软启动器维修故障-F 04(输入缺相)：
Soft starter Maintenance Fault -F 04 (input phase missing):
引起此故障的因素有良多种，下面列出一些：
There are many factors leading to this failure, some of which are listed below:
(1) 检查进线电源与电机接线是否有松脱;
(1) check whether the wiring of the incoming power and motor is loose or not;
(2) 输出是否接上负载，负载与电机是否匹配;
(2) whether the output is connected to the load and whether the load matches the motor;
(3) 用万用表检测软起动器的模块或可控硅是否有击穿，及它们的触发门极电阻是否符合正常情况下的要求(一般在20~30欧左右);
(3) use multimeter to detect whether the module or SCR of the soft starter has breakdown, and whether the trigger gate resistance meets the requirements of normal condition (usually around 20~30 euro);
(4) 内部的接线插座是否松脱。
(4) whether the internal wiring socket is loose or not.
以上这些因素都可能导致此故障的发生，只要细心检测并作出准确的判定，就可予以排除。
All of these factors may lead to the occurrence of this fault, as long as careful detection and make accurate decisions, you can be ruled out.
