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 rated current of the contactor is greater than the rated current of the load. The contactor type can be CJl0, CJ20, 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 run in starting, jogging, forward and reverse braking, reverse braking, etc., CJl0Z and CJl2 contactors can be selected. In order to ensure the electric life, the contactor can be used to reduce the capacity. When selected, the rated current of the contactor is greater than the rated current of the motor.
Notes:
1. For the main circuit, the change of frequency affects the skin effect, and the skin effect increases when the frequency is high, and for most products, 50 Hz and 60 Hz have little impact on the temperature rise of the conductive circuit.
2. It is necessary to pay attention to the introduction coil, the magnetic flux of the magnet wire used in the 50 Hz planning for the 60 Hz magnet wire will be reduced, and the suction power will also be reduced, and whether it can be used depends on the margin of its planning. Under normal circumstances, the user should use it according to its calibration value, and order according to the operating power frequency used when ordering.
3. The number of operating cycles per hour of the contactor has a great impact on the burning loss of the contact, so attention should be paid to the selection, and the applicable operation frequency is given in the technical parameters of the contactor. When the actual operating frequency of the electrical equipment is higher than the given value, the contactor must be degraded.
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