Master control loop electrical damage to the electric hoist impact

wire rope hoist at work will usually be some failures, there will mainly introduce the cause of the malfunction. When the hoist Lord, electrical control circuit is damaged, the line is disconnected or bad, but also make wire rope hoist motor phase does not work, this phase is missing, the need to repair the main, the control circuit maintenance, in order to prevent the Lord, three-phase motor control circuit to give power to the motor phase and burned.

Hoist motor terminal voltage is lower than the rated voltage, motor starting torque is too small, so do not move goods lifting  lift hoist  , and unable to work. Abnormal noise occurs in the control loop, making noises, typically contactor fails to deal with fault contactor maintenance, overhaul can not be replaced. Motor makes any abnormal noise, immediately stop and check whether the motor running single phase, or bearing damage, coupling axis errors and "sweep chamber" faults, abnormal noise from the gearbox issue, reducer fails, then should stop examination, first determine the reducer gearbox or bearing on whether to raise the oil prior to use, whether to use periodic oil change. wire rope hoist long-term application, the brake ring wear is too large, the brake spring pressure decreases, the braking force is reduced.

Should first check to use wire rope hoist is overloaded, overloading the motor heat, long-term overload will burn motor; motor is not overloaded, still hot, you should check whether the motor bearing damage; should also check whether the motor is required duty work, which is caused by electrical heating One of the reasons, should be used in strict accordance with the motor duty work. Weight rose to the air, check the system voltage is too low or fluctuating too large, this kind of situation is generally contactor contact welding, when you press the stop switch when the contactor contacts can not be disconnected, the motor was as usual power operation,  lift hoist  without stopping; into extreme positions such as limit malfunction, Hulu does not stop. This happens, immediately cut off the power, the gourd forcibly stop. Winter construction, the circuit still can not start the motor without failure, the reason is the brake ring freezing.