In order to ensure the safe, efficient and reliable operation of the inverter, the following keys should be grasped when using the inverter:
1) It is necessary for the grounding terminal of the inverter to be firmly grounded, so as to effectively press the radio frequency disturbance and enhance the reliability of the system: the frequency conversion speed regulation system is best to use independent grounding, and the grounding resistance is less than 1Ω. The grounding wires such as sensors, I/O interfaces, and shields in the frequency conversion speed regulation system should be independently connected with the grounding busbar of the system.
2) The ambient temperature has a great impact on the service life of the inverter, and the life of the inverter is halved for every 10 °C of the ambient temperature, so the ambient temperature and heat dissipation around the inverter must be dealt with. In order to ensure the safe and reliable operation of the inverter, the inverter should be placed in an air-conditioned environment, the temperature should be controlled at 25 °C±3 °C, and the relative humidity RH should be ≤70%-75%. Practice has proved that the failure rate of the inverter in the air-conditioned environment is much less than that in the air-conditioned environment, and the reliability of the system has also been strengthened.
3) Correct wiring and parameter setting. Before installing the inverter, it is necessary to read its manual carefully to grasp its usage, precautions and wiring; After the inverter is installed according to the technical conditions required by the inverter device, the parameters are correctly set according to the application requirements. It is not advisable to install a communication contactor between the inverter and the driven motor, so as to avoid overvoltage and damage to the inverter at the moment of contactor breaking. The output of the inverter cannot be equipped with a capacitance compensation device to avoid the overheating damage of the capacitor caused by higher harmonics and the malfunction of the inverter's overcurrent maintenance.
4) The operation and abort of the inverter can not be operated directly by the circuit breaker and contactor, but should be operated by the inverter control terminal or the inverter panel keyboard, otherwise the inverter will be out of control, and the inverter may be damaged.
5) Prevent the use of inverter to drive the motor that does not match its capacity, the small capacity of the motor will affect the output of the torque, and the harmonic weight of the current will increase if the capacity is too large, which will have a negative impact on the frequency conversion speed regulation system. When using one inverter to drive multiple motors, in addition to making the total current of the motor less than the rated current of the inverter, it is also necessary to consider at least the influence of the starting current of the maximum motor to prevent the overcurrent maintenance action of the inverter. When the driven motor is equipped with a brake, the inverter shall operate in the free shutdown mode, and the action signal of the brake shall be announced after the inverter stop command is announced.
6) The selection of the motor and its best working section is a key consideration in the design, if the inverter runs below 5Hz for a long time, the motor heating will become an outstanding problem. When the motor is operated at low speed with the inverter, due to the decline of the cooling effect of the motor, the temperature rise of the motor is too high, which is not conducive to the safe operation of the motor, it is necessary to ensure that the motor has excellent ventilation conditions, and if necessary, the external ventilation and cooling method should be adopted, and the design should prevent the motor from running in the low-frequency area for a long time.
7) The inverter can arbitrarily adjust the speed of the motor, which brings convenience to the conditioning, but each motor has its certain natural frequency, if the speed frequency of the motor is just to meet the production requirements, but just close to the natural frequency of the motor, resonance will occur, bringing severe damage to the motor, therefore. On the premise of satisfying the production requirements, it is necessary to consider avoiding the critical speed of the motor as much as possible.
8) Under the premise of conforming to the design specifications, the length of the cable between the inverter and the motor should be shortened as much as possible to reduce the dispersion capacitance of the cable between the inverter and the motor, so as to reduce the parasitic current during the low-frequency operation of the inverter.
9) It is strictly forbidden to directly measure the insulation resistance of the inverter with the insulation resistance meter, and it is necessary to disconnect the inverter and all weak current components when carrying out the insulation shake test, these components can not be measured by the insulation resistance meter, and the inverter should not be tested for withstand voltage.
10) If the frequency conversion speed regulation system adopts the power frequency and frequency conversion switching mode to operate, the interlock between the power frequency output and the frequency conversion output should be reliable. And when switching between power frequency and frequency conversion, the output of the inverter should be blocked before the contactor is operated. Since it takes a certain amount of time for the contact adhesion and the arc of the high-capacity contactor to be calmed, it is necessary to cooperate optimally in the sequence and time of switching.
11) Install an electromagnetic disturbance filter at the input end of the inverter, which can effectively press the conduction disturbance of the inverter to the power grid, install a communication reactor at the input end of the inverter and install a DC reactor on the DC bus of the inverter, which can improve the power factor, reduce harmonic pollution, and have a good inductive effect. In applications where the interval between the motor and the inverter is more than 100 m, it is necessary to install a communication output reactor at the output end of the inverter to deal with the leakage current caused by the dispersion parameter of the output wire to the ground, so as to reduce the radiation disturbance to the outside.
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