On Thu, 24 Jan 2019, Gene Heskett wrote:
Date: Thu, 24 Jan 2019 02:33:54 -0500
From: Gene Heskett <[email protected]>
Reply-To: "Enhanced Machine Controller (EMC)"
<[email protected]>
To: [email protected]
Subject: [Emc-users] PCW, spindle enable for pico pwm-servo, needs 12 volts.
On my G0704, which has the OEM motor I'm abusing, I've been studying up
on how to get a 12 volt enable signal, which currently is a sparkfun
contraption driven by a std bob signal.
But with the 7i76d, can I feed 12 volts into the pin a vfd's 12 volts
would normally drive, ground the Spindle- terminal, and get the 12 volts
for spindle enable from the Spindle Enable+? Page 18 seems to indicate
I could source a few ma that way. I'll be using a different pin for the
pwm signal that amplifier needs, probably the pwm will show u on step or
dir 4, on tb3?
The ENA+ and ENA- are just a (normally open) switch (OPTOcoupler transistor)
so can be use as such making sure you dont exceed the current rating (50 mA)
and obey the polarity
Obviously this is a bridge not crossed yet. And in investigating where
the pwm might show up, there isn't such a critter in the 5i25 as
programmed for the 7i76d! Looks like I will have to load a software
pwmgen and feed it out of a gpio on the 5i25's p2? Why is this not an
error?:
Standard 7I76 firmware does not have a PWM generator, there is firmware tha
replaces stepgen-04 with a PWM gen, if a 5V PWM signal is OK
http://freeby.mesanet.com/5i25_7i76_1px2d.bit
loadrt hm2_pci config="num_encoders=1 num_pwmgens=1 num_stepgens=4"
I'll sort it, but tis a surprise that no pwmgen shows in the halmeter
menu. Or is it there, and completely gobbled up by the builtin spinx1
in the 7i76d? Ack the 2 pass output yes its there. Must figure out how
to access its raw output... For the pico amp the analog out on tb4-2
that would feed a vfd's analog input is not usable. Looks like I'll need
a software pwmgen feeding a gpio on p2, And feed both pwmgens? Hummm.
Advice needed Peter. I don't think I'm seeing the whole picture.
Thanks.
Cheers, Gene Heskett
--
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Peter Wallace
Mesa Electronics
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