How to correct servo

why does my servo become constant at a different value than what is desired? I have a compacted piston with clusters which I want to apply a constant pressure at both ends.
Thank you

Hello Mehrdad,
It is difficult to determine why the servo does not maintain the value you specify without seeing your code. Could you please send your inquiry and data file to PFCsupport@itascacg.com.

Thank you for your answer .