The role of the "communication input reactor" of the inverter input device is mainly to improve the power factor of the communication power supply on the communication side of the input side; It is useful to eliminate the higher harmonics on the input side to avoid damage to other electrical equipment caused by voltage distortion; Eliminate the input current imbalance caused by the imbalance between the phases of the three-phase communication power supply.
Generally, when adding a communication input reactor, an "EMC input filter" should be installed on the input side of the inverter, which is primarily to reduce the external conduction and radiation of the inverter itself to the greatest extent.
Domestic inverters are basically adapted to the motor capacity of 37kw (50HP), the power input capacity of 114kvA, the input current of 157A, and the output current of more than 150A inverter, all of which are equipped with standard external DC reactors, and the models of the DC reactors equipped with them need to be adapted according to different powers.
The user needs to remove the short-circuit copper bar between the main circuit terminal P and (+) of the inverter when installing, and then connect the DC reactor between P and (+), and there is no polarity between the reactor terminal and the terminal O (+) of the inverter. When a DC reactor is installed, the short-circuit copper bar between P and (+) is no longer used.
The DC reactor is connected in series inside the inverter between the rectifier module and the filter capacitor. It works to improve the power factor on the input side; Improve the efficiency and thermal temperature of the inverter; It is useful to eliminate the influence of higher harmonics on the input side on the inverter, and reduce the external conduction and radiated electromagnetic disturbance of the inverter itself.
The "communication reactor" is close to the inverter device between the output side of the inverter and the drag motor. Its primary function is to filter the inrush current of the input side circuit to weaken the overcurrent impact of the power supply voltage imbalance on the inverter; Generally, the distance between the inverter and the motor is more than 100 meters, and it is recommended to install an output communication reactor. Because the output side of the inverter generally contains more higher harmonics. When the motor and the inverter are far apart, because there is a large distributed capacitance in the cable wire, a certain harmonic may resonate in the circuit, which will cause great damage to the insulation performance of the motor, and the motor will be damaged for a long time. In addition, because the line is long, a large leakage current will occur, which will cause frequent protection shutdown of the inverter.
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