Hi Ron, Well other than the rather annoying motor start-up when LinuxCNC is stopped issue the reason for the test set is to now install a different BIT file into the 7i92H, use a slightly modified to replace the PWM/DIR with stepper. 14 1 IOPort StepGen 5 Step/Table1 (Out) 16 5 IOPort StepGen 5 Dir/Table2 (Out)
And then set a couple of parameters in the Bergerda to use pulse for speed rather than 0-10V. I don't have to change anything in the little yellow box. It's already configured to deliver differential stepping and direction signals to the Bergerda. The 0-10V is on a separate connector and Analog direction is on a different pin. If that works then I don't need the 0-10V module anymore. The problem before was StepGen5 was on the second parallel port and the Encoder0 was on the first plus it stepped on the standard ESTOP DB25-10 pin. So now I can add an encoder to the mill spindle and run this slower than about 150 RPM. More when it happens. John > -----Original Message----- > From: R C [mailto:cjv...@gmail.com] > Sent: June-14-21 8:40 PM > To: emc-users@lists.sourceforge.net > Subject: Re: [Emc-users] all the MESA cards talk made me think > > that's ool.� Once I clear out my "work bench" a bit,� I might et up a > few things,� possbly even with an RPI4 or so, and just test some setups. > > > I wonder if I have more fun playing/messing with these CNC machines the > actually doing stuff with them� (which I want to, I have that telescope > project too). > > > Ron > > > On 6/14/21 9:27 PM, John Dammeyer wrote: > > Here's my test setup. > > > > from left to right. > > 1. MESA 7i92H connected via Ethernet to the Pi4 1Gb sitting under my > > monitor. > > The Pi is running LinuxCNC. > > 2. Probotix Break out Board and although it could be isolated I'm using the > > same 12V supply for both sides with the BLK/WHT > twisted wires. > > It generates the 5V to run the MESA 7i92H. BLK/RED twisted wire. > > 3. The PWM Spindle Control board I pulled from the mill because I was too > > lazy to assemble another one for this testing. > > It too is powered from the 12VDC adaptor (actually more like about > > 16V) Grey jacket cable to black connector. > > This holds the little PWM to 10V module and is driven by the BoB via > > DB25 pins 14-PWM, 16-DIR and 1-ENABLE > > 4. Bergerda AC Servo showing that it's running the motor at 558RPM which I > > set from the LinuxCNC buttons. > > > > Now the first surprise when I stopped the LinuxCNC program. I've been > > spoiled by the ChargePump on the PMDX-126 BoB I use. > With this small Probotix board the program stopped and the parallel port > output pins all went high. Not a problem for a stepper > motor. Big issue when the PWM input thinks that is 100% and the ENABLE > signal which is active high goes high. Motor started > turning at full speed. > > > > I'm not surprised. So many of the Break Out Boards out there are designed > > only with stepper motors in mind but in this case this is > the spindle. This enable signal would also run a master power relay which > would also stay on after LinuxCNC went away. Not good. > > > > With the Charge Pump gone the Break Out Board automatically disables > > outputs so they can't source current out to a drive and it > definitely switches off any relays on the BoB. So not too impressed with > this small BoB. > > > > Or maybe the issue is with the 7i92? Perhaps on loss of communications > > with the host it should set the outputs low. It's looking > like it sets them high since the PWM output was 0 and the ENABLE output is > also LOW set by the "Toggle Machine Power F2" button > on the user interface. > > > > > > > > > >> -----Original Message----- > >> From: R C [mailto:cjv...@gmail.com] > >> Sent: June-14-21 8:14 PM > >> To: emc-users@lists.sourceforge.net > >> Subject: Re: [Emc-users] all the MESA cards talk made me think > >> > >> > >> On 6/14/21 3:50 AM, andy pugh wrote: > >>> On Mon, 14 Jun 2021 at 02:16, R C <cjv...@gmail.com> wrote: > >>> > >>>> I have seen the 7i92? mentioned, and others,? can they do multiple > >>>> stepper motors?? (right now I am using a parallel BOB,? that connects > >>>> to? steopper drivers (ala DM542), which drive the actual steppers.) > >>> The Mesa FPGA card replaces the parport card, and in some cases also > >>> replaces the BoB. > >>> > >>> The 5i25 and 7i92 replace only the Parport card and would retain the > >>> same BoB. They can both be used with the same BoB as you currently > >>> use, or you could use a 7i76 (probably overkill) > >> right I have been looking at some.? I don't mind using existing BOBs, > >> since I have several, and since I am not really running high-tech, > >> industrial stuff..? it shouldn't be too expensive. > >> > >> (I saw some between 50-100 bucks, that would work (?) > >> > >> > >>> Alternatively you could look at a 7i96 or 7i76E which both connect to > >>> the ethernet port and replace both the parport card and the BoB. > >> I'll look into those too. > >> > >> I wonder how these things need to be programmed though, John explained > >> some of that.? I think in a bit, when I have more time, I? just buy a > >> few and just jum in (but build a test setup first. > >> > >> > >> Ron > >> > >> > >>> There are not any PCI cards which also directly replace the BoB, and > >>> none that replace the stepper drivers. > >>> > >> _______________________________________________ > >> Emc-users mailing list > >> Emc-users@lists.sourceforge.net > >> https://lists.sourceforge.net/lists/listinfo/emc-users > >> > >> > >> _______________________________________________ > >> Emc-users mailing list > >> Emc-users@lists.sourceforge.net > >> https://lists.sourceforge.net/lists/listinfo/emc-users > > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
