Re: [Emc-users] 3-phase pwmgens for 7i39
2011/9/28 Sebastian Kuzminsky s...@highlab.com: On Sep 28, 2011, at 13:19 , Peter C. Wallace wrote: On Wed, 28 Sep 2011, Viesturs L?cis wrote: But with this I receive error, in which I find this line to be most important: [ 4776.024432] hm2/hm2_7i43.0: invalid token in config string: num_3pwmgens=3 So how exactly should that config modparameter look like for 7i43 to What version EMC, not sure if 2.46 has the 3 phase pwm support in the driver 3-phase pwm is not in 2.4 . It is in 2.5 and master. Thank You, Peter and Sebastian! Of course, I tried latest _released_ version. Ok, I will get buildbot package and try again! Viesturs -- 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-d2dcopy1 ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] calibrating stepper motor cnc
2011/9/29 Martin Patton mart...@gmail.com: The part looked right but the caliper says every dimension cut a little small. What is the range of deviances? What I mean, how consistent is the deviance in dimensions? Is it very close in all directions, is the error along one of the joints or is it completely random? I think that each of these cases will lead to different potential causes of the problem. Is there a good post on calibrating for a stepper motor machine? I think that cause of problem should be eliminated rather than trying to adjust g-code to it. Even more - if You do not know the cause, You will not be able to treat it in g-code anyway, because You need to know, what should be adjusted to workaround those deviances in dimensions. I think that first thing for stepper machine to try is playing with acceleration and velocity parameters. And next thing is actually testing the machine and understand those deviances - is there particular direction, where they occur etc. Viesturs -- 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-d2dcopy1 ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Omron V1000 VFD Modbus
not specific to the Omron VFD: - Some Modbus clients like the GS2 permit reading multiple registers (aka 'coils') in one read transactions. The Toshiba I worked with only supports single-register reads which required some restructuring and keeping an eye on roundtrip time if multiple registers are involved in the inner loop. - to make sense of the documentation and explore the device, I wrote a utility to interactively explore/control the VFD - it might help you too: http://git.mah.priv.at/gitweb/modio.git -m Am 24.09.2011 um 09:14 schrieb Viesturs Lācis: Hello, gentlemen! I would like to ask, if anyone could share their experience with Omron V1000 VFD. More specifically, I am interested in getting the drive communicating with EMC through Modbus. Is there anything specific to know or to avoid? Thanks in advance! Viesturs -- All of the data generated in your IT infrastructure is seriously valuable. Why? It contains a definitive record of application performance, security threats, fraudulent activity, and more. Splunk takes this data and makes sense of it. IT sense. And common sense. http://p.sf.net/sfu/splunk-d2dcopy2 ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users -- 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-d2dcopy1 ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] 3-phase pwmgens for 7i39
Ok, now EMC starts up and seems to be fine. I have one more question: Which of the pins should I connect pid.n.output to? There are 3 value pins, one for each phase: hm2_7i43.0.3pwmgen.00.A-value hm2_7i43.0.3pwmgen.00.B-value hm2_7i43.0.3pwmgen.00.C-value How is it supposed to be done? Pid output connected to A-value and leave the remaining 2 unconnected to anything? Thanks! Viesturs -- 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-d2dcopy1 ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] 3-phase pwmgens for 7i39
look at the BLDC component. PID goes to BLDC goes to 3 phase pwm Not that I have done it :) When you get this config going i would like to see the sample HAL file for PNCconf reference I might add to pay attention to PWM base frequency value and BLDC dead time. Both can do bad things to your 7i39 apparently. I'm sure Peter or Andy will chime in and give you specifics Chris M From: viesturs.la...@gmail.com Date: Thu, 29 Sep 2011 09:59:55 +0300 To: emc-users@lists.sourceforge.net Subject: Re: [Emc-users] 3-phase pwmgens for 7i39 Ok, now EMC starts up and seems to be fine. I have one more question: Which of the pins should I connect pid.n.output to? There are 3 value pins, one for each phase: hm2_7i43.0.3pwmgen.00.A-value hm2_7i43.0.3pwmgen.00.B-value hm2_7i43.0.3pwmgen.00.C-value How is it supposed to be done? Pid output connected to A-value and leave the remaining 2 unconnected to anything? Thanks! Viesturs -- 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-d2dcopy1 ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users -- 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-d2dcopy1 ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] calibrating stepper motor cnc
Martin; For what it's worth - I'm playing with a new machine of mine (Sieg KX1 with Gecko G540) and am looking at the backlash in the x-y table. To do this, I put a dial indicator on an axis; move +1mm, +1mm, +1mm, all show accurate moves; move +1mm +1mm -1mm shows the backlash. What if you did the same? At least it would show if you can move each axis as you expect. From a newbie; JohnS. -- 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-d2dcopy1 ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Need help with servo tuning
Bruce: I don't know how the system appears to be behaving, but your error of 20 - 30 um on the trace looks about as good as you'll get with those scales. That's within 2-3 encoder counts of commanded position. The problems I guess I was hoping would go away is the dithering or oscillation when the machine is at rest. With a P=.1 the axis drifts, at P=1 it seems to hold steady but the PID error is terrible. P=11 the PID error is the smallest I can get, P=13 the oscillation about tears the machine apart. Adjusting anything else I can get the PID error tiny amounts better but the oscillation never seems to get better I would also like to get rid of the jerking it sometimes does when moving. It did not do this with the old controller Here are some halscope images of the dithering and jerking: https://sites.google.com/site/bmklawt/home/pid-tuning His encoder is BOUND to have a lot of positional quantization noise, as it is a 100 um resolution linear scale, which is equal to roughly .0004. .This is the typical DRO-grade scale I just assumed with these scales I could machine a part to within .0004, and that would be perfect, I may try some better encoders. Didn't Anilam also use velocity tachs too Yes the servos use velocity Before changing .INI values using HalScope Calibration, I recommend modeling your system first. In other words understand where you are closing your current, velocity, and position loops. My PPMC system uses Yaskawa servo amps which close the current and velocity loop, leaving EMC2 to close the position loop (only P and FF1 are non-zero in INI). This is known as a P/PI w/FF cascade control because its loops are nested. Well this does seem to make some sense to me, I did tune the servos to Anilams specs following this procedure, turning pots and checking resistance at points https://sites.google.com/site/bmklawt/home/westamp-manual-tuning But the last thing it says to do is adjust the SIG pot to stop the servo from drifting, I could not get it to completely stop. There is more in depth tuning but it uses an oscilloscope and I don’t have one nor would I even know how to use it. Adjusting D doesn’t do much. Jon has said this may be as good as it gets, I'll have to cut some parts and see what it can do. Thanks all for the information. My build https://sites.google.com/site/bmklawt/home -- 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-d2dcopy1 ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] 3-phase pwmgens for 7i39
