The VFD takes 0-10V, so the output min is set to 0 and max to 10. When testing in the PnCConf open loop test the scope confirms that the output voltage is correct for whatever I enter in the test box for DAC output i.e. 5 gives about 5V, 2 about 2V, etc. that all works fine. The current enable and direction outputs work correctly in the open loop test as well it just has the issue with the instant direction change during decel when stopping from a reverse run.
I'm thinking that switching to fwd and rev control instead of enable and dir will work around that problem. The 7i76 has fully isolated opto outputs provided for enable and direction, but the VFD doesn't need that since it's isolated and will take 24V signals from the regular field outputs just fine. The 7i76 dedicated enable and direction outputs can't be used for fwd / rev since the enable is hard linked to the analog output enable. The real issue is that I am unable to get any spindle operation at all in LinuxCNC no matter what settings I use, and even in PnCConf open loop test I can't get any operation if I have an encoder configured. I don't know the encoder CPR, I'd have to take it out of it's mount to read the info. I figured I'd just get the spindle running at a known speed and put a frequency counter on it to calculate CPR. Thanks, Pete C. ------Original Mail------ From: "David Armstrong" <cncbas...@gmail.com> To: "Enhanced Machine Controller (EMC)" <emc-users@lists.sourceforge.net> Sent: Thu, 18 Sep 2014 11:29:14 +0100 Subject: Re: [Emc-users] New to LinuxCNC and PnCConf and need some help... Pete, as far as i can see your hal file is fine , but the spindle values in your ini file should be along the lines of [SPINDLE_9] ENCODER_SCALE = 4000.0 OUTPUT_SCALE = 10.0 #OUTPUT_MIN_LIMIT = -10.0 #OUTPUT_MAX_LIMIT = 10.0 could you let me know how you have the spindle drive connected and using what terminals on your 7i76 . as the output terminals on the 7i76 are isolated you need to make one side of the opto to volts or ground dependant on how your vfd is operated your spindle encoder is connected on encoder channel 0 which is ENCA + ( pin 7 )and IDX +(pin 13) and using the 5vp (pin6) and gnd (pin 9) as the power for the encoder , as your using single ended TTL input here and not differential encoders , then you will need to move w4,w5,w6 to the non default position (up ). you dont say what the number of counts your encoder has but this would be the value of Encoder_scale in the above , so change accordingly Dave On 17 September 2014 22:58, andy pugh <bodge...@gmail.com> wrote: > On 17 September 2014 22:53, <p...@wpnet.us> wrote: > > > On the instant reverse issue I am wondering if instead of using the > fully isolated enable and direction outputs provided by the 7i76 if I would > be better off setting up for fwd/rev control and using two of the general > field outputs (I have plenty free) which should still be fine since the VFD > is isolated itself and it's inputs are optos. > > That is pretty much what I have (using a 7i43) so ought to work. PCW > might have an alternative scheme. > > -- > atp > If you can't fix it, you don't own it. > http://www.ifixit.com/Manifesto > > > ------------------------------------------------------------------------------ > Want excitement? > Manually upgrade your production database. > When you want reliability, choose Perforce > Perforce version control. Predictably reliable. > > http://pubads.g.doubleclick.net/gampad/clk?id=157508191&iu=/4140/ostg.clktrk > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > ------------------------------------------------------------------------------ Want excitement? Manually upgrade your production database. When you want reliability, choose Perforce Perforce version control. Predictably reliable. http://pubads.g.doubleclick.net/gampad/clk?id=157508191&iu=/4140/ostg.clktrk _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users ------------------------------------------------------------------------------ Want excitement? Manually upgrade your production database. When you want reliability, choose Perforce Perforce version control. Predictably reliable. http://pubads.g.doubleclick.net/gampad/clk?id=157508191&iu=/4140/ostg.clktrk _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
