On Tuesday 21 February 2017 12:15:22 Valerio Bellizzomi wrote: > From the LinuxCNC manual I see an example : > > > loadrt pwmgen output_type=0 > addf pwmgen.update servo-thread > addf pwmgen.make-pulses base-thread > net spindle-speed-cmd motion.spindle-speed-out => pwmgen.0.value > net spindle-on motion.spindle-on => pwmgen.0.enable > net spindle-pwm pwmgen.0.pwm => parport.0.pin-09-out > # Set the spindle's top speed in RPM > setp pwmgen.0.scale 1800 > > > is this sufficient to get the spindle going ? > This would be for purely software driving, which generally cannot drive a machine to anything resembling high speeds when it is supposed to be making a G0 move.
Thats is why the majority of us use a smart card, which in some cases can be its own breakoutboard too. Such is the case with all but one of my machines, and that one can only move around 8ipm cutting and 10 or so at full throttle. My stuff with more std interfaces can move 40 to 75 ipm without missing a beat. Also associated in the speed limits are the limited drive currants available from the parport. Getting 10 mills out to drive the stepper drivers doesn't turn on the opto's all that fast, so that contributes to the speed limit. Most of the accessory boards can sink 24 mills, easily turning the led on in the isolation circuitry of the driver. But the most telling in using a parport with direct drive is the pulse jitter, as indicated by running latency-test for half an hour or so. Every time you see a spike/raise in the displayed time of the base-thread, thats a long step, and the motor may well stop while waiting for the next step, but when the cpu, even running an rtai kernel, will then try to catch up when it does get free of whatever it was doing, but the motor isn't able to re-accelerate that fast so it stalls. And everytime it stalls, you have a damaged or wrecked part. That makes spending the sheckels for a smart card interface very much desirable. If that interface can also be the BoB, thats a desirable economy. There are several mesa cards that meet that criteria, and I'm fond of the 7i90HD, which gives you a big pile of very steady heartbeat signals, as high as 8 stepper drivers, 4 pwm generators, and 4 encoder inputs. What you do not use, can be removed from the load configuration, and those pins then used as General Purpose I/O, for a grand total of 72 of them. The 7i90 can be driven by a std EPP capable printer port, (yours may or may not be EPP capable, and mainboard manuals do not always state the truth) or by an SPI port. So please reconsider how you are going to interface to the machinery. Getting some isolation between the computer and its jitter pulse generation is something you'll never regret. Where on this ball of rock and water are you? > On Tue, 2017-02-21 at 11:26 -0500, Gene Heskett wrote: > > On Tuesday 21 February 2017 07:33:28 Valerio Bellizzomi wrote: > > > Hello, > > > the SpinX1 manual says it acts like a potentiometer, the figure on > > > page C-13 of the VFD's manual shows the VIA contact to be > > > connected to an external potentiometer > > > > > > is that the right way to connect the spinx1 ? > > > > Yes, it has silk screened names. Its a totally isolated thing on the > > VFD side. The vfd should have a common, a nominally 12 volt plus > > source when measured to the common. > > > > The fwd and rev signals are separated by the spinx1, and generally > > on the VFD side respond to a closure to this common to enable it to > > respond to the voltage from the "arm" of the potentiometer. On the > > computer side, you will need to dedicate on pin of the BoB as an > > enable signal and wire it up in the hal file. > > > > You will need, if using the mesa cards, something that faintly > > resembles this to get the LCNC speed signal hooked to the spinx1: > > ############################################################## > > # Hook pwmgen.00 to the spindle speed and set for PDM output # > > ############################################################## > > setp hm2_[HOSTMOT2](BOARD).0.pwmgen.00.scale > > [SPINDLE_9]PWMGEN_S_SCALE setp > > hm2_[HOSTMOT2](BOARD).0.pwmgen.pwm_frequency > > [SPINDLE_9]PWMGEN_S_FREQ #setp > > hm2_[HOSTMOT2](BOARD).0.pwmgen.pwm_freq > > [SPINDLE_9]PWMGEN_S_FREQ setp > > hm2_[HOSTMOT2](BOARD).0.pwmgen.00.output-type > > [SPINDLE_9]PWMGEN_OUTPUT_TYPE setp > > hm2_[HOSTMOT2](BOARD).0.pwmgen.pdm_frequency > > [SPINDLE_9]PDMGEN_PDM_FREQUENCY > > > > The data being referred in the right hand argument to needs assigned > > in the [SPINDLE_9] section of your .ini file. > > > > Now, I don't see below, what breakout you are using so I'll just > > copy and paste from my setup. Keep in mind that these will NOT match > > yours, but will show you approximately what you need. > > First, setup the enable signal which in my case uses a gpio > > pin in my 7i90 card. > > > > First, you need to set the output pins for all axis's used as > > inverting and true low, > > > > # Turn pulses to true low, opendrain so they are closures to ground. > > # stepgen 00 > > setp hm2_[HOSTMOT2](BOARD).0.gpio.000.invert_output 1 > > setp hm2_[HOSTMOT2](BOARD).0.gpio.000.is_opendrain 1 > > setp hm2_[HOSTMOT2](BOARD).0.gpio.001.invert_output 1 > > setp hm2_[HOSTMOT2](BOARD).0.gpio.001.is_opendrain 1 > > # stepgen 01 > > setp hm2_[HOSTMOT2](BOARD).0.gpio.002.invert_output 1 > > setp hm2_[HOSTMOT2](BOARD).0.gpio.002.is_opendrain 1 > > setp hm2_[HOSTMOT2](BOARD).0.gpio.003.invert_output 1 > > setp hm2_[HOSTMOT2](BOARD).0.gpio.003.is_opendrain 1 > > # stepgen 03 > > setp hm2_[HOSTMOT2](BOARD).0.gpio.018.invert_output 1 > > setp hm2_[HOSTMOT2](BOARD).0.gpio.018.is_opendrain 1 > > setp hm2_[HOSTMOT2](BOARD).0.gpio.019.invert_output 1 > > setp hm2_[HOSTMOT2](BOARD).0.gpio.019.is_opendrain 1 > > > > # the above gpio numbers correspond to the outputs of the canned > > code in the FPGA's installed firmware for the stepgens I use, and > > the PDM signal from the pwmgen module in the cards firmware. > > > > And the reason I keep calling it PDM is that is a ditherless > > method of getting quite smooth speed signals from a basically > > digital circuit. That is done as the modules are enabled in > > the .ini file by a line grouping like this: > > > > [SPINDLE_9] > > # 16.6 is close to 100 revs per click in low belt position > > PWMGEN_S_SCALE = 16.6 > > # make it run in PDM mode, is self smoothing then > > PWMGEN_S_FREQ = 1 > > PWMGEN_OUTPUT_TYPE = 3 > > PDMGEN_PDM_FREQUENCY = 10000 > > > > # the SCALE above sets it to run the spindle at 100 rpm per > > click on the + button, when the backgear is not engaged and > > the belt is in the lowest speed grooves of the pulleys. All of > > these settings are of course your personal choices. PDM_FREQUENCY > > is a balance between update rate and quantization of the speed > > change. A lower frequency is higher resolution but it should be fast > > enough so the motor speed doesn't ripple. 10000 is a good choice for > > me with my fake vfd.. > > > > sets emcmot.00.enable FALSE > > net emcmot.00.enable <= joint.0.amp-enable-out > > net emcmot.00.enable => hm2_[HOSTMOT2](BOARD).0.stepgen.03.enable > > Thats not all of that stuff, but you'll get the idea. > > > > A gpio pin is an input unless told otherwise, and all signals > > are closures to ground, with 5 volts fed to the + terminals on > > the axis motor drivers, with your step/dirs connected to the - > > terminal on the drivers control plug. > > > > #################################################################### > >############# # Setup vfd drive enable yadda yadda, building down > > from top down forward first # # The SpinX1 only needs pwm and dir I > > thought, but needs an ena(ble) too. > > #################################################################### > >############# # start with SpinX1's dir which has to be converted to > > an output of the correct polarity setp > > hm2_[HOSTMOT2](BOARD).0.gpio.071.is_output 1 > > setp hm2_[HOSTMOT2](BOARD).0.gpio.071.invert_output 1 > > setp hm2_[HOSTMOT2](BOARD).0.gpio.071.is_opendrain 1 > > # this is the green jumper wire from the SpinX1's FWD, to 7i90-p3-47 > > net reverse_vfd <= motion.spindle-reverse => > > hm2_[HOSTMOT2](BOARD).0.gpio.071.out > > > > # and the spinX1 does need an enable, so setup gpio.070 for that > > setp hm2_[HOSTMOT2](BOARD).0.gpio.070.is_output 1 > > setp hm2_[HOSTMOT2](BOARD).0.gpio.070.invert_output 1 > > setp hm2_[HOSTMOT2](BOARD).0.gpio.070.is_opendrain 1 > > # net line moved to be combined with enable_vfd below > > net enable_vfd <= motion.spindle-on > > net enable_vfd => hm2_[HOSTMOT2](BOARD).0.pwmgen.00.enable > > net enable_vfd => hm2_[HOSTMOT2](BOARD).0.gpio.070.out > > > > The above demonstrates then when a "net" signal is defined, the next > > argument on that line becomes the source for that signal. The next > > two