1. What are the meanings of the models that can be given separately for the acceleration time and deceleration time, and the acceleration and deceleration time? Acceleration and deceleration can be given separately. It is suitable for short-time acceleration, slow deceleration, or for small machine tools where the production tact time is strictly required. However, for fan drive and other occasions, the acceleration and deceleration time is longer. The acceleration time and deceleration time can be given together. 2. What is regenerative braking? If the motor is lowered during operation, the motor will operate as a brake due to the load inertia and the motor will operate as a brake. This is called regenerative (electrical) braking.