On Thu, 7 Feb 2019, Gene Heskett wrote:
Date: Thu, 7 Feb 2019 19:33:46 -0500
From: Gene Heskett <ghesk...@shentel.net>
Reply-To: EMC developers <emc-developers@lists.sourceforge.net>
To: emc-developers@lists.sourceforge.net
Subject: Re: [Emc-developers] 7i76 vs spinout signal
On Thursday 07 February 2019 15:49:09 Gene Heskett wrote:
On Thursday 07 February 2019 13:07:53 Gene Heskett wrote:
On Tuesday 05 February 2019 21:49:21 Gene Heskett wrote:
So ATM I have a reserved input for the probe, and the steppers to
wire step-dir sigs to, and I think put the probe on a 5 pin plug
thats not busy.
Then I should be ready to smoke test it by late tomorrow.. So far
I've not given the motors any power, safer that way. But I had to
redo the mechanics of the x home switch, buried under a bunch of
covers, its probably still not mechanically right, but I'll need
stepper power and a good light to see what needs to be done.
Got that all done, but wore out a knee, its about due for another
acid shot, giving me he!! this morning yet. Steppers all done, as
are home switches.
Correction, to clarify what I am doing to me when I take a copy to the
machine to build it.
I believe I've figured out how to squeeze the pwmservo's controls
into 1, 5 pin plug.
Connecting a ground to pin2 and pin4 on the servo hooks up a - for the
optos for pwm and dir. 1 wire. The shields in a two pair cable, use
pin 3 in the GS12-5 connector.
Feed regulated 5 volts to spindir+ right on the 7i76. no cable wire
Feed spindir- to servo pin 3, direction+. 2nd cable wire, will pullup
servo direction line.
To PCW:
But I got shaky making up that cable and connector and inadvertantly made
a solder blob short between spindir- and ground, with 5.11 volts on
spindir+. And spindir- isn't coming on even with the short removed now.
FWIW, all 5 of the contacts in this plug are in about a 5.5mm circle.
Next panel I'll use the GS16-5 plug, bigger and far easier for this old
man to work with.
Yeah you can definately fry the OPTO transistors by driving into shorted load
I've fixed the short, but may have toasted that driver chip. If it was
ptc protected, does it take a full everything off including the computer
to reset it, and how much cooldown time. Its had power but has not come
back in around 30 minutes. No heat either.
So sock it to me Peter. If its toes up for good, I can put the 2nd card
in, in which case can you fix this one?
Yes its fixable just needs a TLP127 OPTO and careful work with a SMT hot air
gun...
Thanks Peter.
feed 5 volts regulated to spindir+. wire internal to the interface box
Feed interface boxes +12 unswitched power over the cable to +12 volt
Feed regulated 12 volts to spinena+, Third wire
Feed spinena- to servo enable on pin 5.
Find pwmgen-01.pulse to PWM + on servo pin-1
Feed a signal from the Sainsmart's pwm-1-output to the pwm+ at pin1
on the servo is the 5th wire and the connector is full. Once thats
done, take 3/8" off the bottom of the swarf shield over the
x-home-switch, which will allow that to come back over the top of
the y motor, giving me back a sorely needed additional inch or more
of y motion. The table was coming forward but this swarf shield was
too long and was hitting the motor mount. If I clear that, I gain
nearly 1.5" of y motion. When I put that bellows cover on, I was far
more concerned with keeping swarf out of the y screw when I built it
4 years ago.
Now, a question for Jon:
Normally that 12 volts to the logic on pin 6 will be present anytime
the interfaces line cord is plugged in, and which I intend
eventually to plug into the power strip that feeds the rest of the
motor power box. So it will come on with all the stepper drivers,
but spindle power is soft started by enabling the machine from F2,
takes 3 seconds to get full power. And I don't trip a 30 amp
breaker charging the supplies caps.
But is it safe to apply the high voltage motor power to the
pwm-servo amp IF for some reason the interface is powerless and its
12 volt supply is off. This will put full motor power at pins-1-2,
with no logic power on pin 6.
Is that safe, or will it let some smoke out and kill all the local
kittens? I could rig a relay, or better yet, move the SSR +
terminals to the 12 volt supply, better yet disable that in hal if
the 12 volts isn't there by changing the sserial com mode so it will
send an a/d output back to lcnc. Thats slower of course but I'll
check it out.
Thanks Jon.
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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