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 > > -- http://www.pixpopuli.com ------------------------------------------------------------------------------ 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
