I have a Cincinnati/Lamb V5 2000 CNC milling center with a 840 D, 317 PLC and 611 drives.
We sent the Y axis motor out for rebuild and when we put it back on, the Y axis scale and the motor encoder do not like each other anymore. As the axis moves the encoder and the scale grow further apart. I sent the motor back to Siemens and its still has the same issue.
Have you come across this before?