Soft-starter electronic equipment is the starting device for induction motors, all in a solid state, ie based on semiconductor switches. The principle of operation of the soft-starter is, like electromechanical systems, to reduce the initial starting voltage and how the torque is proportional to the current, and that to voltage, the electric motor will start with reduced torque. As a rule, the soft-starters have acceleration ramp adjustment. This adjustment can be done via potentiometer or HMI (Human Machine Interface). A5835 OLP
Static starters are microprocessor keys designed to accelerate or decelerate and protect three-phase induction motors and by setting the thyristor firing angle, we control the effective voltage applied to the motor. With correct adjustment of the variables, the torque and current are adequate to the needs of the load, ie, the required current will be the minimum required to accelerate the load without changes of frequency. Some features and advantages of the soft-starters are the setting of the starting voltage for a predefined time, the starting voltage pulse for loads with high starting torque, fast voltage reduction at an adjustable level, protection against phase overcurrent and undercurrent.