2011/9/29 andy pugh bodge...@gmail.com: Insufficient coffee error, redo from start. No, not correct at all. I would start with qh,qh,qh (Using i inmplies that you know where the index is relative to the poles.) Ok, got it! Thank You! One more question: Is it ok to route Hall signal in the same cable with encoder signal? Or are they going to disturb each other? Viesturs -- 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-d2dcopy1 ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Need help with servo tuning
On 29 September 2011 13:23, Bruce Klawiter bmkl...@yahoo.com wrote: are some halscope images of the dithering and jerking: https://sites.google.com/site/bmklawt/home/pid-tuning A single-count deadband in the PID might help. I am not sure if this is a good idea, but I wonder if a low-pass filter on the encoder position would help? -- atp Torque wrenches are for the obedience of fools and the guidance of wise men -- 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-d2dcopy1 ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] 3-phase pwmgens for 7i39
On 29 September 2011 13:30, Viesturs Lācis viesturs.la...@gmail.com wrote: Is it ok to route Hall signal in the same cable with encoder signal? Or are they going to disturb each other? It should be OK, otherwise you would be concerned about the A-encoder interfering with the B-encoder. -- atp Torque wrenches are for the obedience of fools and the guidance of wise men -- 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-d2dcopy1 ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] calibrating stepper motor cnc
One recommendation is to put a Vee cutter in your spindle and run a program where the Vee bit just touches the material in a uniform grid pattern. Take your part and measure all the positions from the 0,0. You may have your machine set up in such a manner that it is not just perfect. When I did this, I ended up adjusting the ini file slightly to correct for a 1/8 undershot over my 4' X axis and 1/16 on my 2' Y axis. On Thu, Sep 29, 2011 at 1:10 AM, Martin Patton mart...@gmail.com wrote: Hi EMC users, I have EMC running on an old pc, latency number about 25000. I got an occasional real time error with latency number set at 22000. I drew a part in CamBam, generated some g-code and cut a part. The part looked right but the caliper says every dimension cut a little small. A circle pocket drawn 1.50 diameter cut about 1.42 in diameter, The tool diameter matched the tool specified in the cad program. Is there a good post on calibrating for a stepper motor machine? Thanks, Marty -- 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-d2dcopy1 ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users -- 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-d2dcopy1 ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] 3-phase pwmgens for 7i39
2011/9/29 andy pugh bodge...@gmail.com: On 29 September 2011 13:30, Viesturs Lācis viesturs.la...@gmail.com wrote: Is it ok to route Hall signal in the same cable with encoder signal? Or are they going to disturb each other? It should be OK, otherwise you would be concerned about the A-encoder interfering with the B-encoder. Thank You! Few more questions about servo motor wiring. Motor datasheet has this information about wires: 1 Red Vcc supply voltage for Hall sensors 2 Blue HALL A 3 GreenHALL B 4 White HALL C 5 Black GND for Hall sensors 6 Yellow PHASE A 7 Red PHASE B 8 Black PHASE C 1) Should I connect Hall supply voltage to +5V encoder supply voltage (and Hall GND to encoder GND)? 2) If so, what should I do about motor GND connectors on 7i39 motor connection terminal block? Do I need to wire the motor case to them? Viesturs -- 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-d2dcopy1 ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] 3-phase pwmgens for 7i39
On Thu, 29 Sep 2011, Chris Morley wrote: Date: Thu, 29 Sep 2011 07:19:51 + From: Chris Morley chrisinnana...@hotmail.com Reply-To: Enhanced Machine Controller (EMC) emc-users@lists.sourceforge.net To: EMC emc-users@lists.sourceforge.net Subject: Re: [Emc-users] 3-phase pwmgens for 7i39 look at the BLDC component. PID goes to BLDC goes to 3 phase pwm Not that I have done it :) When you get this config going i would like to see the sample HAL file for PNCconf reference I might add to pay attention to PWM base frequency value and BLDC dead time. Both can do bad things to your 7i39 apparently. I'm sure Peter or Andy will chime in and give you specifics Chris M The 7I39 needs no dead time (its handled on the card) any PWM rate up to 50 KHz is OK with the 7I39 but 20-30 KHz is suggested since its too high to hear but not so high that switching losses become serious Peter Wallace Mesa Electronics -- 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-d2dcopy1 ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] 3-phase pwmgens for 7i39
On Thu, 29 Sep 2011, Viesturs L?cis wrote: Date: Thu, 29 Sep 2011 16:47:16 +0300 From: [UTF-8] Viesturs L?cis viesturs.la...@gmail.com 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] 3-phase pwmgens for 7i39 2011/9/29 andy pugh bodge...@gmail.com: On 29 September 2011 13:30, Viesturs L??cis viesturs.la...@gmail.com wrote: Is it ok to route Hall signal in the same cable with encoder signal? Or are they going to disturb each other? It should be OK, otherwise you would be concerned about the A-encoder interfering with the B-encoder. Thank You! Few more questions about servo motor wiring. Motor datasheet has this information about wires: 1 Red Vcc supply voltage for Hall sensors 2 Blue HALL A 3 GreenHALL B 4 White HALL C 5 Black GND for Hall sensors 6 Yellow PHASE A 7 Red PHASE B 8 Black PHASE C 1) Should I connect Hall supply voltage to +5V encoder supply voltage (and Hall GND to encoder GND)? Yes thats fine 2) If so, what should I do about motor GND connectors on 7i39 motor connection terminal block? Do I need to wire the motor case to them? Normally I would wire the motor frame ground to this point. Be advised This is motor V- meaning the motor power supply must be floating Viesturs -- 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-d2dcopy1 ___ 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-d2dcopy1___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] 3-phase pwmgens for 7i39
2011/9/29 Peter C. Wallace p...@mesanet.com: On Thu, 29 Sep 2011, Viesturs L?cis wrote: 2) If so, what should I do about motor GND connectors on 7i39 motor connection terminal block? Do I need to wire the motor case to them? Normally I would wire the motor frame ground to this point. Be advised This is motor V- meaning the motor power supply must be floating Thank You! What do You mean by floating power supply? Motor power supply consists of: 1) transformer with ~19 VAC on output; 2) rectifier bridge; 3) 22000uF capacitor. I have 2 such power supplies - one for each 7i39. Outputs of both power supplies _are not_ connected together and they _are not_ connected to PC PSU, which supplies +5V. Is that OK? Viesturs -- 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-d2dcopy1 ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] 3-phase pwmgens for 7i39
On Thu, 29 Sep 2011, Viesturs L?cis wrote: Date: Thu, 29 Sep 2011 17:20:15 +0300 From: [UTF-8] Viesturs L?cis viesturs.la...@gmail.com 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] 3-phase pwmgens for 7i39 2011/9/29 Peter C. Wallace p...@mesanet.com: On Thu, 29 Sep 2011, Viesturs L?cis wrote: 2) If so, what should I do about motor GND connectors on 7i39 motor connection terminal block? Do I need to wire the motor case to them? Normally I would wire the motor frame ground to this point. Be advised This is motor V- meaning the motor power supply must be floating Thank You! What do You mean by floating power supply? Motor power supply consists of: 1) transformer with ~19 VAC on output; 2) rectifier bridge; 3) 22000uF capacitor. I have 2 such power supplies - one for each 7i39. Outputs of both power supplies _are not_ connected together and they _are not_ connected to PC PSU, which supplies +5V. Is that OK? Yep, fine Viesturs -- 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-d2dcopy1 ___ 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-d2dcopy1 ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] CPR or PPR what are they
