On Sat, 15 Oct 2011, Tom Easterday wrote: > Date: Sat, 15 Oct 2011 19:58:44 -0400 > From: Tom Easterday <tom-...@bgp.nu> > Reply-To: "Enhanced Machine Controller (EMC)" > <emc-users@lists.sourceforge.net> > To: "Enhanced Machine Controller (EMC)" <emc-users@lists.sourceforge.net> > Cc: "Enhanced Machine Controller (EMC)" <emc-users@lists.sourceforge.net> > Subject: Re: [Emc-users] config without encoders > > > > On Oct 15, 2011, at 7:29 PM, "Peter C. Wallace" <p...@mesanet.com> wrote: > >> On Sat, 15 Oct 2011, Tom Easterday wrote: >> >>> Date: Sat, 15 Oct 2011 15:28:19 -0400 >>> From: Tom Easterday <tom-...@bgp.nu> >>> Reply-To: "Enhanced Machine Controller (EMC)" >>> <emc-users@lists.sourceforge.net> >>> To: "Enhanced Machine Controller (EMC)" <emc-users@lists.sourceforge.net> >>> Subject: Re: [Emc-users] config without encoders >>> >>> >>> On Oct 15, 2011, at 12:48 PM, Dave wrote: >>> >>>> Tom, >>>> >>>> I'm running a couple of stepgens via a 5i20 card on one machine and it >>>> is running much faster than what you are and I am not seeing overshoot >>>> problems. >>>> >>>> I suspect your Max_accel below is lower than the accel values you have >>>> set in the INI file so you are telling the stepgen to go faster than >>>> what you have limited it to below. >>>> >>>> Try entering some large values below directly for max accel and max >>>> velocity and see if your problem doesn't go away. That way the stepgen >>>> will not attempt to limit the velocity of accel. >>>> >>> >>> The values below just reference the ini. For max accel and max vel the ini >>> values are: >>> >>> MAX_VELOCITY = 39 >>> MAX_ACCELERATION = 120 >>> >>> Though we have also tried much lower values like 80 and 50 for acceleration. >>> >>> -Tom >>> >>>> Dave >> >> >> Whats is the stepgen max velocity set for? This needs the 10% overhead >> abouve your actual maximum speed > > I don't think we have stepgen max velocity set. I do think we have stepgen > max accel set to a number at least 10% above max accel. Is this the 10% you > are referring to in your last message? Or was it for steplen and stepspace? > > Tom
I would check carefully that you do not have something, likely a velocity or steplen/stepspace setting that limits the maximum stepgen speed. at your scale and speed you have a fairly slow step rate (82 KHz) which is less than 1% of the step generators maximum speed (12.5 MHz) so the ghardware is not the limiting factor, some setup option must be set incorrectly > > ------------------------------------------------------------------------------ > All the data continuously generated in your IT infrastructure contains a > definitive record of customers, application performance, security > threats, fraudulent activity and more. Splunk takes this data and makes > sense of it. Business sense. IT sense. Common sense. > http://p.sf.net/sfu/splunk-d2d-oct > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > Peter Wallace Mesa Electronics (\__/) (='.'=) This is Bunny. Copy and paste bunny into your (")_(") signature to help him gain world domination. ------------------------------------------------------------------------------ All the data continuously generated in your IT infrastructure contains a definitive record of customers, application performance, security threats, fraudulent activity and more. Splunk takes this data and makes sense of it. Business sense. IT sense. Common sense. http://p.sf.net/sfu/splunk-d2d-oct _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
