Four reasons why electric hoist not working.
1. You can first check whether the power fuse of the device is blown. If one phase is broken, the electric hoist can not be rotated. The starting torque of the electric hoist of the crane is zero, so the motor of the device is not Will work, it is necessary to replace enough fuses.
2, there is the grid voltage is too low, so that the dynamic torque of the device is proportional to the square of the voltage, the acceleration torque can not overcome the load torque, can not reach the operating speed, need to do is he wants to improve the equipment Grid voltage.
3. Short circuit, grounding or disconnection of the stator windings. This refers to the occurrence of the lead grounding plate at the winding grounding wire of the electric hoist. What needs to be done is to open the junction box for inspection. It should be noted that when the short circuit is not possible to check the motor, it should be noted that check the electric hoist control equipment wiring is correct, if the AC contactor contact bad contact caused by the line can not be connected, then the sandpaper will contact the device Contact marks are worn flat, and at the same time also need to check the core pull-in and disconnection conditions, whether there is a stuck phenomenon, if any, it needs to be replaced.
4, there is also need to pay attention to is the load of the crane accessories electric hoist if it is too large, it will happen can not overload the hoisting object, which is the electric hoist can not rotate, the solution is to first remove the load, if the inspection of the electric The hoist motor can start normally, indicating that the transmission mechanism such as the reduction gearbox is faulty, and the dragged mechanism is checked to clear the fault. When running again, the entire crane needs to be tested. After the test is completed, it is put into use.