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(1) First check whether the grid voltage is too low, the starting torque is proportional to the square of the voltage, the acceleration torque can not overcome the load torque, can not reach the running speed, and the grid voltage should be properly increased.
(2) Second, check whether the power fuse is blown. If one phase is cut off, the motor starts in single phase, the starting torque is zero, and the motor cannot rotate. Replace enough fuses.
(3) The load is too large or there is a fault in the drive shed machinery. Generally, the electric hoist matching the motor power is reasonable, lifting heavy objects can not be overloaded, if there is electric hoist can not rotate, first remove the load, such as the motor can start normally, indicating the gear box If the transmission mechanism is faulty, the dragged mechanism should be checked to clear the fault.
(4) Stator winding phase-to-phase short circuit, grounding or disconnection. When the winding grounding occurs at the lead-out ground plate, the junction box shall be opened for inspection. Not only check the motor when the circuit breaker is open, but also check whether the wiring of the control device is correct. If the contact of the AC contactor is bad, the circuit can't be connected. Use the sandpaper to smooth the mark of the contactor's contact, and check the iron core Disconnected, there is no jamming, replace the contactor if necessary.
18602180016 Meng Jing
After a long period of use, electric hoists are inevitably subject to failure. Hugong makes a summary of some common problems and hopes to help you understand some of the technical problems related to electric hoists.