On Friday 16 October 2020 15:58:07 Peter C. Wallace wrote:
> > 12 volts to an input before they see a true?
>
> 7I76 inputs need > 60% of field voltage to register high
> and < 40% of field voltage to register low
Field voltage is 12 volts. From a teeny external 15 watt supply.
That fixed that. N
On Friday 16 October 2020 15:58:07 Peter C. Wallace wrote:
> On Fri, 16 Oct 2020, Gene Heskett wrote:
> > Date: Fri, 16 Oct 2020 15:49:17 -0400
> > From: Gene Heskett
> > Reply-To: "Enhanced Machine Controller (EMC)"
> >
> > To: "'Enhanced Machine Controller (EMC)'"
> > Subject: [Emc-users]
On Fri, 16 Oct 2020, Gene Heskett wrote:
Date: Fri, 16 Oct 2020 15:49:17 -0400
From: Gene Heskett
Reply-To: "Enhanced Machine Controller (EMC)"
To: "'Enhanced Machine Controller (EMC)'"
Subject: [Emc-users] For Peter
I went out to clear the input pins I'd need for the 2nd encoder I was
g
On Friday 16 October 2020 14:03:24 Peter C. Wallace wrote:
> > So, 2 questions for Peter CW: Can I run the 5i25's pwm-gens in
> > different modes? If so, how?
>
> PWM modes are per channel so can be different on a per channel basis
>
> Beware using bare FPGA I/O for driving HBridges that have non-
I went out to clear the input pins I'd need for the 2nd encoder I was
going to use with the BS-1 clone.
Somewhere the mirror got broken but without any smoke.
At lcnc launch, it complained that the first 3 field input "-nots" did
not exist, so they got their net lines commented out. They corres
On Friday 16 October 2020 12:26:11 John Dammeyer wrote:
> > From: Thaddeus Waldner [mailto:thadw...@gmail.com]
> > Perhaps a more significant advantage of the servo drive described by
> > John Dammeyer is that it has a current control loop running inside
> > of the LinuxCNC velocity control loop.
So, 2 questions for Peter CW: Can I run the 5i25's pwm-gens in different
modes? If so, how?
PWM modes are per channel so can be different on a per channel basis
Beware using bare FPGA I/O for driving HBridges that have non-isolated
inputs. These often have considerable ground bumping (in the m
On 10/16/2020 12:06 PM, Gene Heskett wrote:
But, given fast enough switching fets, can this
disadvantage not be addressed with a combo of near the
high limit for pwm frequency, and a suitable,
non-saturating toroid in series with the motor?
Yes, that is what I do with my PWM servo amplifiers.
On Thursday 15 October 2020 23:03:00 Jon Elson wrote:
> On 10/15/2020 09:49 PM, John Dammeyer wrote:
> > The theory is that if the PWM signal is high the H-Bridge is
> > switched to say turn the motor clockwise. If the PWM signal is low
> > the H-Bridge is switch to turn the motor counter clockwi
> From: Thaddeus Waldner [mailto:thadw...@gmail.com]
> Perhaps a more significant advantage of the servo drive described by John
> Dammeyer is that it has a current control loop running
> inside of the LinuxCNC velocity control loop.
> Pretty fancy to do that on an 8-bit microcontroller. That A
Perhaps a more significant advantage of the servo drive described by John
Dammeyer is that it has a current control loop running inside of the LinuxCNC
velocity control loop.
Pretty fancy to do that on an 8-bit microcontroller. That ATTiny has an on-chip
analog comparator.
> On Oct 15, 2020, a
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