On Wed, 2011-09-28 at 15:28 -0700, Cliff Blackburn wrote: On 9/28/2011 2:55 PM, Bruce Klawiter wrote: I was looking at this encoder, http://www.usdigital.com/products/e2#description It says: Tracks from 0 to 100,000 cycles/sec 32 to 1250 cycles per revolution (CPR) 128 to 5000 pulses per revolution (PPR) I don't understand the difference between CPR and PPR, I am thinking it has something to do with the A and B channel being 90 degrees out of phase. If that is the case why is the PPR 4 time higher and not only twice as high. You can monitor the rising and falling edges of both a and b channels giving you 4 times the resolution. Also does any one have a recommendation for an encoder, what is a good reliable brand, what CPR or PPR should I get. The high the line count the better I would assume. I think the rule of thumb is to make sure you have at least 10 times more counts than the smallest resolution you want to maintain. More never hurts, but if you have too many the frequency at rapid speed is going to be high causing noise and monitoring issues. The rule I've heard is counts 5X better than the position accuracy you want to maintain. This came from a Boeing engineer. Velocity control is another matter and there more is probably better; it takes an awful lot of counts to overflow the counter in a few servo cycles. Time stamping may relieve some of the constraints. I have had good luck with dynapar encoders, there not cheap tho. I've been using the Koyo encoders that are just dust sealed which means one should go to some trouble to install them in housing that protects from all the nasties around a milling machine. Their price is about $90 from Automation Direct. I use the 2500 cpr differential ones. :-) Dave Read about my conversion here: https://sites.google.com/site/bmklawt/home Regards, Bruce -- 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-d2dcopy1 ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users -- 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-d2dcopy1 ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] calibrating stepper motor cnc
Hi Marty, As other people pointed out, it might be better not to jump to conclusions the cause of the error may not be stepper calibration. How long have you been using CamBam and what do you think of it? Martin Date: Thu, 29 Sep 2011 01:10:10 -0400 From: marty To: emc-users@lists.sourceforge.net Subject: [Emc-users] calibrating stepper motor cnc Hi EMC users, I have EMC running on an old pc, latency number about 25000. I got an occasional real time error with latency number set at 22000. I drew a part in CamBam, generated some g-code and cut a part. The part looked right but the caliper says every dimension cut a little small. A circle pocket drawn 1.50 diameter cut about 1.42 in diameter, The tool diameter matched the tool specified in the cad program. Is there a good post on calibrating for a stepper motor machine? Thanks, Marty -- 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-d2dcopy1 ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users -- 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-d2dcopy1 ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] calibrating stepper motor cnc
Martin Patton wrote: Hi EMC users, I have EMC running on an old pc, latency number about 25000. I got an occasional real time error with latency number set at 22000. I drew a part in CamBam, generated some g-code and cut a part. The part looked right but the caliper says every dimension cut a little small. A circle pocket drawn 1.50 diameter cut about 1.42 in diameter, The tool diameter matched the tool specified in the cad program. Is there a good post on calibrating for a stepper motor machine? First, you need to measure the actual movements with some kind of measuring tool, even if it is just using a dial caliper. You need to separate linear movement error, backlash and tool deflection. Without separating these different error mechanisms, you will not make the right correction. Linear error is pretty easy, put a pin in the spindle and measure between it and a block fixed to the table. If you move in the same direction, backlash will not alter the reading. Moving a number of inches so as to use nearly the full range of the caliper will give the most informative result. Then, approach the same coordinate from both directions and measure position. This may be harder to do with a caliper, as hopefully your backlash is relatively small. It is best to do this with a tenth-reading dial test indicator, if you have or can borrow one. Backlash alone could cause the error you report above. It will also leave 4 steps in the walls of a circular pocket, at those places where the axis needs to reverse, but takes a moment before the linear motion picks up on the other side of the backlash. If your problem is backlash, these steps should be really obvious on the part you mention above. Finally, it could be tool deflection, which will cause milled pockets to come out small. (Your measurement above seems to big to be tool deflection, however.) But, tool deflection will NOT leave bumps in the wall like backlash. Jon -- 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-d2dcopy1 ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] calibrating stepper motor cnc
On 29 September 2011 06:10, Martin Patton mart...@gmail.com wrote: A circle pocket drawn 1.50 diameter cut about 1.42 in diameter, 1.5 / 1.42 = 1.0563 2mm / 12tpi = 1.0583 Just a thought, do you have metric leadscrews calibrated in TPI? -- atp Torque wrenches are for the obedience of fools and the guidance of wise men -- 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-d2dcopy1 ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Need help with servo tuning
Bruce Klawiter wrote: The problems I guess I was hoping would go away is the dithering or oscillation when the machine is at rest. Yes, this is the universal problem with servos. There is no way for the dithering to be less than one encoder count. So, in your case, the resolution is ~ .0004, and so it will bounce back and forth that amount. You can try to suppress it with some deadband, but that is cutting into your accuracy with such a coarse scale. With a P=.1 the axis drifts, at P=1 it seems to hold steady but the PID error is terrible. P=11 the PID error is the smallest I can get, P=13 the oscillation about tears the machine apart. Well, I'd try some more with the D term, and see if it helps any. Adjusting anything else I can get the PID error tiny amounts better but the oscillation never seems to get better I would also like to get rid of the jerking it sometimes does when moving. It did not do this with the old controller Here are some halscope images of the dithering and jerking: https://sites.google.com/site/bmklawt/home/pid-tuning First picture shows error jumping +1 / -1 encoder count, exactly as expected from the 10 milli -mm encoder resolution. Frequency about 2 Hz. Second picture shows spikes. Have you run a long-term test to see if the axis is creeping in position? I am thinking these may be electrical noise getting into the encoder signals and causing erroneous counts to be detected. At such low resolution (means a single count = a lot of movement) then a singe extra count could seriously upset the servo loop. Calibrate the axis to a dial indicator, then run the axis back and forth a while, and then re-check the calibration to the indicator. If it has crept even a few counts worth, then that is likely the situation. If the encoder has differential output, have you set the PPMC encoder jumpers for differential? Otherwise, have you run the commtest option of the ppmcdiags program for a while to make sure the communication between PC and PPMC is good? Adjusting D doesn’t do much. Well, it OUGHT to do something. But, the way EMC's PID works, too much D can cause oscillations, as well. So, there is a valley where it helps the most, and either side it can cause instability. Jon -- 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-d2dcopy1 ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Need help with servo tuning
