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why spindle speed is dropping?

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24 Dec 2012 02:27 - 24 Dec 2012 02:38 #27985 by viski
why spindle speed is dropping? was created by viski
Lathe config in made with PnCConf and spindle speed. At now it is in open loop but i am going to made closed loop spindle with gear reduction.

Mesa m5i20 + 7i33TA analog output card

Why does it dropping ?
Last edit: 24 Dec 2012 02:38 by viski.

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24 Dec 2012 02:33 #27986 by PCW
Replied by PCW on topic why spindle speed is dropping?
Can you explain a little more what you mean by 'dropping' ?

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24 Dec 2012 02:50 #27987 by viski
Replied by viski on topic why spindle speed is dropping?

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24 Dec 2012 03:18 #27988 by PCW
Replied by PCW on topic why spindle speed is dropping?
Can you check the analog output voltage of the 7I33 channel you are using for the spindle?

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24 Dec 2012 03:49 #27989 by viski
Replied by viski on topic why spindle speed is dropping?
Yes ,i can.
I will do it tommorow.

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26 Dec 2012 21:40 #28043 by viski
Replied by viski on topic why spindle speed is dropping?
problem solved :). encoder.counter-mode set to 1 ( true) and it work.

Now , how to make 0- 10 V output for spindle controll from 0 - 1600 rpm ?

my hal file


File Attachment:

File Name: Max_Muller.hal
File Size:9 KB
Attachments:

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26 Dec 2012 23:41 #28044 by PCW
Replied by PCW on topic why spindle speed is dropping?
This should be done by setting the pwm scale of the pwmgen that drives the spindle output to 1600
I expect this is done in this line:

setp hm2_5i20.0.pwmgen.03.scale [SPINDLE_9]OUTPUT_SCALE

but you would have to check your .ini file to see if [SPINDLE_9]OUTPUT_SCALE is set

(or look at hm2_5i20.0.pwmgen.03.scale with halmeter)

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27 Dec 2012 02:23 #28055 by viski
Replied by viski on topic why spindle speed is dropping?
pwm.output-type 3 ( PDM ) . I need absolute 0- 10 v output . At now when i run m3 i get positive output but with m4 i get negative output. How to solve this problem?

When machine is not enabled ,speendle speed is correct. When i turn machine ON speendle speed is growing :S
What should be wrong?

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27 Dec 2012 03:03 #28058 by PCW
Replied by PCW on topic why spindle speed is dropping?
spindle-vel-cmd needs to be run through an abs component for 0 to +10 spindles

the indicated velocity growth might have something to do with the lowpass filter. The actual spindle should be disabled with machine off

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27 Dec 2012 20:01 #28084 by viski
Replied by viski on topic why spindle speed is dropping?
Pid feedback spindle is working :).

Any ideas how to add abs comp to get 0-10 Volt output always?
If i add abs.0.out after sum2.0.out i get error mesage: ' spindle-vel-cmd allready has an output sum2.0.out pin! '

How can i solve problem?


File Attachment:

File Name: Max_Muller...2-27.hal
File Size:10 KB
Attachments:

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  1. Configuring LinuxCNC
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