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Prototrak Plus Retrofit with Mesa 7i77 & 5i25 cards
- Todd Zuercher
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08 May 2017 18:32 #92857
by Todd Zuercher
Oops, I saw the 200m/div for the vel-cmd and thought that was the scale for the following error. In that case it wasn't that bad.
Replied by Todd Zuercher on topic Prototrak Plus Retrofit with Mesa 7i77 & 5i25 cards
It is showing nearly a 1 inch following error during the acceleration phase of the move.
Isn't that 6 milli-inches? Or am I misunderstanding?
(I had been interpreting it as microns, and thinking it looked quite good)
Oops, I saw the 200m/div for the vel-cmd and thought that was the scale for the following error. In that case it wasn't that bad.
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08 May 2017 18:40 #92858
by new2linux
Replied by new2linux on topic Prototrak Plus Retrofit with Mesa 7i77 & 5i25 cards
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08 May 2017 20:06 #92873
by Todd Zuercher
Replied by Todd Zuercher on topic Prototrak Plus Retrofit with Mesa 7i77 & 5i25 cards
Try setting your max_acceleration to 8 or 10, (and I think you might be able to set the max_velocity a bit higher try 1 or 2).
What does more FF2 do?
What does more FF2 do?
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08 May 2017 21:19 #92877
by new2linux
Replied by new2linux on topic Prototrak Plus Retrofit with Mesa 7i77 & 5i25 cards
Many thanks, Todd! The f.error is best yet.
Attached are a few pics and .ini file, read file name for description of trace.
many, many thanks to all that have been part of this project!
Attached are a few pics and .ini file, read file name for description of trace.
many, many thanks to all that have been part of this project!
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08 May 2017 23:07 - 08 May 2017 23:11 #92881
by new2linux
Replied by new2linux on topic Prototrak Plus Retrofit with Mesa 7i77 & 5i25 cards
Many thanks!
Attached are a few pics of hal trace after ini file max- vel go from 1.0 (in prior post) to 1.5 and then to 2.0, read file name.
Edit: This is the best f.error setting,(the gain is set very high!) : forum.linuxcnc.org/media/kunena/attachme...00003_2017-05-08.png
The f.error is lower than ever!
Many, many thanks!
Attached are a few pics of hal trace after ini file max- vel go from 1.0 (in prior post) to 1.5 and then to 2.0, read file name.
Edit: This is the best f.error setting,(the gain is set very high!) : forum.linuxcnc.org/media/kunena/attachme...00003_2017-05-08.png
The f.error is lower than ever!
Many, many thanks!
Last edit: 08 May 2017 23:11 by new2linux.
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09 May 2017 12:26 #92914
by new2linux
Replied by new2linux on topic Prototrak Plus Retrofit with Mesa 7i77 & 5i25 cards
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09 May 2017 12:42 #92918
by Todd Zuercher
Replied by Todd Zuercher on topic Prototrak Plus Retrofit with Mesa 7i77 & 5i25 cards
In this image forum.linuxcnc.org/media/kunena/attachme...iniacc10.0vel1.0.png you were able to invert the following error spike during acceleration. This tells us that you should be able to almost completely zero it out by finding just the right amount of FF2 to apply.
It looks like you will eventually find a very well tuned set up. Don't be afraid to experiment with higher maximum velocities. You may find that you can achieve as high or maybe even slightly higher rapid travel rates than you had with the original control. The limit will be the maximum voltage of your servo power supply. The limit for your max acceleration is the maximum current your servo drives can supply. It is probably best to leave a little headroom here because under load the current needed will be higher (In other words, it won't be able to accelerate as fast under load.)
It looks like you will eventually find a very well tuned set up. Don't be afraid to experiment with higher maximum velocities. You may find that you can achieve as high or maybe even slightly higher rapid travel rates than you had with the original control. The limit will be the maximum voltage of your servo power supply. The limit for your max acceleration is the maximum current your servo drives can supply. It is probably best to leave a little headroom here because under load the current needed will be higher (In other words, it won't be able to accelerate as fast under load.)
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11 May 2017 13:04 #93023
by new2linux
Replied by new2linux on topic Prototrak Plus Retrofit with Mesa 7i77 & 5i25 cards
Todd, many thanks for all your help!
Attached are a few pics of the best yet of x and y axes traces. The max acceleration helped a great deal, will post .ini file next time. How do the axes trace look, both are the same "gain" scale, the f.error I can move/shift the 0.0 of the trace, but not having a lot of luck reducing the spike. The trace will vary about 1/10th of the scale w/o changing any settings, just push jog again.
Many thanks! Your comments/suggestions are warmly welcomed.
Attached are a few pics of the best yet of x and y axes traces. The max acceleration helped a great deal, will post .ini file next time. How do the axes trace look, both are the same "gain" scale, the f.error I can move/shift the 0.0 of the trace, but not having a lot of luck reducing the spike. The trace will vary about 1/10th of the scale w/o changing any settings, just push jog again.
Many thanks! Your comments/suggestions are warmly welcomed.
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11 May 2017 13:18 #93024
by Todd Zuercher
Replied by Todd Zuercher on topic Prototrak Plus Retrofit with Mesa 7i77 & 5i25 cards
What happens to the spike, with FF2 set to about 1 for the X axis and about 0.1 for the Y?
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11 May 2017 15:02 - 11 May 2017 15:05 #93027
by new2linux
Replied by new2linux on topic Prototrak Plus Retrofit with Mesa 7i77 & 5i25 cards
Last edit: 11 May 2017 15:05 by new2linux. Reason: clearify
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