The inverter cannot be restarted automatically and the start is completed.

If the voltage is lowered to the following range, the intermediate relay is released, the self-locking is released, the foot of the inverter is disconnected, and after the power supply returns to normal, the inverter cannot automatically restart after the foot is disconnected, and the start is required. The feasibility of setting the self-starting parameters can be concluded from the experiment. The voltage is pulled down to an interval and the dwell time exceeds the self-starting function parameter to be effective. The pinch of the Shantou Science and Technology Academic and Empirical Device is not broken. The voltage is pulled down to one or less and stays. When the motor running on the production line exceeds the secondary control loop, the motor will stop running. After the power supply returns to normal, the inverter will not restart automatically because the foot is disconnected. It is necessary to manually start each motor. Therefore, according to the several voltage fluctuations that have occurred in our company so far, basically the inverter is stopped, and the whole plant non-frequency variable speed motor has only experienced a complete shutdown phenomenon. It can be seen that in the case of multiple voltage fluctuation accidents so far, basically, the voltage is only lost to an interval, and the residence time is greater than this.

The experimental results show that after the voltage fluctuation, the instantaneous starting current of the inverter will be close to twice the input current of the inverter, which is equivalent to the output current of the inverter before the voltage fluctuation, and the inverter motor running on the current production line will not reach. The rated current, the main switch of the inverter input switch and the inverter will not trip overcurrent. The mechanical part of the motor will not be greatly affected, of course, this needs to be verified. The voltage fluctuation inverter self-starting is used for the failure of the non-return control part. Due to the high pressure alarm and protection measures, the operation of the pre-stage pump can be stopped in time, and then the manual start operation can be performed. Therefore, through the above experimental analysis, it can be considered that setting the self-starting parameters can at least reduce the loss due to voltage fluctuations, and is completely feasible.

Slewing Controller

Slewing Controller is a kind of Tower Crane slewing control device, combined speed and voltage regulation and eddy current speed controling. The slewing control block control the speed of eddy current torque motor, to make the tower crane slewing mechanism start, working and stop smoothly. This kind of Slewing Controller is used to regulate and control the speed of three-phase torque motor of AC 50Hz, voltage 380V.

HRCV slewing controller is a hoisting slewing controller developed by our company according to service condition of customer.
The main technical feature as follows:
(1) This product combined the controller and thyristor module,the connection of the users is simple and easy.Prevent the damage of the controller and thyristor module caused by mis-wiring of the customer.
(2) Realize the best optimization of AC voltage control curve and DC voltage control curve.
(3) With the function of inching during operation, realize the accuracy.
(4) The electronic components adopt the imported industrial grade chip, on the control panel directly with power supply and direction indicator light.
(5) Adopt the coating treatment on the printed circuit board,enhance the dust prevention and anti-condensation capacity of the circuit board.

Slewing Motor,Tower Crane Spare Part,Slewing Mechanism,Slewing Reducer,Crane Slewing Mechanism,Tower Crane Slewing Motor

SHEN YANG BAOQUAN BUSINESS CO., LTD , https://www.sytoplesstowercrane.com

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