Mesa 7i77 and linear encoder tuning PID.

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14 Aug 2012 18:27 #23194 by ROG
P=5 zoomed

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14 Aug 2012 18:29 #23195 by ROG
sorry ... P=5
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14 Aug 2012 18:30 #23196 by ROG
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14 Aug 2012 18:31 #23197 by ROG
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14 Aug 2012 18:34 #23198 by PCW
OK so even with a gain of 5 its unstable (this is likely the velocity loop in the drive)

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14 Aug 2012 18:50 #23200 by ROG
New drives ...?
New servos ......?
Weeks of re-engineering mountings for different servos – I could cry!

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14 Aug 2012 19:00 #23203 by PCW
It really sounds like there is some filtering in the drive that needs to be turned off

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14 Aug 2012 19:13 #23206 by ROG
I’ve systematically y gone though turning things on and off, gradual changes in most of the parameters that seem to be relevant, eliminating what seems to be relevant and what’s not and nothing seems to make any difference.

Maybe an email to Omron ......

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15 Aug 2012 12:25 #23234 by VNR

Maybe an email to Omron ......

May you give me a link to the PDF user manual of this servo to see what can i do.. I do not promise you anything ;)
It will help if you simplify the system using only the encoders of the motor (LinuxCNC => Mesa card => Drive => Motor. Motor encoder => Drive => Mesa card => LinuxCNC) instead of adding the linear scales.
It will help also if you could get the software to auto tune the drive (without conection to the mechanics)

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15 Aug 2012 12:42 #23236 by ROG
Some bed time reading VNR .... www.f1-2000.co.uk/Datasheets/omron-reduced.pdf


Thank you so much ...... :)


If you look at this page,

www.f1-2000.co.uk/index.php?f=hardinge_hxl2

You’ll understand my woe with regard to changing motors!

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