- Check the Power Fuse The first thing to check is whether the power fuse has blown. If one phase is cut off, the electric hoist won’t be able to turn on, as the starting torque of the hoist motor will be zero. This means the motor won’t run. In this case, replacing the fuse with a suitable one is necessary.
- Low Voltage from the Power Supply If the voltage from the grid is too low, the torque required for starting the motor will not be enough to overcome the load's torque. This can prevent the motor from reaching its operating speed. The solution is to increase the voltage supplied to the equipment.
- Stator Winding Issues (Short Circuit, Grounding, or Open Circuit) Sometimes, the hoist's stator windings can have short circuits, grounding issues, or open circuits. If there’s a grounding issue, it could be at the connection point of the grounding wire. To fix this, open the junction box and inspect. Note that you shouldn’t inspect the motor when there’s a short circuit. Also, check whether the wiring of the control devices is correct. If the contact points on the AC contactor are worn and causing a poor connection, sandpaper the contact surfaces to smooth them out. At the same time, check the core for proper engagement and disengagement, ensuring there’s no blockage. If there is, it may need replacing.
- Overloading of the Hoist If the load on the electric hoist is too heavy, it won’t be able to lift the load, resulting in the hoist not turning. To solve this, first, remove the load. If the motor starts normally after this, it suggests there may be a fault in the gearbox or other transmission components. Check the driven parts and clear any faults. Run the crane for a test afterward, and if everything works well, it can be put back into operation.