The main fault of the ABB contactor agent's coil is that it overheats and burns out due to excessive current passing through it. The cause of excessive current is usually the insulation damage of the coil, or the short circuit between turns or to the ground caused by mechanical damage, or the voltage of the power supply is too low, and the contact between the moving and static iron core is poor. Shut down. Coil current is too high. Coil overheats and burns.

　　由于相触点接触不良或连接螺钉松动，电机无相运行。这时，电机虽然可以转动，但发出“嗡嗡”的声音。如果发生这种情况，应立即停止维修。

　　Due to poor contact or loose connection screw, the motor has no phase operation. At this time, although the motor can turn, but issued a "buzz" sound. If this happens, repair should be stopped immediately.

　　按下“停止”按钮，电机不能停止，有的还会发出“嗡嗡”的声音。这类故障是由于接触器工作频率高、过载使用、负载侧短路等，使两相或三相触点因过载电流大而熔接。

　　Press the "stop" button, the motor can not stop, and some will send out a "buzzing" sound. This kind of fault is due to the contactor working frequency is high, overload use, load side short circuit, so that the two phase or three phase contact due to overload current and fusion.

　　ABB接触器代理正反向联锁失效，或两个接触器因误动作同时投入工作，造成相间短路；或者由于接触器动作过快，在转换过程中发生电弧短路。

　　ABB contactor agent positive and negative interlock failure, or two contactors due to misaction at the same time into work, resulting in phase short circuit; Or because the contactor action is too fast, in the process of conversion arc short circuit.

　　定期检查ABB接触器代理各部分的工作情况；接触器活动部分不卡死，动作灵活，实体部分不松动；触点和铁芯表面部分应保持清洁，如有油脂应及时清洗。当触点磨损严重时，应及时更换。

　　Check the working condition of each part of ABB contactor agent regularly; The active part of the contactor is not stuck, the action is flexible, and the entity part is not loose; Contact and core surface should be kept clean, if there is grease should be cleaned in time. When the contact wear is serious, it should be replaced in time.