On Sat, 23 Feb 2019, Gene Heskett wrote:
Date: Sat, 23 Feb 2019 15:30:48 -0500
From: Gene Heskett <ghesk...@shentel.net>
Reply-To: "Enhanced Machine Controller (EMC)"
<emc-users@lists.sourceforge.net>
To: emc-users@lists.sourceforge.net
Subject: Re: [Emc-users] New discovery for 5i25-7i76 users.
On Saturday 23 February 2019 12:00:21 Peter C. Wallace wrote:
On Sat, 23 Feb 2019, Gene Heskett wrote:
Date: Sat, 23 Feb 2019 11:47:48 -0500
From: Gene Heskett <ghesk...@shentel.net>
Reply-To: "Enhanced Machine Controller (EMC)"
<emc-users@lists.sourceforge.net>
To: emc-users@lists.sourceforge.net
Subject: Re: [Emc-users] New discovery for 5i25-7i76 users.
On Saturday 23 February 2019 11:02:36 Peter C. Wallace wrote:
On Sat, 23 Feb 2019, Gene Heskett wrote:
Date: Sat, 23 Feb 2019 08:35:08 -0500
From: Gene Heskett <ghesk...@shentel.net>
Reply-To: "Enhanced Machine Controller (EMC)"
<emc-users@lists.sourceforge.net>
To: emc-users@lists.sourceforge.net
Subject: [Emc-users] New discovery for 5i25-7i76 users.
Greetings PCW;
According to what I am seeing with a halmeter, the 7i76 completely
replaces any need for a pwmgen to be included in the hm2 config
line of the hal file, thereby simplifying ones hal file by quite a
few lines.
However, with a vfd to control, it appears there are 3 parameters
to be added and serviced with setp's:
hm2_5i25.0.7i76.0.0.spinout-maxlim
hm2_5i25.0.7i76.0.0.spinout-minlim
hm2_5i25.0.7i76.0.0.spinout-scalemax
However this does not disable the spindle if the requested speed
is below minlim. Shouldn't it?
No, it just bounds the input range
For a typical use you would set
hm2_5i25.0.7i76.0.0.spinout-maxlim to maximum spindle RPM
hm2_5i25.0.7i76.0.0.spinout-minlim to 0 or some minimum spindle
RPM hm2_5i25.0.7i76.0.0.spinout-scalemax to maximum spindle RPM
Set for 24000 max's, and 2400 min, it will still tell the spindle to
run at 1 rpm. Or from the mdi cli s2m3 still tries to run it, at 2
rpm. So obviously I've not got it net'd correctly.
This is what I have:
#setup spindle driver
# NOTE no pwmgen in the 5i25 is used!
net spindle-cmd <= spindle.0.speed-out
net spindle-cmd => abs.1.in
net spindle-abs <= abs.1.out => hm2_5i25.0.7i76.0.0.spinout
setp hm2_5i25.0.7i76.0.0.spinout-maxlim [SPINDLE_0]MAXREV_LIM
#24000 setp hm2_5i25.0.7i76.0.0.spinout-minlim
[SPINDLE_0]MINREV_LIM #2400 setp
hm2_5i25.0.7i76.0.0.spinout-scalemax [SPINDLE_0]MAXREV_LIM #24000
net spindle-enable <= spindle.0.on
net spindle-enable => hm2_5i25.0.7i76.0.0.spinena
net spindle-ccw <= spindle.0.reverse =>
hm2_5i25.0.7i76.0.0.spindir
I'd appreciate some guidance in setting those intelligently.
At first glance it looks like scalemax and maxlim should be the
same and equal to the spindles top speed of 24000 revs, and I'm
guessing that minlim should be around 2400 in order to protect the
spindle and vfd from an over-exuberance of low speed torque
boosting over drive. Then one could S command speeds directly in
rpms.
How far off am I?
That sounds right
Ok. I'll leave it there. But its not setting a minimum speed below
which it is stopped. The vfd may have its own limit that I've not
found yet. This vfd is best described as a bastard due to the lack
of engrish docs. Google translate does a decent job, but only does
the first 40 pages of a 65 page manual. It dies at about the point
where it gets interesting...
Thanks Peter.
Cheers, Gene Heskett
Thats correct, minlim wil bound the setting but does not disable the
spindle
What does it actually limit then? spinout happily follows the s command down
to 1. I have that area of the tach marked red, but that doesn't protect the
motor either.
It limits the analog output
It cannot cannot be set below minlim
Though if the spindle is disabled (spinena false) the analog out will be 0
And I've not figured out how to extract the vfd's tach display unless I do
it optically, with an encoder so my pretty tach display sits at zero. Sniff.
I think the vfd outputs an analog voltage someplace but thats a bridge not
yet crossed. It can report the rpms on its own display.
Page 14 of your doc say I can read what the vfd supplies but not terribly
accurately, the first 4 field inputs.
The vfd has an empty space where an rj45 could be planted, so I've no clue if a
rs-485 receiver could obtain anything usefull or not. It does show registers to
set up a serial link in the chinglish docs.
Thanks Peter. I think I'll go see if I can make the spindle run now. But 2 hours later,
making cables etc, no luck. I need to get it laying where I can get at the programming
conntrols at the same time as I can fiddle with the wires on the interface strip,
opening up this #@%& can of worms is a PITA. The main stuff is all mounted on the
bottom plate, but none of the cabling reaching to its line cord entry, or to the
control panel mounted in the tops slopeing front, is long enough to actually let you
lay the cover someplace where the programming panel is even seeable, let alone useable.
Best described as a PIMA. Probably the best way is to knock tha panel out of the case
(looks like its glued into the square hole) and lay it someplace it won't short to
anything. Or even make a new box. This one is heavy steel & probably weighs 30 lbs
empty!
Later... Thanks.
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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