abb acs 800 drive
To understand the reason of this mistakes of your drives, we need to know some other detail. Did the master / follower configuration work when it was started?
What happened or what has changed recently?
Do you have checked the encoder feedback?
If you give us more information, we can help you better
Master/Follower Control is made by VFD or Control System? If the application doesn't need backward direction, make sure the drives have dissabled order in both directions (Check Parameter 10.03 REF DIRECTION "FORWARD").
Please check if Torque Control Macro is implemented, normally T-CONTROL Macro is used for Master/Follower applications. (Check Parameter 99.02 APPLICATION MACRO "T-CTRL").