Did you enter the correct values from the old drive? and preform a new learnrun and loadweigh calibration?
I would look at some specific parameters to start with:
LoadW Type (Type of loadweigh device)
SysInert (Inertia)
Balance (Balance of the system in %, Car/Counterweight)
ALWcomp Corr (Correction factor for internally calculated loadweighing compensation torque, ect Rollback/Rollforward)
What kind of software does your drive use? (ect GAA30785CAF or another software?)
/Alex