When the direction of a 3 phase induction motor is changed , is there may be any losses increases?

A first order answer will be no.

Hi everybody I have got a problem while starting a 150 hp motor connected to a water pump by a l&t make soft starter .the problem is when the valve of the pump is fully open posision motor trips before achieving full speed. But it works well when slowly open the valve.my question is how can we achieve more starting torque with this soft starter(model;VSXi) I hope somebody can solve my problem.

There will be no losses