On 03/10/2015 09:09 AM, Neil wrote:
>
> On 3/10/2015 10:39 AM, jrmitchellj . wrote:
>> A couple more neatness thoughts.
... snip
> I was tinkering with this yesterday... currently the step signals idle
> high ( so the optos on the IM483s are off), and pulse low. But I do
> need to research the timing requirements of the IM483s.
From your picture, it looks like you are using software stepping. This
page has some timing data ("find im483"):
http://wiki.linuxcnc.org/cgi-bin/wiki.pl?Stepper_Drive_Timing
The IM483 is much faster than software stepping so you will be limited
to the base period. If I recall correctly, any timing settings you make
will most likely be bumped up to your base period. You can check this by
invoking "halcmd show" or "halcmd show | grep what-im-looking-for" and
look for the timing parameters. They will likely match your base value
rather than any value you set in your .ini file.
With software stepping, micro-stepping should be limited to 1/4 or 1/8
stepping.
It looks like the drive needs 12 to 48 volts. The higher the better, but
be sure to study and set the current limit resistor.
http://motion.schneider-electric.com/products/im483.html
>> In many of my builds, I use sacrificed CAT5 cables that I strip off
>> the sheath and use the twisted pairs for internal signal wiring. The
>> twists are very uniform for the very reason of keeping adjacent
>> signals out.
I have also had good luck with Cat5 pairs.
> I do have to rewire and clean up properly. I have some slotted wire
> duct ( http://www.mcmaster.com/#7578K41 ) but space is too tight in some
> areas to even mount this. I have a bit of room to slide the mobo over
> so I can mount the duct between the mobo and IM483s.
Actually, messy wiring can be better. Wires that run parallel will have
more cross talk.
--
Kirk Wallace
http://www.wallacecompany.com/machine_shop/
http://www.wallacecompany.com/E45/
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