1, according to voltage classification: high voltage soft starter, low voltage soft starter;
2, according to the classification of media: solid soft starter, liquid resistance soft starter;
3, according to the control principle: electronic soft starter, electromagnetic soft starter;
4, according to the operation mode: Online soft starter, bypass soft starter;
5, according to the load: standard soft starter, heavy-duty soft starter.
Energy saving principle
Motor is inductive load, the current hysteresis voltage, most of the electrical appliances are such.
Soft starter (Figure 5)
Soft starter (Figure 5)
In order to improve the power factor, the capacitive load must be compensated, and the capacitor or synchronous motor compensation. To reduce the excitation current of the motor can improve the power factor (HPS2 energy function, decrease the voltage in light load, the excitation current is reduced, the COS Phi increase). Energy-saving operation mode: light load voltage reduces the excitation current, the motor current is divided into active component and reactive component (excitation component) for improving COS.