EMC Fix Ideas
Posted by
Ozzie@h...
on 2000-09-03 16:37:13 UTC
A while back I posted my problems with getting my CNC setup to work,
under Lost steps.
Many thought that my problem was with electrical noise, that the
wiring of my Camtronics driver was at fault, etc.
I then discovered, with some help from Alan Rothenbush, that CNCPRO
worked almost flawlessly.
My problem is that I really want to use a closed loop system, (EMC
with the Mauch DRO card). I already have the card and motors with
encoders are on the way.
Toward that end and any possibility that my Camtronics board was
wired
in less than an exemplary way, I pulled all the wires and re-wired.
All 37 volt wires are 14 ga twisted pairs, all 5 volt wires are 18 ga
twisted pairs, all signal wires are 22 ga , signal twisted with a
ground, direction twisted with a ground, all motor wires are 18ga, Aa
twisted and Bb twisted. The wire motors from the case are shielded
and
grounded. ALL grounds run to the big capacitor, no exceptions! It's
beautifull!
But the results are the same; CNCPRO will execute twenty moves at
virtually any speed, and return to it's start point within a half
thou
on a cheap dial indicator. EMC will not do two moves within .005".
The last time I posted the problem the discussion wandered to what
should be done to improve EMC, and that is fine. But, there must be
many out there using EMC on a small setup like mine with success.
Although Tim Goldstein setup my EMC, (and by the way posted my
setup),
I'm wondering what areas of the ini files I might try changing to
make
things work for me now rather when an improvement for EMC comes along.
*****Please bear in mind that the problems are at slow speeds, well
under 1000 steps per second. Higher speeds work fine!**** I think
that eliminates acceleration or velocity settings, (although I have
tried changing them both, to no improvement).
I understand that the closed loop will probably cure the problem,
maybe the new motors will, but I have a feeling that I should make it
work as well as possible before adding to the hardware.
Looking for ideas,
Thanks Jerry
under Lost steps.
Many thought that my problem was with electrical noise, that the
wiring of my Camtronics driver was at fault, etc.
I then discovered, with some help from Alan Rothenbush, that CNCPRO
worked almost flawlessly.
My problem is that I really want to use a closed loop system, (EMC
with the Mauch DRO card). I already have the card and motors with
encoders are on the way.
Toward that end and any possibility that my Camtronics board was
wired
in less than an exemplary way, I pulled all the wires and re-wired.
All 37 volt wires are 14 ga twisted pairs, all 5 volt wires are 18 ga
twisted pairs, all signal wires are 22 ga , signal twisted with a
ground, direction twisted with a ground, all motor wires are 18ga, Aa
twisted and Bb twisted. The wire motors from the case are shielded
and
grounded. ALL grounds run to the big capacitor, no exceptions! It's
beautifull!
But the results are the same; CNCPRO will execute twenty moves at
virtually any speed, and return to it's start point within a half
thou
on a cheap dial indicator. EMC will not do two moves within .005".
The last time I posted the problem the discussion wandered to what
should be done to improve EMC, and that is fine. But, there must be
many out there using EMC on a small setup like mine with success.
Although Tim Goldstein setup my EMC, (and by the way posted my
setup),
I'm wondering what areas of the ini files I might try changing to
make
things work for me now rather when an improvement for EMC comes along.
*****Please bear in mind that the problems are at slow speeds, well
under 1000 steps per second. Higher speeds work fine!**** I think
that eliminates acceleration or velocity settings, (although I have
tried changing them both, to no improvement).
I understand that the closed loop will probably cure the problem,
maybe the new motors will, but I have a feeling that I should make it
work as well as possible before adding to the hardware.
Looking for ideas,
Thanks Jerry