Motor Resonance

I have a mesa 7i96 and I am using clearpath servo motors which provide no singles back to the 7i96. But anyway when I am testing the motors I move the axis and then stop it and it starts to resonate. I have previously used Mach4 and I did not have this problem. When I looked at the clearpath diagnostics software I noticed that when I moved the axis and stoped the axis the direction signal was fluctuating and the step single was fluttering on and off. It is almost like Linuxcnc is trying to give the motors feedback when the clearpath servo motors already provide there own feedback. Some suggestions would be greatly appreciated.

please post your config files. probably need to adjust your PID values a bit.

Chris

In the hal file, check if you have something like " .........maxerror 0.5 " or similar, delete all the line containing that.
It might also be from interferences from unshielded cables.

I have attached my config files. I searched the base_config.hall for maxerror and there are 6 instances that all say

CNC32 wrote: I have attached my config files. I searched the base_config.hall for maxerror and there are 6 instances that all say

Code:

step pid.x.maxerror .0005

Delete those lines and the lines above them. something with "previous error......."
Or just put # in front of those lines, save and restart Linuxcnc.

Thakyou tommylight for the help!

I have just edited that hal file and commented them out with a # in front of the lines for example When I go to run linuxCNC I get an error message saying
I have reverted back to the original hal file.

I have included the modified hal file here

That error says you have something wrong on line 1 of the hal file, everything else looks ok.

You need these lines:

setp pid.N.error-previous-target true

PCW wrote: You need these lines:

setp pid.N.error-previous-target true

Sorry, i thought that should also go, was not sure though.
Thank you.

The reason the step/dir output is dithering is because you have a P term of 10000
This should normally be 1/servo thread period = 1000