1. First, check if the equipment's power fuse has blown. If it's a single-phase issue, the electric hoist will not be able to rotate. The starting torque of the crane's electric hoist is zero, meaning the motor will not operate, and sufficient fuses need to be replaced.

2. Additionally, the low voltage in the power grid is an issue. Since the dynamic torque of the equipment is proportional to the square of the voltage, the accelerating torque cannot overcome the load torque, resulting in insufficient operating speed. The necessary action is to increase the voltage of the power grid for the equipment.

3. Stator winding inter-phase short circuit, grounding, or open circuit refers to the grounding wire of the electric hoist winding appearing at the lead connection plate. The necessary action is to open the junction box for inspection. It is important to note that the motor should not be checked during a short circuit. It is also necessary to check if the control device wiring is correct; if the contactor contacts are not properly connected due to poor contact, the sandpaper should be used to smooth out the contactor contact spots. Additionally, it is essential to inspect the core's attraction and disconnection, for any signs of jamming. If present, a replacement is required.

4. Another point to note is that if the electric hoist of the crane's components is overloaded, it will result in the inability to lift heavy loads and prevent overloading, meaning the electric hoist will fail to rotate. The solution is to first remove the load. If the motor can start up normally, it indicates that there is a fault in the transmission mechanism, such as the reducer. Check the driven mechanism and clear the fault. Before reoperation, the entire crane must be tested. Only after a successful operational test should it be put into use.