andy pugh wrote: A single-count deadband in the PID might help. I am not sure if this is a good idea, but I wonder if a low-pass filter on the encoder position would help? This was discussed some time ago, the real problem is a low-pass filter must cause delay, and that is bad in a servo loop. A better way is to do velocity estimation based on time stamping arrival of the encoder pulses. Unfortunately, the interface that Bruce has doesn't have this feature. The coarser the encoder resolution, the more jumpy the velocity computed from sample-sample difference has to be. He does have 1.5 counts worth of deadband in the PID already, but that equals .015 mm or .0006, so he can't make it much bigger. Jon -- 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-d2dcopy1 ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] 3-phase pwmgens for 7i39
2011/9/29 andy pugh bodge...@gmail.com: On 29 September 2011 11:03, Viesturs Lācis viesturs.la...@gmail.com wrote: What is max number of the pattern? 47, I think. See man bldc To me it seems that Your suggested hi,hi,hi is telling - there is Hall sensor feedback and index signal, no quadrature. Is that correct? Insufficient coffee error, redo from start. No, not correct at all. I would start with qh,qh,qh (Using i inmplies that you know where the index is relative to the poles.) I tried all 48 patterns twice. Obtained result - nothing... I tested by setting pattern value in HAL file, saving file, starting EMC and pressing F1 and F2. I understand that at this moment motor should turn. Is that correct? Here is the contents of HAL file that relates to that particular instance of encoder, bldc module and 3pwmgen. loadrt bldc cfg=qh,qh,qh addf bldc.2 servo-thread newsig emcmot.02.enable bit sets emcmot.02.enable FALSE net emcmot.02.enable = hm2_[HOSTMOT2](BOARD).0.3pwmgen.02.enable net emcmot.02.enable = axis.2.amp-enable-out # encoder feedback setp hm2_[HOSTMOT2](BOARD).0.encoder.02.counter-mode 0 setp hm2_[HOSTMOT2](BOARD).0.encoder.02.filter 1 setp hm2_[HOSTMOT2](BOARD).0.encoder.02.index-invert 0 setp hm2_[HOSTMOT2](BOARD).0.encoder.02.index-mask 0 setp hm2_[HOSTMOT2](BOARD).0.encoder.02.index-mask-invert 0 setp hm2_[HOSTMOT2](BOARD).0.encoder.02.scale [AXIS_2]INPUT_SCALE setp bldc.2.scale [AXIS_2]INPUT_SCALE setp bldc.2.poles 8 setp bldc.2.pattern47 net motor.2.hall-1 hm2_[HOSTMOT2](BOARD).0.gpio.027.in = bldc.2.hall1 net motor.2.hall-2 hm2_[HOSTMOT2](BOARD).0.gpio.028.in = bldc.2.hall2 net motor.2.hall-3 hm2_[HOSTMOT2](BOARD).0.gpio.029.in = bldc.2.hall3 net enc.2.raw hm2_[HOSTMOT2](BOARD).0.encoder.02.rawcounts = bldc.2.rawcounts setp hm2_[HOSTMOT2](BOARD).0.3pwmgen.02.scale 166.667 setp bldc.2.value 10 net pwm.02-a bldc.2.A-value = hm2_[HOSTMOT2](BOARD).0.3pwmgen.02.A-value net pwm.02-b bldc.2.B-value = hm2_[HOSTMOT2](BOARD).0.3pwmgen.02.B-value net pwm.02-c bldc.2.C-value = hm2_[HOSTMOT2](BOARD).0.3pwmgen.02.C-value 7i39 does receive power. It has 28.2VDC on motor power input terminals. Encoder is working - when I turn motor by hand, joint's position changes and bldc.2.rawcounts also changes. Hall sensor feedback also is recieved - when I watch bldc.2.hall1, bldc.2.hall2 and bldc.2.hall3 pins in HAL Config, all 3 LEDs change colors as I turn motor by hand. What else am I missing? -- 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-d2dcopy1 ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Need help with servo tuning
Are the velocity tachs still active, so that the drives are closing a velocity loop, and EMC2 is commanding that velocity loop on the basis of position error? If that is the case, I wonder if EMC2 would work with only I and FF1? (And if you think that you have a puzzle, I am currently calibrating a controller where the P gain is the product of two 10x10 maps (effectively a 10x10x10x10 lookup on total error, engine speed, oil temperature and command value), the I term is the product of three maps, the D term is the product of 2 maps with a time constant from another 2 maps and the PI limit and D limit are also the products of multiple maps. So I have 1100 PID terms to get right, including getting the engine into the right states to test them.) -- atp Torque wrenches are for the obedience of fools and the guidance of wise men -- 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-d2dcopy1 ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] 3-phase pwmgens for 7i39
On Thu, 29 Sep 2011, Viesturs L?cis wrote: Date: Thu, 29 Sep 2011 19:56:45 +0300 From: [UTF-8] Viesturs L?cis viesturs.la...@gmail.com 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] 3-phase pwmgens for 7i39 2011/9/29 andy pugh bodge...@gmail.com: On 29 September 2011 11:03, Viesturs L??cis viesturs.la...@gmail.com wrote: What is max number of the pattern? 47, I think. See man bldc To me it seems that Your suggested hi,hi,hi is telling - there is Hall sensor feedback and index signal, no quadrature. Is that correct? Insufficient coffee error, redo from start. No, not correct at all. I would start with qh,qh,qh (Using i inmplies that you know where the index is relative to the poles.) I tried all 48 patterns twice. Obtained result - nothing... I tested by setting pattern value in HAL file, saving file, starting EMC and pressing F1 and F2. I understand that at this moment motor should turn. Is that correct? Did you ever get any motor movement? If not, something more basic is wrong (like PWM enable or initial voltage % (you have 10/166.6*28V) = 1.7V -deadzone which may be too low to generate much current especially if the PWM frequency is high) Also I dont see the PWM frequency set Here is the contents of HAL file that relates to that particular instance of encoder, bldc module and 3pwmgen. loadrt bldc cfg=qh,qh,qh addf bldc.2 servo-thread newsig emcmot.02.enable bit sets emcmot.02.enable FALSE net emcmot.02.enable = hm2_[HOSTMOT2](BOARD).0.3pwmgen.02.enable net emcmot.02.enable = axis.2.amp-enable-out # encoder feedback setp hm2_[HOSTMOT2](BOARD).0.encoder.02.counter-mode 0 setp hm2_[HOSTMOT2](BOARD).0.encoder.02.filter 1 setp hm2_[HOSTMOT2](BOARD).0.encoder.02.index-invert 0 setp hm2_[HOSTMOT2](BOARD).0.encoder.02.index-mask 0 setp hm2_[HOSTMOT2](BOARD).0.encoder.02.index-mask-invert 0 setp hm2_[HOSTMOT2](BOARD).0.encoder.02.scale [AXIS_2]INPUT_SCALE setp bldc.2.scale [AXIS_2]INPUT_SCALE setp bldc.2.poles 8 setp bldc.2.pattern47 net motor.2.hall-1 hm2_[HOSTMOT2](BOARD).0.gpio.027.in = bldc.2.hall1 net motor.2.hall-2 hm2_[HOSTMOT2](BOARD).0.gpio.028.in = bldc.2.hall2 net motor.2.hall-3 hm2_[HOSTMOT2](BOARD).0.gpio.029.in = bldc.2.hall3 net enc.2.raw hm2_[HOSTMOT2](BOARD).0.encoder.02.rawcounts = bldc.2.rawcounts setp hm2_[HOSTMOT2](BOARD).0.3pwmgen.02.scale 166.667 setp bldc.2.value 10 net pwm.02-a bldc.2.A-value = hm2_[HOSTMOT2](BOARD).0.3pwmgen.02.A-value net pwm.02-b bldc.2.B-value = hm2_[HOSTMOT2](BOARD).0.3pwmgen.02.B-value net pwm.02-c bldc.2.C-value = hm2_[HOSTMOT2](BOARD).0.3pwmgen.02.C-value 7i39 does receive power. It has 28.2VDC on motor power input terminals. Encoder is working - when I turn motor by hand, joint's position changes and bldc.2.rawcounts also changes. Hall sensor feedback also is recieved - when I watch bldc.2.hall1, bldc.2.hall2 and bldc.2.hall3 pins in HAL Config, all 3 LEDs change colors as I turn motor by hand. What else am I missing? -- 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-d2dcopy1 ___ 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-d2dcopy1___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] 3-phase pwmgens for 7i39
