encoder on step/dir system
07 Sep 2016 16:12 #80127
by steva
encoder on step/dir system was created by steva
Hello,
I have a configuration of the servo motor in position loop ( step / dir ) .
I connected servo drive encoder output to Mesa 7i77 encoder input.
I want to compare encoder.xx.position and axis.x.joint-pos-cmd.
I would like to receive a warning when the difference exceeds a certain predetermined level ( something like the following error ) .
Does anyone have something like this ?
I have a configuration of the servo motor in position loop ( step / dir ) .
I connected servo drive encoder output to Mesa 7i77 encoder input.
I want to compare encoder.xx.position and axis.x.joint-pos-cmd.
I would like to receive a warning when the difference exceeds a certain predetermined level ( something like the following error ) .
Does anyone have something like this ?
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07 Sep 2016 17:03 #80135
by bkt
Replied by bkt on topic encoder on step/dir system
I'm not an expert but is possible to connect step/dir signal to mesa 7i77?
anyhow following error depends on Ferror parameter, if you have ferror parameter too little you obtain following error .... LCNC control step/dir by mesa 7i77 or by other input ??
Regards
Giorgio
anyhow following error depends on Ferror parameter, if you have ferror parameter too little you obtain following error .... LCNC control step/dir by mesa 7i77 or by other input ??
Regards
Giorgio
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07 Sep 2016 20:27 #80170
by andypugh
LinuxCNC already does this for you. All you need is for your HAL to connect the encoder feedback to axis.N.position-cmd-fb
However, it doesn't really want you, it stops all motion and turns the machine off.
If you want a pre-warning, then the HAL "wcomp" component can help. Possibly combined with the HAL "message" component.
Is that enough? Just ask, if not.
Replied by andypugh on topic encoder on step/dir system
I want to compare encoder.xx.position and axis.x.joint-pos-cmd.
LinuxCNC already does this for you. All you need is for your HAL to connect the encoder feedback to axis.N.position-cmd-fb
However, it doesn't really want you, it stops all motion and turns the machine off.
If you want a pre-warning, then the HAL "wcomp" component can help. Possibly combined with the HAL "message" component.
Is that enough? Just ask, if not.
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08 Sep 2016 07:29 #80209
by steva
Replied by steva on topic encoder on step/dir system
I can not find "axis.N.position-cmd-fb".
My fb signal in Axis is already used:
net x-pos-fb <= hm2_5i25.0.stepgen.00.position-fb => axis.0.motor-pos-fb
My fb signal in Axis is already used:
net x-pos-fb <= hm2_5i25.0.stepgen.00.position-fb => axis.0.motor-pos-fb
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08 Sep 2016 08:30 #80210
by andypugh
Replied by andypugh on topic encoder on step/dir system
Sorry. That's the pin.
I was working from memory (I am working inTurkry, a long way from my CNC machines)
I was working from memory (I am working inTurkry, a long way from my CNC machines)
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