On Fri, 8 Dec 2017, Gene Heskett wrote:
Date: Fri, 8 Dec 2017 20:22:40 -0500
From: Gene Heskett <[email protected]>
Reply-To: "Enhanced Machine Controller (EMC)"
<[email protected]>
To: "Enhanced Machine Controller (EMC)" <[email protected]>
Subject: [Emc-users] Wrong polarity of pwm?
Question for Peter C. Wallace;
I swapped bobs on the main channel, p3 on a 5i25, with prob_rfx2 in the
fpga.
Somehow that inverted the pwmgen output. I tried inserting the line:
setp hm2_5i25.0.gpio.001.invert-output true in my hal file
All that did was cut the output down to about a volt, but the slowest
speed is still 99% low, with a narrow + pulse at 20 KHz. Clicking + in
the axis gui makes the + part of the pulse wider until its around 98%.
That is what it should be at creep speed.
This is not the desired pulse because normal wiring puts a 5volt rail on
the + terms, while feeding at low speeds, a narrow pulse to ground that
is normally connected to the - input. I am in the process of rewiring
that to put a real ground on the - terminal, and feed the bobs pulses to
the + terminal instead. This isn't as easy as it sounds as it adds a
couple wires that have to fit
So how does one invert the pwmgen.0's output if the above line won't?
If that is a prob_rxf2 config then
setp hm2_5i25.0.gpio.001.invert-output true
will invert the PWM output
If this does no happen, my guess would be that either theres another
setp hm2_5i25.0.gpio.001.invert-output
statement in the hal file or there's an electrical issue somewhere
Thanks Peter.
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>
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Peter Wallace
Mesa Electronics
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