ASDA-B2 Drive in position control mode problem

[wadi]

I have a project on an automatic belt loop setter machine. I changed the X and Y drivers with ASDA-B2 and made tuning on the machine, and the machine works as normal but i have a problem when the speed slow down , the zigzag stitches in Y axes gets narrowing and when the speed goes up the stitches takes a little wide , means in low speed maximum travelling distance 2.5 mm in Y and when speeds up it gets to 3 mm but i want in all speeds the travelling distance must be the same and when speeds the machine from 500 rpm to 1900 rpm for example the zigzag is not uniform.

Is the frequency Bandwidth problem or tuning is not good ? because in an other servo drive there was not any problem , the old one was SANMOTION type.

or , Is the rigid holding makes slipping which made ununiformed zigzag ?

[Turhan]

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