Layered, independent systems make sense. Yes, control/positioning will be relative to the "work' though it won't be work un the usual sense. Sorry to be so obtuse.
One engineering firm estimated the first one would cost around $5M. That's probably 1/3 to 1/4 of the total project budget. Definitely venture capital territory. Before I can go there, I have several things to validate in the prototype and maybe a 1/4 scale commercial pilot. Long ways to go but with luck and perseverance I may make it eventually if it proves to be the better mousetrap. > On Aug 23, 2017, at 9:33 AM, Chris Albertson <[email protected]> > wrote: > > Yes, you absolutely need that, not implementing something like that would a > liability issue. Systems like this need an integrated E-stop they is > trigged independently of the motion controller. I'm imagine a layered > system where the controller can issue a "stop" or the operator or some > sensors or as a last resort a bumper presses a microswitch with cuts power > to the motors. Like a few switches in parallel and if any one of them get > tripped the power is cut to the relays that connect power to the motor and > the motor lead short putting the motor in "brake mode" This would also > have the effect of stopping the motors after a power failure. Using energy > in the motors coils to brake motion. > > None of this is rocket science. Hire an engineer with experience in > factory automation. Or just skim through some text books > > Half of the design of such a system, is self monitoring. You need a design > that remains safe even after a component failure. Some times it is easy, > like using normally open relays so power is disconnected if control signal > sops. > > We are talking about a system that will cost many millions of dollars and > will need a full time engineering staff to design and build. > > On Wed, Aug 23, 2017 at 9:19 AM, Rick Gresham <[email protected]> > wrote: > >> The building will likely typical concrete tilt-up or something similar. >> The system will have to track/control position in real time. Collisions >> will be very expensive so redundant systems are easily justified. It may >> need some sort of collision avoidance system as a back up, too. If the >> crosses some boundary, everything stops. Stoppages are not a big problem, >> bumps in the dark are. >> >> I've wondered about redundant control systems but haven't come across any >> information yet. Anyone remember the triple Tandem non-stop systems NASA >> used? Three fault-tolerant systems running in parallel. If they came up >> with different results, it was odd-man-out. Probably don't need to go >> that far for this application unless something available off the shelf >> affordably. >> >>> On Aug 23, 2017, at 8:56 AM, Chris Albertson <[email protected]> >> wrote: >>> >>> There are many ways to measure position. With something this big and >>> expensive I would suggest some redundan ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
