On Mon, 29 Mar 2010, Rudy du Preez wrote: > Date: Mon, 29 Mar 2010 09:22:41 +0200 > From: Rudy du Preez <r...@asmsa.co.za> > Reply-To: "Enhanced Machine Controller (EMC)" > <emc-users@lists.sourceforge.net> > To: emc-users@lists.sourceforge.net > Subject: Re: [Emc-users] Analogue servo driving with Mesa 7i33 > > I have managed pretty well converting 3 machines to EMC2 - two using the > parallel port and one using Mesa 5i20 and 7i29 cards. However, now I am > looking at using a 5i20+7i33 setup to drive analogue servo drivers that need > two inputs, AN+ and AN- 10V (and GND?). It is not clear to me how this is to > be done. > > The 7i33 card has one AOUTn pin for each of 4 channels (called AOUT0 to > AOUT4), and a lot of GND pins. How do I connect my servo driver to these > pins?. Should the voltage on the AOUTn pin swing from -10V to +10V?
Normally you would connect the AOUTn pin to your drives AN+ and the adjacent ground to your drives AN-. Drives are wired this way (the drives have a differential input) so that common mode noise is rejected. The voltage on the AOUTn pins swings from -10V to +10V > > The HAL configuration talks about PWM and PID, etc. With PWM you have PWM > and DIR signals and with PID you have UP and DOWN. Which of these are to be > used and what do they mean? I think PWM can be swung from -1 to +1 to create >> From -10V to +10V - how does DIR fit in. What does UP and DOWN do? (UP 0 to > 10V and down 0 to -10V?). Yes, you can also use the scale parameter if you wish the command to have a different range, for example if you set scale to 10, a PWMGEN command of -10 to +10 will generate a -10 to +10 voltage on the output. DIR is handled automatically by the driver For the 7I33 the optimum PWMGEN setting is PDM with 6 MHz rate (pwmgen output-type = 3 and pdm_frequency = 6000000 ) Not sure what you mean with PID, PID has no UP/DOWN pins HostMot2s PWMGEN has other output modes, for example the UP/DOWN mode. but the 7I33 hardware uses PWM/DIR or PDM/DIR modes only (output-mode 1 or 3) > > As you can see I am totally confused and need some expert advice. I think > the difficulty is the two separated interfaces: from EMC2 to Mesa 5i20 and > from Mesa 5i20 to 7i33. Hostmot2 deals with the first interface, the second > interface is not clear. I have problems with both interfaces. > > Thanks for any advice. > Rudy > > > __________ Information from ESET Smart Security, version of virus signature > database 4980 (20100328) __________ > > The message was checked by ESET Smart Security. > > http://www.eset.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 > Peter Wallace Mesa Electronics (\__/) (='.'=) This is Bunny. Copy and paste bunny into your (")_(") signature to help him gain world domination. ------------------------------------------------------------------------------ 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
