At last got some time to connect everything
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Ofcourse there is a problem , It seems it has something with the drives, because I can not eliminate the effect with Linuxcnc tuning.
first drive on X tunes fairly well (about 0.015mm ferrror on start and stop and 0.002 while moving), but has some oscillation while moving. Second drive on Y needs 0.1 I so the ferror centers on line and can not be tuned as good as X. Third drive on Z (counterbalanced) has constant oscillation and needs I = 3 to lower the static ferror down to centerline. It wont tune right , moving up is smooth but down is bumpy and in halscope it is seen as oscillation.
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I have the manual for the drives , they are set for velocity mode P0-1 = 4 . There are two AGND pins 35 and 36, if analog gnd is connected on pin 35 it wont work, so I tried on 36 also and connecting both together.
Servo drive manual
Tried P and I parameters in drives Cotrol parameter section P1-0 and P1-1 , cant seem to help , lowering P1-0 leads to poor responce, Tried P1-1 up to 3000 it just slows down the response.
Also tried P3-08 Speed feedback filter time parameter ... from default to 0 ... no help its always the same.
Anyone has any suggestions ?
None of the motors seems sto stand still and hunting .