Soft starter definition and action

Soft starter definition and action

Wed Jun 29 14:17:11 CST 2022

Soft starter definition and action

Soft starter is concatenated between power supply and was charged with motor, through the microcomputer control of its internal thyristor trigger conduction Angle to realize ac voltage regulation, make the motor input voltage from zero to the default function relations gradually rise, until the end, starting to give full voltage of the motor, is the soft start, in the process of soft starter, motor starting torque increase gradually, speed also increases gradually, until the thyristor conduction, all motor working in the rated voltage on the mechanical properties of smooth start, reduce the starting current.Avoid starting overcurrent trip.When the motor reaches the rated revolution, the starting process ends, and the rated voltage is provided for the normal operation of the motor.

Soft Starter (Soft Starter) is a new motor control device that integrates Soft start, Soft stop, light load energy saving and a variety of protection functions.The soft starter USES a three-phase parallel thyristor as the voltage regulator, which is connected between the power supply and the motor stator.Such circuit as three - phase full - control bridge rectifier circuit.When a soft starter is used to start the motor, the output voltage of the thyristor gradually increases and the motor gradually accelerates until the thyristor is fully conducting. The motor works on the mechanical characteristics of the rated voltage to realize smooth start, reduce the starting current, and avoid starting overcurrent tripping.When the motor reaches rated revolution, the starting process is over, and the soft starter automatically replaces the completed thyristor with a bypass contactor to provide rated voltage for the normal operation of the motor, so as to reduce the heat loss of the thyristor, extend the service life of the soft starter, improve its work efficiency, and avoid harmonic pollution of the power grid.Soft starter also provides soft stop function, soft stop and soft start process, the voltage is gradually reduced, the revolution is gradually reduced to zero, to avoid free stop caused by the torque impact