lines show where that signal is to be sent. > > IF they are in the sequence shown, the => and <= gismo's are > > optional. > > > > Currently, do NOT put a comment as a trailing #comment, put it on > > its own line. > > > > ########################################################### > > # make the vfd's pdm drive unidirectional, fwd/rev handles that # > > # but the SpinX1 needs a DIR, which is on P1-43 > > ########################################################### > > net spindle-vel-cmd-rps <= motion.spindle-speed-out-rps > > net spindle-vel-cmd-rps => spindle-abs.in > > # this come out on P1-41 as the pulse Duration Modulated signal to > > the SpinX1, red jumper net spindle-unispeed <= spindle-abs.out => > > hm2_[HOSTMOT2](BOARD).0.pwmgen.00.value > > > > This is, without a doubt, incomplete, but with the halmeters help, > > you should see whats missing. Yell if the water is still rising. :) > > > > > On Thu, 2017-02-16 at 08:56 -0800, Kirk Wallace wrote: > > > > On 02/16/2017 03:37 AM, Valerio Bellizzomi wrote: > > > > ... snip > > > > > > > > > the VFD is a Toshiba VFS15-4037PL-W, it has a Forward input, a > > > > > Reverse input, and a current speed input (and alternatively a > > > > > 0-10V input). There isn't an enable input. I do not need the > > > > > reverse so it should be two parallel pins, one for forward and > > > > > one for speed. > > > > > > > > ... snip > > > > > > > > I found a manual here: > > > > https://inverterdrive.com/file/Toshiba-VFS15-User-Manual > > > > > > > > I usually first check the overview graphic which seems to be on > > > > page B-4. I see the F terminal which could just be shorted to > > > > common to activate it. The speed potentiometer is shown too. PWM > > > > could simulate that. I also see theRS485 connector. I did a > > > > search in the document for "485" and found page C-4, which shows > > > > some control options; terminal (relay), keypad, RS485 (Modbus?), > > > > CAN (cool), communication(what the heck?). Just below are some > > > > speed setting options. This should be a nice VFD. > > > > > > > > A little farther down from B-4 are the I/O circuit options. > > > > Looking at the F entry, it basically says shorting the F > > > > terminal to CC will start forward rotation. You can use a > > > > parallel port pin to control a small solid state relay or > > > > opto-isolator. It just needs to tolerate 24 Volts on the output. > > > > > > > > It looks like the VIA (voltage, input, analog?) is a speed > > > > input. The same parallel port pin to solid state relay or > > > > opto-isolator as F above may be used, except it only needs 10 > > > > Volt tolerence. Terminal PP is the 10 Volt source (CC common > > > > isn't needed, most likely). The signal from the parallel port > > > > pin should use PWM or PDM. > > > > > > > > If you have a BOB (Break Out Board), post a make/model and/or > > > > picture or other information. It may be useful for the above > > > > connections. > > > > > > > > It looks like page D-3 is a good place to start VFD programing. > > > > > > > > The above may be wrong or missing some information, so study the > > > > manual and decide for yourself what to do. I would get a mains > > > > input noise filter right of the bat, so you don't have to chase > > > > down weird issues while trying to learn how to use your VFD. > > > > Hmm... It looks like your VFD already has a built-in noise > > > > filter. > > > > > > ------------------------------------------------------------------ > > >---- -------- Check out the vibrant tech community on one of the > > > world's most engaging tech sites, SlashDot.org! > > > http://sdm.link/slashdot > > > _______________________________________________ > > > Emc-users mailing list > > > Emc-users@lists.sourceforge.net > > > https://lists.sourceforge.net/lists/listinfo/emc-users > > > > Cheers, Gene Heskett > > ---------------------------------------------------------------------- >-------- Check out the vibrant tech community on one of the world's > most engaging tech sites, SlashDot.org! http://sdm.link/slashdot > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users Cheers, Gene Heskett -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) Genes Web page <http://geneslinuxbox.net:6309/gene> ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, SlashDot.org! http://sdm.link/slashdot _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
