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Set up using AMC AB15A100 drives, brushed DC motor Prototrak Plus with Encoders
- Todd Zuercher
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13 Sep 2022 16:29 #251822
by Todd Zuercher
Replied by Todd Zuercher on topic Set up using AMC AB15A100 drives, brushed DC motor Prototrak Plus with Encoders
I think you may have adjusted FF1 in the wrong direction. (A negative error on a negative direction move is the same as a positive error with a positive move.)
As to starting with the Y, I don't think I'd start with the X settings, but something a little more conservative. Maybe half the P and D. FF1 and FF2 will be question marks. I don't think they will be the same as X.
I'd set set the deadband = 0.00005 instead of 0.000001.
As to starting with the Y, I don't think I'd start with the X settings, but something a little more conservative. Maybe half the P and D. FF1 and FF2 will be question marks. I don't think they will be the same as X.
I'd set set the deadband = 0.00005 instead of 0.000001.
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13 Sep 2022 16:51 #251825
by new2linux
Replied by new2linux on topic Set up using AMC AB15A100 drives, brushed DC motor Prototrak Plus with Encoders
Todd, This pics are of DeadBand only. The error looks lower with DeadBand=.00001, that was the reason.
I set .ini MAX_Acceleration to 1.2 from 2.5 for "Y" axes.
Many thanks.
I set .ini MAX_Acceleration to 1.2 from 2.5 for "Y" axes.
Many thanks.
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13 Sep 2022 17:13 #251828
by Todd Zuercher
Replied by Todd Zuercher on topic Set up using AMC AB15A100 drives, brushed DC motor Prototrak Plus with Encoders
Setting it to less than one encoder count also doesn't quiet the at rest dither either. Notice the little bumps in the output and error before you begin your move. Usually the small loss of precision (one encoder count) is more than made up for by the resulting smoother operation.
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13 Sep 2022 17:53 #251832
by new2linux
Replied by new2linux on topic Set up using AMC AB15A100 drives, brushed DC motor Prototrak Plus with Encoders
Todd, thanks! I have tried several trace settings, I see the bumps you talk of, the DeadBand .00005 is the minimum setting, any less does nothing for trace. The attached pic has slightly more error, (total around .0007", add the top & bottom maximums), if this is correct I am ok with that.
I worked some on the "y", nothing to show.
Many thanks!
I worked some on the "y", nothing to show.
Many thanks!
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13 Sep 2022 18:10 #251833
by Todd Zuercher
Replied by Todd Zuercher on topic Set up using AMC AB15A100 drives, brushed DC motor Prototrak Plus with Encoders
What does setting FF1=2.11 look like?
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13 Sep 2022 18:23 #251834
by new2linux
Replied by new2linux on topic Set up using AMC AB15A100 drives, brushed DC motor Prototrak Plus with Encoders
Todd, thanks. This is the trace you asked about. It does look nice.
Many thanks.
Many thanks.
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13 Sep 2022 18:51 #251837
by Todd Zuercher
Replied by Todd Zuercher on topic Set up using AMC AB15A100 drives, brushed DC motor Prototrak Plus with Encoders
Didn't change enough, try FF1=2.12.
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13 Sep 2022 19:11 #251838
by new2linux
Replied by new2linux on topic Set up using AMC AB15A100 drives, brushed DC motor Prototrak Plus with Encoders
Todd, thanks! Attached are a pic of before & after, I have not studied them.
Many thanks.
Many thanks.
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13 Sep 2022 19:18 #251839
by new2linux
Replied by new2linux on topic Set up using AMC AB15A100 drives, brushed DC motor Prototrak Plus with Encoders
Todd, This is the 1st pics of the "Y" axes, I'm looking for suggestions. The .hal Max_Acceleration is at 2.5 (same as x axes).
Many thanks.
Many thanks.
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13 Sep 2022 19:31 #251840
by Todd Zuercher
Replied by Todd Zuercher on topic Set up using AMC AB15A100 drives, brushed DC motor Prototrak Plus with Encoders
Are you sure the acceleration is set to to.2.5? It doesn't look like it is. (Don't forget you have to shutdown Linuxcnc, edit and save, then restart Linuxcnc before edits to the ini file take effect.
Are you sure you changed all of the correct lines to change the acceleration of the Y-axis?
(Otherwise it looks like the Y could use more FF1.)
Are you sure you changed all of the correct lines to change the acceleration of the Y-axis?
(Otherwise it looks like the Y could use more FF1.)
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- Set up using AMC AB15A100 drives, brushed DC motor Prototrak Plus with Encoders
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