On 29 September 2011 17:56, Viesturs Lācis viesturs.la...@gmail.com wrote: I tried all 48 patterns twice. Obtained result - nothing… As Pete says, if it is really nothing, then it isn't the pattern. The wrong pattern will make the motor lock or oscillate. I tested by setting pattern value in HAL file, saving file, starting EMC and pressing F1 and F2. I understand that at this moment motor should turn. Is that correct? That's a very long-winded way to do it. You can type setp bldc.0.pattern N in the Machine-ShowHalConfig window without having to restart EMC2. Personally I do all this sort of thing in the terminal with Halrun because you get tab-completion. (ie, type a bit of a pin-name, press tab, it fills in all that it can) I think the problem might be that you are not driving the 7i39 /ENABLE pins? (probably on gpio 026). That probably requires that those pins be set to outputs too. -- atp Torque wrenches are for the obedience of fools and the guidance of wise men -- 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-d2dcopy1 ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] 3-phase pwmgens for 7i39
2011/9/29 Peter C. Wallace p...@mesanet.com: Did you ever get any motor movement? No, I haven't. If not, something more basic is wrong (like PWM enable or initial voltage % (you have 10/166.6*28V) = 1.7V -deadzone which may be too low to generate much current especially if the PWM frequency is high) I changed bldc.2.value from 10 to 50 and still the same. Also I dont see the PWM frequency set HALConfig shows that value of pin hm2_7i43.0.3pwmgen.frequency is 2 I will try Andy's suggestion now. Viesturs -- 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-d2dcopy1 ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] 3-phase pwmgens for 7i39
2011/9/29 andy pugh bodge...@gmail.com: On 29 September 2011 17:56, Viesturs Lācis viesturs.la...@gmail.com wrote: That's a very long-winded way to do it. You can type setp bldc.0.pattern N in the Machine-ShowHalConfig window without having to restart EMC2. Thanks for the suggestion, will try that! Restarting EMC each time really makes it time-consuming. I think the problem might be that you are not driving the 7i39 /ENABLE pins? (probably on gpio 026). That probably requires that those pins be set to outputs too. Those pins are Enable pins in firmware, so they are not available as GPIO pins. According to .PIN file, I need to change gpio.032 pin. EMC is showing error, that hm2_7i43.0.gpio.032.is_output pin does not exist, which proves that it is reserved by firmware. Peter, can You explain, at which moment are those 7i39 enable pins set true? Viesturs -- 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-d2dcopy1 ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] 3-phase pwmgens for 7i39
On 29 September 2011 19:11, Viesturs Lācis viesturs.la...@gmail.com wrote: Those pins are Enable pins in firmware, so they are not available as GPIO pins. According to .PIN file, I need to change gpio.032 pin. EMC is showing error, that hm2_7i43.0.gpio.032.is_output pin does not exist, which proves that it is reserved by firmware. There is a .enable pin for each 3pwmgen too. -- atp Torque wrenches are for the obedience of fools and the guidance of wise men -- 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-d2dcopy1 ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] 3-phase pwmgens for 7i39
2011/9/29 andy pugh bodge...@gmail.com: On 29 September 2011 19:11, Viesturs Lācis viesturs.la...@gmail.com wrote: Those pins are Enable pins in firmware, so they are not available as GPIO pins. According to .PIN file, I need to change gpio.032 pin. EMC is showing error, that hm2_7i43.0.gpio.032.is_output pin does not exist, which proves that it is reserved by firmware. There is a .enable pin for each 3pwmgen too. But then this line should do the magic: net emcmot.02.enable = hm2_[HOSTMOT2](BOARD).0.3pwmgen.02.enable Viesturs -- 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-d2dcopy1 ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] 3-phase pwmgens for 7i39
On Thu, 29 Sep 2011, Viesturs L?cis wrote: Date: Thu, 29 Sep 2011 21:29:42 +0300 From: [UTF-8] Viesturs L?cis viesturs.la...@gmail.com 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] 3-phase pwmgens for 7i39 2011/9/29 andy pugh bodge...@gmail.com: On 29 September 2011 19:11, Viesturs L??cis viesturs.la...@gmail.com wrote: Those pins are Enable pins in firmware, so they are not available as GPIO pins. According to .PIN file, I need to change gpio.032 pin. EMC is showing error, that hm2_7i43.0.gpio.032.is_output pin does not exist, which proves that it is reserved by firmware. There is a .enable pin for each 3pwmgen too. But then this line should do the magic: net emcmot.02.enable = hm2_[HOSTMOT2](BOARD).0.3pwmgen.02.enable Viesturs HALmeter the 3PPWM fault signal, if its high, you may need to invert the external fault input signal(or tie that pin to the inactive state) -- 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-d2dcopy1 ___ 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-d2dcopy1___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] 3-phase pwmgens for 7i39
2011/9/29 Peter C. Wallace p...@mesanet.com: HALmeter the 3PPWM fault signal, if its high, you may need to invert the external fault input signal(or tie that pin to the inactive state) Thanks! Fault is true. I'm sorry, but I do not really understand, how exactly can I fix that. Viesturs -- 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-d2dcopy1 ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] 3-phase pwmgens for 7i39
On 29 September 2011 20:15, Viesturs Lācis viesturs.la...@gmail.com wrote: Fault is true. I'm sorry, but I do not really understand, how exactly can I fix that. There is a parameter .3pwmgen.N.fault-invert -- atp Torque wrenches are for the obedience of fools and the guidance of wise men -- 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-d2dcopy1 ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] 3-phase pwmgens for 7i39
2011/9/29 andy pugh bodge...@gmail.com: On 29 September 2011 20:15, Viesturs Lācis viesturs.la...@gmail.com wrote: Fault is true. I'm sorry, but I do not really understand, how exactly can I fix that. There is a parameter .3pwmgen.N.fault-invert Thank You! Now the motor is oscillating. I checked all 47 patterns twice, none of them is rotating motor smoothly. During testing I decreased bldc value from 50 to 5, hoping that this change would make the oscillation more gentle, but I did not feel any difference. What else should I check? Viesturs -- 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-d2dcopy1 ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] 3-phase pwmgens for 7i39
On 29 September 2011 21:22, Viesturs Lācis viesturs.la...@gmail.com wrote: I checked all 47 patterns twice, none of them is rotating motor smoothly. Are you in qh or pure h mode? It might be that it switched to sinusoidal half way through (and that that isn't set up right) -- atp Torque wrenches are for the obedience of fools and the guidance of wise men -- 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-d2dcopy1 ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] 3-phase pwmgens for 7i39
