >> 21:32:00 >> >> >> >> ------------------------------------------------------------------------------ >> Download Intel® Parallel Studio Eval >> Try the new software tools for yourself. Speed compiling, find bugs >> proactively, and fine-tune applications for parallel performance. >> See why Intel Parallel Studio got high marks during beta. >> http://p.sf.net/sfu/intel-sw-dev >> >> >> _______________________________________________ >> Emc-users mailing list >> Emc-users@lists.sourceforge.net >> https://lists.sourceforge.net/lists/listinfo/emc-users >> > > > No virus found in this outgoing message. > Checked by AVG - www.avg.com > Version: 9.0.801 / Virus Database: 271.1.1/2807 - Release Date: 04/12/10 > 21:32:00 > > ------------------------------------------------------------------------------ > Download Intel® Parallel Studio Eval > Try the new software tools for yourself. Speed compiling, find bugs > proactively, and fine-tune applications for parallel performance. > See why Intel Parallel Studio got high marks during beta. > http://p.sf.net/sfu/intel-sw-dev > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > >
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