软启是现代先进流行的电动机启动器。它一般采用16位单片机进行智能化控制。可无级调压至佳启动电流，保障电机在负载要求的启动特性下平滑启动。在轻载时节约电能
Soft start is the most advanced and most popular motor starter in modern times. It usually uses 16 bit singlechip to carry out intelligent control. It can be stepless to the best starting current to ensure that the motor starts smoothly under the starting characteristic of the load requirement. Saving electric energy in light load
软启实际上是个调压器，只改变输出电压并没有改变频率，这一点与变频器不同。
The soft start is actually a voltage regulator, which only changes the output voltage and does not change the frequency, which is different from the frequency converter.
是用软启应注意的问题
It is a problem that should be paid attention to with soft start
1软启本身没有短路保护 ，为了保护晶闸管，应该采用快速熔断器
1 the soft start itself has no short circuit protection. In order to protect the thyristor, the fast fuse should be used.
2当软启使电动机制动停机时，只是由于晶闸管不导通，使电输入电压为0V在电机与电源之间没有电气隔离，应在软启与电源之间增设断路器
2, when the soft start makes the motor brake stop, it is only because the thyristor is not connected, so that the electrical input voltage is 0V. There is no electrical isolation between the motor and the power supply. A circuit breaker should be added between the soft start and the power supply.
3当软启功率大或台数较多时，产生高次谐波对电网产生不良影响，对电子设备产生干扰。应加旁路接触器
3 when the power of the soft start is large or the number of stations is large, the high harmonic generation will have a bad effect on the power grid, and the interference to the electronic equipment is produced. Additional bypass contactor
4根据实际需要编程
4 programming according to the actual needs
5满足软启的使用条件
5 meet the conditions of the use of soft start
