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I'm going to check into the belt tension. I know too tight howls, but too loose?

Is this a lot?

Yes that`s what I did - this was the solution: to add a cia402.2.read-all and one cia402.2.write-all for the third servo as well.

Sounds like the drive has a significant offset or there is some electrical issue
What RPM do you get from the drive at 0V?

I is not for tuning overshoot but to have a slow but unlimited feedback

You can try more I term ( until it oscillates then back off to say 25% ) but I think the
real problem is the offset.

(the P term by itself cannot bring the error to 0 because the P term needs
and error to have any effect)

All this to say, it sounds like there is an electrical issue or perhaps drive
parameter setup issue that needs to be addressed rather than patched
over in LinuxCNC.

 

Also are the drives enabled?

Typically servo drives would have an enable input that must be connected to operate
(with default setup parameters)

Note that if LinuxCNC cannot communicate with the 7I76EU, LinuxCNC will not start.

I've been trying to understand why the system isn't pulling the revs down to 300, but seems ok above, so played with the ini file OUTPUT_SCALE
ini           5000      4500    3600
s.rpm                 Actual
300          450         480      490
500          600         630      700    
1000      1000       1050    1200
2000      1800       1900    2300
3000      2700       2800    3300
To me the control isn't controlling. I think it looks like P needs to be bigger, but if I raise it enough to have an effect, I get significant oscillations.
My understanding was I should raise P until it just oscillates, and then back off a little to be safe,  and lastly tune for overshoot with I. But with this method is not working for me. Is there another method please?