I need to change a motor (induction). Motor current is slight difference. New one is 30.5 A old one is 31.5 A. Other parameter are same.

As told after going online p10=1, then change current parameter, then p3900=1 .  My question is why P3900=1 , why not P10=0. What will do P3900=1.

Also when run motor id (stand still) from starter , only need to drive start , no need to set any speed as it is standstill.

Really appreciate if some one clarify.