On Thu, 29 Sep 2011, andy pugh wrote: Date: Thu, 29 Sep 2011 20:30:56 +0100 From: andy pugh bodge...@gmail.com 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] 3-phase pwmgens for 7i39 On 29 September 2011 20:15, Viesturs L??cis viesturs.la...@gmail.com wrote: Fault is true. I'm sorry, but I do not really understand, how exactly can I fix that. There is a parameter .3pwmgen.N.fault-invert Also if you look at your dmesg and the 7I39 manual you can find which sense line is wired to the fault input and terminate it appropriately (its not used on the 7I39, just passed through) -- atp Torque wrenches are for the obedience of fools and the guidance of wise men -- 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-d2dcopy1 ___ 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-d2dcopy1___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] 3-phase pwmgens for 7i39
Config string says qh,qh,qh. Should I change something? Viesturs On 2011. gada 29. Sep. 22:38, andy pugh bodge...@gmail.com wrote: On 29 September 2011 21:22, Viesturs Lācis viesturs.la...@gmail.com wrote: I checked all 47 patterns twice, none of them is rotating motor smoothly. Are you in qh or pure h mode? It might be that it switched to sinusoidal half way through (and that that isn't set up right) -- atp Torque wrenches are for the obedience of fools and the guidance of wise men -- 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-d2dcopy1 ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users -- 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-d2dcopy1 ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] 3-phase pwmgens for 7i39
2011/9/29 Viesturs Lācis viesturs.la...@gmail.com: Config string says qh,qh,qh. Should I change something? Yes, for working out the hall pattern, use h,h,h -- atp Torque wrenches are for the obedience of fools and the guidance of wise men -- 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-d2dcopy1 ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Emc-users Digest, Vol 65, Issue 66
Thanks John, I'll check the EMC manual. The machine is pretty new and there does not seem to be any backlash. -- Message: 7 Date: Thu, 29 Sep 2011 06:03:48 -0500 From: John Thornton bjt...@gmail.com Subject: Re: [Emc-users] calibrating stepper motor cnc To: Enhanced Machine Controller (EMC) emc-users@lists.sourceforge.net Message-ID: 4e845094.1080...@gmail.com Content-Type: text/plain; charset=ISO-8859-1; format=flowed There is some good info in the EMC manual on testing for lost steps. Have you checked for backlash? John On 9/29/2011 12:10 AM, Martin Patton wrote: Hi EMC users, I have EMC running on an old pc, latency number about 25000. I got an occasional real time error with latency number set at 22000. I drew a part in CamBam, generated some g-code and cut a part. The part looked right but the caliper says every dimension cut a little small. A circle pocket drawn 1.50 diameter cut about 1.42 in diameter, The tool diameter matched the tool specified in the cad program. Is there a good post on calibrating for a stepper motor machine? Thanks, Marty -- 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-d2dcopy1 ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users -- -- 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-d2dcopy1 -- ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users End of Emc-users Digest, Vol 65, Issue 66 * -- All of the data generated in your IT infrastructure is seriously valuable. Why? It contains a definitive record of application performance, security threats, fraudulent activity, and more. Splunk takes this data and makes sense of it. IT sense. And common sense. http://p.sf.net/sfu/splunk-d2dcopy2 ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
[Emc-users] VFD Speed Input
I'm trying to get my Shizuoka going after being idle during the Summer. Some of the parts had fallen off. So, in putting it back together I attended to an issue that bothered me from before. The SPI DAC I use to feed the 0-10 V input to the spindle VFD wanders a bit and is enough to notice the speed change at the spindle. I suspect the problem is that the VFD and DAC have different supplies and grounds. I decided to try a different approach and rigged up an opto-isolator which switches the 10V speed supply to the 0-10V input. I feed the transmit side of the opto-isolator with a PWM signal. I get much less wander, but after adjusting the scale, I realized only the first 10% of the PWM range is used to get 0 to 100% RPM (10V). I would like to have 100% pwm correspond to 100% RPM or 10V input. I tried various resistors to limit the input current or to pull the input down, but I still get the same problem. Has anyone setup a PWM input to a VFD that utilizes the full PWM range? If so, please let me know how it can be done. There is a 20mA input also, but I don't know how it is supposed to work. I'll check the manual, but hints would be appreciated. Otherwise, I my need to resort to a digital potentiometer. Thanks for any help. -- Kirk Wallace http://www.wallacecompany.com/machine_shop/ http://www.wallacecompany.com/E45/index.html California, USA -- All of the data generated in your IT infrastructure is seriously valuable. Why? It contains a definitive record of application performance, security threats, fraudulent activity, and more. Splunk takes this data and makes sense of it. IT sense. And common sense. http://p.sf.net/sfu/splunk-d2dcopy2 ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Need help with servo tuning
andy pugh wrote: Are the velocity tachs still active, so that the drives are closing a velocity loop, and EMC2 is commanding that velocity loop on the basis of position error? Yes, his tachs are connected to the analog servo amps. If that is the case, I wonder if EMC2 would work with only I and FF1? That is basically what he has, now. Jon -- All of the data generated in your IT infrastructure is seriously valuable. Why? It contains a definitive record of application performance, security threats, fraudulent activity, and more. Splunk takes this data and makes sense of it. IT sense. And common sense. http://p.sf.net/sfu/splunk-d2dcopy2 ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] VFD Speed Input
On 09/29/2011 06:24 PM, Kirk Wallace wrote: I'm trying to get my Shizuoka going after being idle during the Summer. Some of the parts had fallen off. So, in putting it back together I attended to an issue that bothered me from before. The SPI DAC I use to feed the 0-10 V input to the spindle VFD wanders a bit and is enough to notice the speed change at the spindle. I suspect the problem is that the VFD and DAC have different supplies and grounds. I decided to try a different approach and rigged up an opto-isolator which switches the 10V speed supply to the 0-10V input. I feed the transmit side of the opto-isolator with a PWM signal. I get much less wander, but after adjusting the scale, I realized only the first 10% of the PWM range is used to get 0 to 100% RPM (10V). I would like to have 100% pwm correspond to 100% RPM or 10V input. I tried various resistors to limit the input current or to pull the input down, but I still get the same problem. Has anyone setup a PWM input to a VFD that utilizes the full PWM range? If so, please let me know how it can be done. There is a 20mA input also, but I don't know how it is supposed to work. I'll check the manual, but hints would be appreciated. Otherwise, I my need to resort to a digital potentiometer. Thanks for any help. The PWM output (duty cycle) is 0 to 1.0. Is it possible you're telling it to go from 0 to 10, and by the time it reaches 10% of full scale it's already at 1.0? The 10 volts is only between the opto and the VFD input, nothing else needs to know about it. What about changing the scale. On ours (PWM driving a 0-10V output, which feeds the VFD's 0-10V input) we have the following in the ini file for a motor max speed of 2500 RPM. MAX_VELOCITY = 2500.0 OUTPUT_SCALE = 2500.0 OUTPUT_OFFSET = 0.0 MAX_OUTPUT = 2500.0 Karl -- All of the data generated in your IT infrastructure is seriously valuable. Why? It contains a definitive record of application performance, security threats, fraudulent activity, and more. Splunk takes this data and makes sense of it. IT sense. And common sense. http://p.sf.net/sfu/splunk-d2dcopy2 ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
