Mesa 5i25 and 7i76 and encoder

  • finemeca
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10 years 1 month ago #80347 by finemeca
Replied by finemeca on topic Mesa 5i25 and 7i76 and encoder
OK thanks.
I check tomorrow

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10 years 1 month ago #80495 by finemeca
Replied by finemeca on topic Mesa 5i25 and 7i76 and encoder
Hello,

I redo my tests ....

With M3 s00: motion.spindle-at-speed true
With M3 s300: motion.spindle-at-speed false


An inversion problem?
What reverse signal ?

@pierre

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10 years 1 month ago #80497 by jtc
Replied by jtc on topic Mesa 5i25 and 7i76 and encoder
I think that at 0 speed the spindle ate speed is always true...

see this example:

linuxcnc.org/docs/html/examples/spindle.html

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10 years 1 month ago #80866 by finemeca
Replied by finemeca on topic Mesa 5i25 and 7i76 and encoder
Hello,

I always have the problem?

An idea ?

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10 years 1 month ago #80867 by PCW
Replied by PCW on topic Mesa 5i25 and 7i76 and encoder
if spindle-at-speed is not true, it means spindle-vel-fb is not "near" spindle-vel-cmd-rps (within 200 RPM)

To debug, halmeter or watch both when you have 300 RPM selected, they should both be around 5 ( 5 RPS = 300 RPM )

This error suggests that either the spindle encoder is not working, is backwards, or is scaled wrong
or the spindle speed command path has an error (you dont get 300 RPM when you request it)

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10 years 1 month ago #80901 by finemeca
Replied by finemeca on topic Mesa 5i25 and 7i76 and encoder
Hello PCW

Here is a piece of my hall file :

Code:
#******************* # SPINDLE S #******************* setp pid.s.Pgain [SPINDLE_9]P setp pid.s.Igain [SPINDLE_9]I setp pid.s.Dgain [SPINDLE_9]D setp pid.s.bias [SPINDLE_9]BIAS setp pid.s.FF0 [SPINDLE_9]FF0 setp pid.s.FF1 [SPINDLE_9]FF1 setp pid.s.FF2 [SPINDLE_9]FF2 setp pid.s.deadband [SPINDLE_9]DEADBAND setp pid.s.maxoutput [SPINDLE_9]MAX_OUTPUT setp pid.s.error-previous-target true net spindle-index-enable <=> pid.s.index-enable net spindle-enable => pid.s.enable net spindle-vel-cmd-rpm-abs => pid.s.command net spindle-vel-fb-rpm-abs => pid.s.feedback net spindle-output <= pid.s.output # ---digital potentionmeter output signals/setup--- setp hm2_5i25.0.7i76.0.0.spinout-minlim [SPINDLE_9]OUTPUT_MIN_LIMIT setp hm2_5i25.0.7i76.0.0.spinout-maxlim [SPINDLE_9]OUTPUT_MAX_LIMIT setp hm2_5i25.0.7i76.0.0.spinout-scalemax [SPINDLE_9]OUTPUT_SCALE net spindle-vel-cmd-rpm-abs => hm2_5i25.0.7i76.0.0.spinout net spindle-enable => hm2_5i25.0.7i76.0.0.spinena net spindle-ccw => hm2_5i25.0.7i76.0.0.spindir # ---setup spindle control signals--- net spindle-vel-cmd-rps <= motion.spindle-speed-out-rps net spindle-vel-cmd-rps-abs <= motion.spindle-speed-out-rps-abs net spindle-vel-cmd-rpm <= motion.spindle-speed-out net spindle-vel-cmd-rpm-abs <= motion.spindle-speed-out-abs net spindle-enable <= motion.spindle-on net spindle-cw <= motion.spindle-forward net spindle-ccw <= motion.spindle-reverse #net spindle-brake <= motion.spindle-brake net spindle-revs => motion.spindle-revs net spindle-at-speed => motion.spindle-at-speed net spindle-vel-fb-rps => motion.spindle-speed-in net spindle-index-enable <=> motion.spindle-index-enable # ---Setup spindle at speed signals--- sets spindle-at-speed true # ---Setup spindle at speed signals--- net spindle-vel-cmd-rps => near.0.in1 net spindle-vel-fb => near.0.in2 net spindle-at-speed <= near.0.out setp near.0.scale 1.000000 setp near.0.difference 3.333333 # Spindle encoder # ---------------- # ---Encoder feedback signals/setup--- setp hm2_5i25.0.encoder.00.counter-mode 1 setp hm2_5i25.0.encoder.00.filter 1 setp hm2_5i25.0.encoder.00.index-invert 0 setp hm2_5i25.0.encoder.00.index-mask 0 setp hm2_5i25.0.encoder.00.index-mask-invert 0 setp hm2_5i25.0.encoder.00.scale 100 net spindle-revs <= hm2_5i25.0.encoder.00.position net spindle-vel-fb <= hm2_5i25.0.encoder.00.velocity net spindle-index-enable <=> hm2_5i25.0.encoder.00.index-enable


My coder is 100 points per turn
Where is the scale of the encoder?

It's : setp near.0.scale 1.000000

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10 years 1 month ago #80902 by PCW
Replied by PCW on topic Mesa 5i25 and 7i76 and encoder

setp near.0.scale 1.000000

is correct (the spindle velocity command and feedback are both in RPS)

With a 100 line quadrature encoder, the spindle encoder scaling should be 400
this is set in the ini file

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10 years 1 month ago #80903 by finemeca
Replied by finemeca on topic Mesa 5i25 and 7i76 and encoder
ok this is my ini file :
Code:
#******************** # Spindle #******************** [SPINDLE_9] P = 0.0 I = 0.0 D = 0.0 FF0 = 1.0 FF1 = 0.0 FF2 = 0.0 BIAS = 0.0 DEADBAND = 0.0 MAX_OUTPUT = 2500.0 OUTPUT_SCALE = 2500 OUTPUT_MIN_LIMIT = 200 OUTPUT_MAX_LIMIT = 2500

today is set to OUTPUT_SCALE = 2500

For an encoder 100 points, I have to put what?

100 or 1000

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10 years 1 month ago #80907 by PCW
Replied by PCW on topic Mesa 5i25 and 7i76 and encoder
output_scale must be set to max RPM (RPM at 10V to VFD)

input_scale must set to counts per turn (400 for a 100 line quadrature encoder)

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10 years 1 month ago #80909 by finemeca
Replied by finemeca on topic Mesa 5i25 and 7i76 and encoder
Ok I just take my config.
Linuxcnc OK but it will not always.
For the drive, it is wired like this:

https://goo.gl/photos/Th81Ptx2LnNri4J37

The spindle drive is a DC motor.
On this type of engine there is a dynamo.

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