Page 2 of 3
Re: Help with Eumach MC-800P retrofiting to OAK.
Posted: Thu Sep 02, 2021 5:04 pm
by cncsnw
OUT15 and OUT16 relate only to spindle drive control, not servo drive control.
The PLC program you are using should automatically select an alternate stage for spindle speed control (STG81) any time you have OUT15 set to select a bipolar analog range.
Again, that only affects spindle RPM control, not servo control.
Re: Help with Eumach MC-800P retrofiting to OAK.
Posted: Thu Sep 02, 2021 5:13 pm
by jhlarsen
You are right, i have fixed it now.
Now my problem is getting the +-10V to drive the servo...
Re: Help with Eumach MC-800P retrofiting to OAK.
Posted: Thu Sep 02, 2021 5:15 pm
by jhlarsen
How can i get the axis header to output +-10V?
Re: Help with Eumach MC-800P retrofiting to OAK.
Posted: Thu Sep 02, 2021 6:04 pm
by cncsnw
Put non-zero values in your PID gains.
I suggest starting with Kp = 0.01, and Kv1 = 80. You can leave the rest of the gains at zero to start out with.
Re: Help with Eumach MC-800P retrofiting to OAK.
Posted: Fri Sep 03, 2021 4:02 am
by jhlarsen
I did put those values in and i got the servo vibrate and it did not stop after a jog move forcing me to use the E-stop. Did not have time to play around with it more, so i will do some more testing today. Any idea what to do when it vibrate but not moving?
The Simodrive do have those ajustment. Do i leave those "factory tuned" or do i set those to zero and tune it on OAK?
Re: Help with Eumach MC-800P retrofiting to OAK.
Posted: Fri Sep 03, 2021 10:21 am
by jhlarsen
How can i turn off the encoder to one axis so i can work with the tuning without getting the position error all the time?
Re: Help with Eumach MC-800P retrofiting to OAK.
Posted: Fri Sep 03, 2021 2:01 pm
by cncsnw
To work with just one axis at a time, change the labels of all the other axes to 'N'.
The Centroid control will only enable axes with labels X, Y , Z, U, V, W, A, B or C. 'N' means "not installed", and 'M' means "manually-controlled".
If you get shaking with Kp = 0.01, then try Kp = 0.001 and work up from there.
You probably do not want to change the trim pots on the Siemens drive. If it worked before in analog velocity-mode control with the current trim settings, then it should still do so.
Re: Help with Eumach MC-800P retrofiting to OAK.
Posted: Fri Sep 03, 2021 2:46 pm
by jhlarsen
Cant get it to run the program so i can start to tune it. The servo just run off and get a y axis position error.
Re: Help with Eumach MC-800P retrofiting to OAK.
Posted: Fri Sep 03, 2021 5:25 pm
by tblough
Are you sure your encoder is counting in the correct direction? You may need to swap the A and B pairs to get the encoder count to be increasing when the motor is turning clockwise.
Re: Help with Eumach MC-800P retrofiting to OAK.
Posted: Fri Sep 03, 2021 5:43 pm
by jhlarsen
I did have to swap the leads and now it all works. I have tuned the pid and run the machine test with no issues
