The problem of the operational electric hoist not being able to operate can be solved by systematically investigating the power supply, control circuit, motor status, and load situation. The following are the specific steps and analysis:

1、 Power check

Confirm power supply system: Use a test pen or voltmeter to check the power input terminal of the electric hoist to ensure that the power supply is working properly. If power is not delivered, wait for it to be delivered before proceeding with the operation.

Check the power supply voltage: Use a multimeter or voltmeter to measure the input voltage of the motor, ensuring that the voltage is within ± 10% of the rated voltage. If the voltage is too low, wait for the voltage to return to normal before using the electric hoist.

2、 Control circuit inspection

Check the electrical appliances and wiring of the main and control circuits: If the power supply is normal but the electric hoist still cannot work, it may be due to damage to the electrical appliances of the main and control circuits, disconnection of the wiring, or poor contact. At this time, it is necessary to inspect the main and control circuits, check whether the electrical components (such as contactors, circuit breakers, etc.) are damaged, and whether the wiring is firmly connected.

Jogging test: When repairing the main and control circuits, in order to prevent the power supply to the three-phase motor from missing phase and burning out the motor, or the sudden power on operation of the hoist motor causing harm, it is necessary to disconnect the hoist motor from the power line and only supply power to the main and control circuits. Then jog the start and stop switches to check and analyze the working condition of the control electrical appliances and circuits. Repair or replace faulty electrical appliances or circuits. Only after confirming that there are no faults in the main and control circuits, can the test run be restarted.

3、 Motor inspection

Check if the motor is damaged: If both the power supply and control circuit are normal, but the electric hoist still cannot work, it may be due to motor damage. At this point, it is necessary to check whether the motor has been burned out, severely cleaned, etc. The motor status can be determined by detecting the current and voltage of the motor. If any abnormalities are found, the motor needs to be repaired or replaced.

Check the motor bearings: If the motor is not overloaded but the temperature rise is too high, it may be due to damage to the motor bearings. At this time, it is necessary to check whether the motor bearings are worn, whether the lubrication is good, etc. If necessary, the bearings need to be replaced.

4、 Load inspection

Confirm that the load is within the rated range: Overloading can cause difficulty or inability to start the electric hoist. At this point, it is necessary to check whether the load is within the rated lifting capacity range of the electric hoist to ensure safe use.

Check if the load is uniform: Uneven load can cause unstable operation of the electric hoist. At this point, it is necessary to check whether the load is evenly distributed and ensure that the center point of the load is aligned with the center of the hoist.

5、 Other inspections

Check the brake: If the brake is stuck or malfunctioning, it will affect the descent control of the electric hoist. At this point, it is necessary to check whether the brake is stuck or malfunctioning, and adjust or replace it if necessary.

Check the remote control: If using the remote control to operate the electric hoist, it is necessary to check whether the remote control battery is sufficient and whether the signal is good. If the remote control malfunctions, it is necessary to replace the battery or adjust the signal reception environment.

The main equipment produced by Hebei Makita: stage electric hoist, electric chian hoist, wire rope electric hoist，Hand chain hoist, lever hoist, pneumatic hoist and other lifting equipment