What is the reason why the electric hoist cannot operate when the crane accessories are stopped

Have you ever encountered a situation where the electric hoist on a crane suddenly stops and cannot operate in daily crane use? How should we deal with such problems when they arise? The first thing we need to do is to carefully investigate the origin of the fault. First, check if it is caused by the burning of the power fuse. If one section of the power fuse is broken, the motor can only start single-phase and the starting torque is zero, which leads to the lack of power source for the electric hoist and stops. At this point, everyone should replace the fuse in a timely manner. If the voltage inside the crane electrical network is very low, causing a positive correlation between the starting torque and the square of the voltage, the motor will not be able to withstand the acceleration torque, and the electric hoist will not be able to operate. When the weight lifted by the crane exceeds the rated load, the electric hoist will also suddenly stop and cannot operate. The operator can conduct the test operation by reducing the load they bear. If it is found that the electric motor can operate normally, it indicates that the gearbox of the crane has malfunctioned.