According to the controlled target and operating parameters such as voltage, current, power, frequency and operating system, the additional parameters of the contactor are determined.
1) The coil voltage of the contactor should generally be lower, so that the insulation requirements of the contactor can be reduced, and it is safer to use. However, in order to facilitate and reduce the equipment, it is often selected according to the actual grid voltage.
2) The operating frequency of the motor is not high, such as compressors, pumps, fans, air conditioners, punches, etc., and the additional current of the contactor is greater than the additional current of the load. The type of contactor can be selected Delixi CDC10 communication contactor, etc.
3) Counterweight mission motors, such as machine tool main motors, lifting equipment, winches, crushers, etc., have an average operating frequency of more than 100 times/min, and can be used for CJl0Z and CJl2 contactors when running in starting, jogging, forward and reverse braking, reverse braking, etc. In order to ensure the electrical life, the contactor can be used to reduce the capacity. When selected, the additional current of the contactor is greater than the additional current of the motor.
4) For the heavy mission motor, such as printing press, boring machine, etc., the operation frequency is very high, up to 600-12000 times/h, often running in the starting, reverse braking, reverse and other conditions, the contactor can be roughly selected according to the electric life and starting current, and the contactor type is CJl0Z, CJl2, etc.
5) When the capacitor in the communication loop is put into the grid or removed from the power grid, the contactor selection should consider the closing inrush current of the capacitor. Generally, the additional current of the contactor can be selected by 1.5 times the additional current of the capacitor, and the type is selected Delixi CDC10 communication contactor.
6) When using a contactor to control the transformer, the size of the inrush current should be considered. For example, communication arc welding machine, resistance welding machine, etc., generally can be selected according to 2 times the additional current of the transformer, the type of Delixi CDC10 communication contactor, etc.
7) For electric heating equipment, such as resistance furnaces, electric heaters, etc., the cold resistance of the load is smaller, so the starting current is correspondingly larger. When selecting the contactor, it is not necessary to consider (starting current), and can be selected directly according to the additional current of the load. The type can be selected Delixi CDC10 communication contactor, etc.
8) Due to the large starting current of the gas discharge lamp, the starting time is long, about the control of the lighting equipment, the communication contactor can be selected according to the additional current 1.1-1.4 times, and the type can be selected Delixi CDC10 communication contactor.
9) The additional current of the contactor refers to the maximum promised current of the contactor under long-term operation, the duration is ≤8h, and it is installed on the open control board, if the cooling conditions are poor, when the contactor is selected, the additional current of the contactor is selected according to 110%-120% of the additional current of the load. In the case of motors that operate for a long time, the oxide film has no chance to be removed, which increases the contact resistance, causing the contact to heat up beyond the promised temperature rise. In practice, the additional current of the contactor can be reduced by 30%.
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