Electric hoist electrical fault

1. Test with a test pencil to check whether the power supply system is supplying power to the electric hoist;
2. Damage of the electrical appliances of the hoist main and control circuits, disconnection of the line or poor contact will both prevent the electric hoist motor from being energized. 
In this case, the main and control circuits need to be repaired. The power of the three-phase motor is burnt out due to lack of phase, or the hoist motor is suddenly powered to run, causing harm. Be sure to disconnect the hoist motor from the power line, and only supply power to the main and control circuits.
Check and analyze the working conditions of the control electrical appliances and circuits, repair or replace the defective electrical appliances or circuits, and confirm that the main and control circuits are not faulty before re-commissioning;
3. The electric hoist motor terminal voltage is more than 10% lower than the rated voltage. The starting torque of the motor is too small, so that the hoist cannot lift the goods and cannot work. 
When checking, use a multimeter or a voltmeter to measure the voltage at the motor input. If the voltage is indeed too low to start the motor, wait until the system voltage returns to normal before using the electric hoist.
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