升降货梯http://m.iyunsun.com/在运行中往往会出现单相运行，其故障表现为：升降货梯接触器在工作中常常由于电源电压过低或波动过大、触头上有油污或粉尘、表面高低不平、可动衔铁不吸合或吸合不完全、触头粘连或可动衔铁不释放、触点不断开、触点不闭合、时断时合等，有时还会出现电气控制回路电压过低或机械卡阻，致使升降货梯接触器吸合过程中有停滞现象，归纳起来这些失效形式可以分为粘连、卡死、断相等几种。
Cargo lifter often appear in the operation of single-phase operation, the breakdown as follows: Huoti contacts at work is often due to fluctuations in the power supply voltage is too low or too high, there is oil or dust on the contact surface uneven, movable armature do not pull or pull incomplete contact adhesions or movable armature not release, contact constantly open, not closed contact when off when you close, and sometimes there will be low voltage electrical control circuit or mechanical jamming, resulting in cargo lifter contactor pull in the process of stagnation, summed up these failure modes can be divided into adhesions, stuck, broken several equally.

其次，升降货梯http://m.iyunsun.com/线路连接松动不可靠、电动机因过载过热、断相、三相不平衡等，此类故障危害，极易造成升降货梯逆行。
Secondly, loose cargo lifter line connection is not reliable, motor overheat due to overload, phase failure, phase imbalance, such failures harm, can easily cause retrograde cargo lifter.