一、先了解软启动二次控制回路，一般软启动都有旁路接触器输出节点。
First, understand the soft start of the two control loop, the general soft start has a bypass contactor output node.
二、再了解负载启动时间，佳切旁路接触器时间是启动过程完成后。
Two, to understand the load start time, the best by-pass contactor time is the completion of the start-up process.
三、旁路接触器主回路应与软起并联。
Three. The main circuit of the bypass contactor should be parallel to the soft start.
四、将旁路接触器输出节点串入旁路接触器控制回路，好做一个自锁回路。其中，外接触器是直接起动用的，为并联关系，而且要求实现电气互锁。
Four, bypass the contactor output node into the bypass contactor control loop, preferably a self-locking loop. Among them, the external contactor is used directly for parallel connection, and requires electrical interlocking.
主要流程和配图：
Main processes and maps:
软起动器端子1L1、3L2、5L3接三相电源，软起动器端子2T1、4T2、6T3接电动机。软起动器可通过参数设定选择是否检测相序。当采用旁路接触器时，可通过内置信号继电器K2控制旁路接触器。
The soft starter terminals 1L1, 3L2 and 5L3 are connected to three phase power supply, and the soft starter terminals 2T1, 4T2 and 6T3 are connected to the motor. The soft starter can choose whether to detect the phase sequence through parameter setting. When the bypass contactor is adopted, the bypass contactor can be controlled by the built-in signal relay K2.