[Emc-users] upgrade issue with 10.04 live CD
I have a recently upgraded to a new PC for my EMC installation and I am having difficulty getting EMC to run on the 10.04 Live CD. I know that it is not a hardware issue because I can run a 8.04 Live CD and everything works fine. The 10.04 CD boots and runs fine, however when I run the EMC it crashes with a long string of 'waiting for s.axes' errors. When I launch the latency test the window comes up but the times are all '0' and do not change regardless of computer usage. There appear to be no errors when I check dmesg after running Latency_test. I have tried to boot with isolcpus=0 as I have found in the forums, however it behaves the same. Any ideas? I need to run the 10.04 CD because I would like to have the additional software in that distro. many thanks, marc -- All of the data generated in your IT infrastructure is seriously valuable. Why? It contains a definitive record of application performance, security threats, fraudulent activity, and more. Splunk takes this data and makes sense of it. IT sense. And common sense. http://p.sf.net/sfu/splunk-d2dcopy2 ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Emc-users Digest, Vol 65, Issue 67
Brian, I will do as you suggest and cut a grid. What did you adjust in the ini file? Thanks, Marty Date: Thu, 29 Sep 2011 08:52:52 -0400 From: BRIAN GLACKIN glackin.br...@gmail.com Subject: Re: [Emc-users] calibrating stepper motor cnc To: Enhanced Machine Controller (EMC) emc-users@lists.sourceforge.net Message-ID: CALJbRT=nnsAc7x=iNF4Zn-2FV+CT9j4p=W19=9gy6hzemcm...@mail.gmail.com Content-Type: text/plain; charset=ISO-8859-1 One recommendation is to put a Vee cutter in your spindle and run a program where the Vee bit just touches the material in a uniform grid pattern. Take your part and measure all the positions from the 0,0. You may have your machine set up in such a manner that it is not just perfect. When I did this, I ended up adjusting the ini file slightly to correct for a 1/8 undershot over my 4' X axis and 1/16 on my 2' Y axis. On Thu, Sep 29, 2011 at 1:10 AM, Martin Patton mart...@gmail.com wrote: Hi EMC users, I have EMC running on an old pc, latency number about 25000. I got an occasional real time error with latency number set at 22000. I drew a part in CamBam, generated some g-code and cut a part. The part looked right but the caliper says every dimension cut a little small. A circle pocket drawn 1.50 diameter cut about 1.42 in diameter, The tool diameter matched the tool specified in the cad program. Is there a good post on calibrating for a stepper motor machine? Thanks, Marty -- All of the data generated in your IT infrastructure is seriously valuable. Why? It contains a definitive record of application performance, security threats, fraudulent activity, and more. Splunk takes this data and makes sense of it. IT sense. And common sense. http://p.sf.net/sfu/splunk-d2dcopy2 ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Emc-users Digest, Vol 65, Issue 68
Martin, I have been using CamBam for 7 of 40 trials. I am amazed at how easy it is to use so far. I drew a mount for a stepper motor that has a cutout profile with tabs, a pocket for the rim of the stepper and four spiral holes sized for tapping 10-32. With all this advice, I already cut a part in plastic that fits the motor. Jon, That is good advice too. I will look for backlash. How do I make it go awayif I find it? The mill is a Taig. Thanks, marty Martin Patton wrote: Hi EMC users, I have EMC running on an old pc, latency number about 25000. I got an occasional real time error with latency number set at 22000. I drew a part in CamBam, generated some g-code and cut a part. The part looked right but the caliper says every dimension cut a little small. A circle pocket drawn 1.50 diameter cut about 1.42 in diameter, The tool diameter matched the tool specified in the cad program. Is there a good post on calibrating for a stepper motor machine? First, you need to measure the actual movements with some kind of measuring tool, even if it is just using a dial caliper. You need to separate linear movement error, backlash and tool deflection. Without separating these different error mechanisms, you will not make the right correction. Linear error is pretty easy, put a pin in the spindle and measure between it and a block fixed to the table. If you move in the same direction, backlash will not alter the reading. Moving a number of inches so as to use nearly the full range of the caliper will give the most informative result. Then, approach the same coordinate from both directions and measure position. This may be harder to do with a caliper, as hopefully your backlash is relatively small. It is best to do this with a tenth-reading dial test indicator, if you have or can borrow one. Backlash alone could cause the error you report above. It will also leave 4 steps in the walls of a circular pocket, at those places where the axis needs to reverse, but takes a moment before the linear motion picks up on the other side of the backlash. If your problem is backlash, these steps should be really obvious on the part you mention above. Finally, it could be tool deflection, which will cause milled pockets to come out small. (Your measurement above seems to big to be tool deflection, however.) But, tool deflection will NOT leave bumps in the wall like backlash. Jon -- -- All of the data generated in your IT infrastructure is seriously valuable. Why? It contains a definitive record of application performance, security threats, fraudulent activity, and more. Splunk takes this data and makes sense of it. IT sense. And common sense. http://p.sf.net/sfu/splunk-d2dcopy2 ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] calibrating stepper motor cnc
?A circle pocket drawn 1.50 diameter cut about 1.42 in diameter, 1.5 / 1.42 = 1.0563 2mm / 12tpi = 1.0583 Just a thought, do you have metric leadscrews calibrated in TPI? -- atp Torque wrenches are for the obedience of fools and the guidance of wise men Nope. They are 20 tpi. Thanks, Marty -- All of the data generated in your IT infrastructure is seriously valuable. Why? It contains a definitive record of application performance, security threats, fraudulent activity, and more. Splunk takes this data and makes sense of it. IT sense. And common sense. http://p.sf.net/sfu/splunk-d2dcopy2 ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] upgrade issue with 10.04 live CD
On 09/29/2011 09:26 PM, marc foster wrote: I have a recently upgraded to a new PC for my EMC installation and I am having difficulty getting EMC to run on the 10.04 Live CD. I know that it is not a hardware issue because I can run a 8.04 Live CD and everything works fine. The 10.04 CD boots and runs fine, however when I run the EMC it crashes with a long string of 'waiting for s.axes' errors. When I launch the latency test the window comes up but the times are all '0' and do not change regardless of computer usage. There appear to be no errors when I check dmesg after running Latency_test. I have tried to boot with isolcpus=0 as I have found in the forums, however it behaves the same. Any ideas? I need to run the 10.04 CD because I would like to have the additional software in that distro. It's possible you have some hitherto untried hardware, and it's got some kind of problem with the new RTAI Linux kernels in our 10.04 distro. Please give us some details about your hardware. What make model motherboard? What CPU? How much RAM? -- Sebastian Kuzminsky -- All of the data generated in your IT infrastructure is seriously valuable. Why? It contains a definitive record of application performance, security threats, fraudulent activity, and more. Splunk takes this data and makes sense of it. IT sense. And common sense. http://p.sf.net/sfu/splunk-d2dcopy2 ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Emc-users Digest, Vol 65, Issue 68
