On Mon, 6 May 2013, Marius Liebenberg wrote: > Date: Mon, 06 May 2013 07:14:34 +0200 > From: Marius Liebenberg <[email protected]> > Reply-To: "Enhanced Machine Controller (EMC)" > <[email protected]> > To: "Enhanced Machine Controller (EMC)" <[email protected]> > Subject: Re: [Emc-users] Creep in X axis > > >> Are the drives AC servos so the encoder signals are in fact coming >> from the drives, not the encoder? >> > There is an encoder on the motor that is connected to the drive. The > feedback is then given by the drive. > >> If this is the case, is it possible tha the X axis drive is either >> faulty or improperly setup as regards encoder outputs? > I have swapped out the drive with one of the working axis. I also > swapped out the 7i33. There are two in the system and I swapped them > over. The error stayed with the x axis. > > >> >> Are you using differential signaling from the drive/encoder to the 7I33? > > Yes > >> >> If so, is the 7I33 setup for differential inputs >> > Yes > >> is the error affected by velocity? (same error if you move at 1/2 the >> speed?) that is, is it possible you are running into a count rate >> limitation somewhere? >> > There is a huge downward gearing on the x axis and we move very slowly > as the workpiece can be very heavy. It could be a problem that I will > have to check out. Why in one direction though? > > >> what is the encoder/drive simulated encoder resolution (counts per MM) >> and maximum X velocity? >> > I am guessing here a bit as I am nit close to the machine at this time. > The encoder scale is 3500 and max velocity is around 20000 mm/min >
Hmm.. this is beginning to look more like a mechanical problem Can you mark the motor shaft and check the marks relative position to the motor case before and after a long move? > > -- > Regards / Groete > > Marius D. Liebenberg > MasterCut cc > Cel: +27 82 698 3251 > Tel: +27 12 743 6064 > Fax: +27 86 551 8029 > Skype: marius_d.liebenberg > Skype Me^(TM)! <skype:marius_d.liebenberg?call> > Get Skype <http://www.skype.com/go/download> and call me for free. > > > > > --- > avast! Antivirus: Outbound message clean. > Virus Database (VPS): 130505-1, 2013/05/05 > Tested on: 2013/05/06 07:14:36 AM > avast! - copyright (c) 1988-2013 AVAST Software. > http://www.avast.com > > > ------------------------------------------------------------------------------ > Introducing AppDynamics Lite, a free troubleshooting tool for Java/.NET > Get 100% visibility into your production application - at no cost. > Code-level diagnostics for performance bottlenecks with <2% overhead > Download for free and get started troubleshooting in minutes. > http://p.sf.net/sfu/appdyn_d2d_ap1 > _______________________________________________ > Emc-users mailing list > [email protected] > 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. ------------------------------------------------------------------------------ Introducing AppDynamics Lite, a free troubleshooting tool for Java/.NET Get 100% visibility into your production application - at no cost. Code-level diagnostics for performance bottlenecks with <2% overhead Download for free and get started troubleshooting in minutes. http://p.sf.net/sfu/appdyn_d2d_ap1 _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
