On Sun, 3 Feb 2019, Gene Heskett wrote:
Date: Sun, 3 Feb 2019 07:16:13 -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 Sunday 03 February 2019 01:19:26 Peter C. Wallace wrote:
On Sat, 2 Feb 2019, Gene Heskett wrote:
> Date: Sat, 2 Feb 2019 21:46:24 -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 Saturday 02 February 2019 19:51:18 Peter C. Wallace wrote:
>
> On Sat, 2 Feb 2019, Gene Heskett wrote:
> > Date: Sat, 2 Feb 2019 19:01:59 -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 Saturday 02 February 2019 16:00:04 Andy Pugh wrote:
> > > On 2 Feb 2019, at 18:13, Gene Heskett <ghesk...@shentel.net>
> > > wrote:
> > >
> > > But whats the range of spindle speed requests that are valid in
> > > that case.
> >
> > Approx -1.8 x 10^308 to +1.8 x 10^308
> >
> > Because it????????s a double precision floating point.
> >
> > Are you reading the 7i76 manual or just the LinuxCNC docs?
>
> The 7i76 manual lacks anything like such an explanation for the
> spindle functions. Or has it been expanded and corrected?, I've had
> the doc file I am looking at for about 3 months now.
>
> Thanks Andy.
I just read it again, top to bottom and back up. None of this stuff is
in it, nor is there any reference to reading the manpage for sserial.
> The sserial man page has some info about the 7i76 pins
So it does, but haveing no reference to it in the doc, I hadn't read
it until now. It also states theres a high likelyhood of its being
permanently out of date. And it makes zero mention that ENA and DIR
appear to be activated ONLY when when spinout has valid non-zero data.
That might work for a vfd but not for a pwm-servo such as Jon sells.
The way its worded, ENA and DIR appear to be straight thru from input
to output isolated controls, which would make them 100% useful. But
because they aren't activated until spinout has valid non-zero data,
the ENA is of zero use to me. That amp must be enabled, then pulsed to
charge the gates properly before the data from the pid.out arrives at
the pwmgen.1.value pin to start its generation of pulses. I do have a
method worked out that should work, using the otherwise mounted for
its looks, relay on the SainSmart BoB. Driven by p2 of the 5i25 using
a special bitfile Peter sent me which puts a 2nd pwmgen on the P2
connector since the first one goes to /dev/null in the 7i76d. I may be
able to get that wired up tomorrow, but I am making all this hookup
hardware as I go. From a 150 foot spool of wire, and a bag of GS12-5
connectors. Darned near too small for these getting a little shaky old
hands.
Thats not quite true, The 7I76 DIR output is a completely independent
output bit and ENA must be present for the analog output to work, that
is analog out is dependent on ENA but not the other way around.
I did not find that in my testing, Peter. Neither ENA- was pulled up to
the +12 volts on ENA+, nor was DIR- pulled up to the +5 volts on DIR+,
until I gave it a non-zero spinout. In my testing, no power was applied
to tb4,1-3 because the intent is to use the 2nd pwmgen as the input to
jon's servo amp in this instant build. I will use it with the vfd in the
6040 build that I bought the 2nd 7i76d for. So I was forced to use the
relay on a sainsmart bob to switch the ena to the pwm-servo amp and use
a timedelay module to delay everything else until the relay was solidly
closed.
Is there some other magic I missed? Humm, maybe, I had not learned about
the params that needed set according to "man 9 sserial" until yesterday.
IMO, this should have been mentioned in the downloadable doc for the
7i76 but is not. They now are being set, so I'll retest and advise
today.
Those aren't accessible to a halmeter, so I have to use a dvm (or a
scope) to verify. And I was reading a wandering 60 millivolts to ground
at those terminals.
Thanks Peter.
The 7I76 spindle ENA and DIR outputs are independent of the analog value
of spinout, (though the analog out is forced to 0 if spinena is false)
is it possible you have a wiring error?
Peter Wallace
Mesa Electronics
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Cheers, Gene Heskett
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Peter Wallace
Mesa Electronics
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