IHSS57-36 with 7i92 don't move

i'm a bit at a loss here. granted, i'm a noob, so what else to expect ¯\_(ツ)_/¯

short intro: i'm trying to retrofit an early 90ies Newing Hall engraving machine (x/y table with pneumatic solenoid tool) with some modern controller, tinkered with a smoothieboard/smoothieware yet but figured i could as well get a bit more knowledge and gain more flexibility by using linuxcnc.

researching over the last year i decided to 'go FPGA' right from the start, and i'm rather confident that i understand the concept enough to do it - but still i lack lot's of basics. also the motors seem to be (judging from search results on this forum) rather exotic which makes it hard for a beginner.

before getting into details of wiring/hal/configs may i just describe the symptoms i get - maybe that tells enough:
everything's powered, connected, starting linuxcnc/axis gui i try to jog a motor. but it doesn't move - it just "spits" what feels like a single step (or not much more) at the end of the commanded movement. and no matter if clicking + or - it's always the same direction.

i'm currently trying to make sure that the wiring really is correct as it somehow looks to me like this could be it - but even trial and error didn't change anything so far.

any idea what i might be missing?

tia,
markus.



 

Wiring and timing, set timings to at least 5000 both for step and 20000 both for dir.
Those are located in the .ini file with the same name as the config folder.

In addition to timing, how is the 7I92 wired to the drives?

tommylight wrote:

Wiring and timing, set timings to at least 5000 both for step and 20000 both for dir.
 

these were my suspects for the last couple of weeks yet, but trying anything i could think of - i just couldn't get any different result so far.

i'll post my current state when i'm back at the workshop and verified the pinout from fpga-level.

thanks, markus.

"it just "spits" what feels like a single step (or not much more) at the end of the commanded movement. and no matter if clicking + or - it's always the same direction"

This sounds a lot like step/dir being swapped...

Also if you are using a 7I92 without a breakout board
there is really only one type of connection that makes
sense: +5V to drives STEP+ and DIR+, Drives STEP-
and DIR- to 7I92 step/dir pins. And then set the step
polarity to active low.

Note that I do not recommend connecting motor drives directly
tp the 7I92 but it can be done if you are careful no only connect
the 7I92 IO pins to OPTO isolated signals

PCW wrote:

"it just "spits" what feels like a single step (or not much more) at the end of the commanded movement. and no matter if clicking + or - it's always the same direction"

This sounds a lot like step/dir being swapped...

this sir was the simple answer i had hoped for. image missing /media/kunena/emoticons/grin.png seems from all the trials and errors i've been through this somehow slipped my tests.. now that you said it i checked the fpga-pins and lo and behold it says 'Dir' for 1/2 where i had it hooked on the motors 'Step' pins.. we're moving now. 

Also if you are using a 7I92 without a breakout board
there is really only one type of connection that makes
sense: +5V to drives STEP+ and DIR+, Drives STEP-
and DIR- to 7I92 step/dir pins. And then set the step
polarity to active low.

why's that? i think to remember to have read differently in other places for reasons i can't recall - and it's working now with directly connecting as designated. if doing it the way you suggest - where would i set the 'step polarity to active low'?

Note that I do not recommend connecting motor drives directly
tp the 7I92 but it can be done if you are careful no only connect
the 7I92 IO pins to OPTO isolated signals

that's what i came to understand in the meantime - that the 7i92 only seems to be meant as a 'gateway' between computer and other mesa-cards. interpreting your suggestion with my basic electronics knowledge i assume you mean to protect the mesa-card from currents flowing back from the machine/motors, right? not sure how likely this could happen with my rather 'light' machine, but i'll keep it in mind.


another basic question: using these motors with it's integrated controllers this way it isn't 'closed loop' - right? 

thanks,
markus.