On Friday, September 30, 2011 12:30:55 AM Martin Patton did opine: Martin, I have been using CamBam for 7 of 40 trials. I am amazed at how easy it is to use so far. I drew a mount for a stepper motor that has a cutout profile with tabs, a pocket for the rim of the stepper and four spiral holes sized for tapping 10-32. With all this advice, I already cut a part in plastic that fits the motor. Jon, That is good advice too. I will look for backlash. How do I make it go awayif I find it? The mill is a Taig. Generally, 2 places to look, but I'm not a taig owner, mine is the small HF. First is end play in the screw mounts, with the handle retainer being the usual method of adjusting that clearance, but if there are no bearings you need to leave about a thou clearance there. I found some thin ball thrust washers, so mine are slightly preloaded playless now. Second is the nut the screw is turning in, and in the economy stuff it is usually a long, lots of threads nut that is sawn nearly through, and either cap screws to pull the saw slot together, or jack screws to split the saw slot even wider. Generally, getting that slop down to 3 thou won't last too long due to wear, but if you keep jacking on the screws it will eventually wear in and can be set at maybe 2 thou without binding. Emc has backlash comp settings that if you stay on top of the wear, can cut bearing pockets that are quite close to round, half a thou is not a lot of trouble. To get closer, one has to go to ball screws, which can be backlash free at normal loading. But those will be $200-500 a copy. Thanks, marty Martin Patton wrote: Hi EMC users, I have EMC running on an old pc, latency number about 25000. I got an occasional real time error with latency number set at 22000. I drew a part in CamBam, generated some g-code and cut a part. The part looked right but the caliper says every dimension cut a little small. A circle pocket drawn 1.50 diameter cut about 1.42 in diameter, The tool diameter matched the tool specified in the cad program. Is there a good post on calibrating for a stepper motor machine? First, you need to measure the actual movements with some kind of measuring tool, even if it is just using a dial caliper. You need to separate linear movement error, backlash and tool deflection. Without separating these different error mechanisms, you will not make the right correction. Linear error is pretty easy, put a pin in the spindle and measure between it and a block fixed to the table. If you move in the same direction, backlash will not alter the reading. Moving a number of inches so as to use nearly the full range of the caliper will give the most informative result. Then, approach the same coordinate from both directions and measure position. This may be harder to do with a caliper, as hopefully your backlash is relatively small. It is best to do this with a tenth-reading dial test indicator, if you have or can borrow one. Backlash alone could cause the error you report above. It will also leave 4 steps in the walls of a circular pocket, at those places where the axis needs to reverse, but takes a moment before the linear motion picks up on the other side of the backlash. If your problem is backlash, these steps should be really obvious on the part you mention above. Finally, it could be tool deflection, which will cause milled pockets to come out small. (Your measurement above seems to big to be tool deflection, however.) But, tool deflection will NOT leave bumps in the wall like backlash. Jon -- -- All of the data generated in your IT infrastructure is seriously valuable. Why? It contains a definitive record of application performance, security threats, fraudulent activity, and more. Splunk takes this data and makes sense of it. IT sense. And common sense. http://p.sf.net/sfu/splunk-d2dcopy2 ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users Cheers, Gene -- There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order. -Ed Howdershelt (Author) The most difficult thing in the world is to know how to do a thing and to watch someone else doing it wrong, without commenting. -- T.H. White -- All of the data generated in your IT infrastructure is seriously valuable. Why? It contains a definitive record of application performance, security threats, fraudulent activity, and more. Splunk takes this data and makes sense of it. IT sense. And common sense.
Re: [Emc-users] VFD Speed Input
On Thu, 2011-09-29 at 20:44 -0700, Karl Cunningham wrote: ... snip The PWM output (duty cycle) is 0 to 1.0. Is it possible you're telling it to go from 0 to 10, and by the time it reaches 10% of full scale it's already at 1.0? The 10 volts is only between the opto and the VFD input, nothing else needs to know about it. What about changing the scale. Thanks for your reply Karl. I am using a Pluto-P to get the PWM, so I didn't have HALscope to check the actual PWM output. I had to drag out my real oscilloscope and attached it to the opto-isolator transmitter and verified that the PWM to the opto was about 10% with the VFD display indicating 100% RPM (60 Hz). It seems the input doesn't need much of a charge to keep it topped up. I tried a resistor in series with the input pin, but this just lowered the maximum signal rather than spreading it out on the PWM range. On ours (PWM driving a 0-10V output, which feeds the VFD's 0-10V input) we have the following in the ini file for a motor max speed of 2500 RPM. MAX_VELOCITY = 2500.0 OUTPUT_SCALE = 2500.0 OUTPUT_OFFSET = 0.0 MAX_OUTPUT = 2500.0 I think I got this part sorted out. My maximum of 3700 RPM gives me 1.00 into the PWM generator. It's just that the real maximum RPM kicks in much earlier. I can make it look like it works by fiddling with the scale value, but then I get .04 going to the PWM generator at 3700 RPM. It works okay, in fact it took me a while to realize there was a problem, but then most of the available PWM resolution gets lost. I wish I knew what circuit is behind the VFD's 10V supply, input, and common control terminals. Then I might be able to figure out what it needs. The one example that I know that works properly is a potentiometer on the three terminals, so it seems to me that all three terminals are needed in some fashion. So far, I'm switching the high side to the input, which corresponds to having the pot turned fully up during the PWM high period. It may be that I need another opto to switch the input to the low side for the pot turned fully down, or PWM low. I would need an inverter chip to get PWMnot for the low side opto, and then I am worried about getting shoot through as the high side shuts down and the low side turns on. Another thing comes to mind, my serial DAC uses it's own voltage reference - I wonder if I should use the VFD 10V terminal instead. http://www.wallacecompany.com/machine_shop/EMC2/serial_dac/ (U2 on schematic) A digital potentiometer might be the easiest solution, but could potentially have it's own issues. Besides it's not like I am the first person to hook a PWM signal to a VFD. I must be missing something simple. PS, this VFD doesn't have Modbus or other communication port, or I would have used it already. :( -- Kirk Wallace http://www.wallacecompany.com/machine_shop/ http://www.wallacecompany.com/E45/index.html California, USA -- All of the data generated in your IT infrastructure is seriously valuable. Why? It contains a definitive record of application performance, security threats, fraudulent activity, and more. Splunk takes this data and makes sense of it. IT sense. And common sense. http://p.sf.net/sfu/splunk-d2dcopy2 ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
