> -----Original Message-----
> From: Greg Bernard [mailto:[email protected]]
> Sent: September-15-20 4:49 PM
> To: Enhanced Machine Controller (EMC)
> Subject: Re: [Emc-users] False mesages at lcnc launch
>
> So the Raspberry Pi worked ok with the 7i92? Good to hear because I am
> going to upgrade my machine soon and was thinking of using that combination.
>
My only observation that has me wondering is when homing the Z axis stepper
motor makes the occasional odd sound. The DC servos don't but then they're
closed loop and a bump in stepper pulses may well be masked.
Now I know the Z axis run with the 7i92 doesn't do that when I'm running with
the PC and I also know I still have some voltage power supply issues with the
Pi4. And I haven't done any of the config changes to supercharge the Pi4.
Also I'm running into an HDMI to VGA dongle that may well be holding up the Pi
occasionally. I should find a loose monitor with HDMI input.
But there are a few people out there using the Pi, 7i92 and stepper motors
without problems.
>
> On Tue, Sep 15, 2020 at 11:39 AM John Dammeyer <[email protected]>
> wrote:
>
> > > -----Original Message-----
> > > From: Jon Elson [mailto:[email protected]]
> > > Sent: September-15-20 8:50 AM
> > > To: Enhanced Machine Controller (EMC)
> > > Subject: Re: [Emc-users] False mesages at lcnc launch
> > >
> > > On 09/15/2020 08:40 AM, Gene Heskett wrote:
> > > >
> > > > Axis X Fault
> > > > Axis Z Fault
> > > > Axis X Fault
> > > > Axis Z Fault
> > > >
> > > Note that a lot of drives present the fault signal when
> > > disabled. I have had to build a module to "cover" that
> > > signal when not enabled so that LinuxCNC can be brought out
> > > of E-stop.
> > >
> > > Jon
> >
> > I did the same thing with a small PIC micro-controller because the STMBL
> > drives fault on low motor voltage so the fault is there before the DC High
> > voltage is applied which causes the ESTOP which prevents the DC High
> > Voltage from being turned on which causes the STMBL drive fault...
> >
> > All because the system enable switches on the DC power supplies for the
> > various motors and also asserts the drive enable. There was probably a way
> > to fix that in the HAL file but this system had to work with both
> > Win-XP/MACH3 and LinuxCNC and MachineKit for the Beagle.
> >
> > All three systems attached to the BoB via a PC based parallel port
> > connection but how the port signals are created varies with the system.
> >
> > In the case of the:
> > LinuxCNC PC it can use the stock parallel port or the MESA 7i92H
> > Raspberry Pi4 the MESA 7i92H
> > BeagleBone Black the Xylotex BBB_DB25 (haven't tried that in a while)
> > WIN-XP either PC parallel port or USB Smooth Stepper.
> >
> > It's been an interesting research project.
> > John Dammeyer
> >
> > >
> > >
> > > _______________________________________________
> > > Emc-users mailing list
> > > [email protected]
> > > https://lists.sourceforge.net/lists/listinfo/emc-users
> >
> >
> >
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> >
>
>
> --
> "Anyone who believes exponential growth can go on forever in a finite world
> is either a madman or an economist."
> -Kenneth Boulding, economist
> Corporations are NOT people and money is NOT speech!
>
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