Master control loop electrical damage to the electric hoist impact

Electric hoist at work will usually be some failures, there will mainly introduce the cause of the malfunction. When the lift hoist  Lord, electrical control circuit is damaged, the line is disconnected or bad, but also make hoist motor phase does not work, this phase is missing, the need to repair the main, the control loop, maintenance, in order to prevent the main, control loop gave power phase three-phase motors and burned the motor. Hoist motor terminal voltage is lower than the rated voltage, motor starting torque is too small, so do not move goods lifting hoists, 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. Electric  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 the hoist is overloaded with overloading the motor heat, long-term overload the motor will burn; 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 the motor heat 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,  hoist equipment  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.