How can the inverter "longevity"

The frequency converter is one of the hottest electrical devices in the new century and has attracted the attention of various industries. Although the frequency changer has stepped into our lives, there are always problems such as breakdowns, and users need to pay more attention to maintenance skills. What extent can we achieve to make the inverter "longevity"?

1. Correct wiring and parameter settings. Before installing the inverter, you must familiarize yourself with its manual, master its usage, precautions, and wiring; after installation, set the parameters correctly according to the use.

2. V/F control is constant torque adjustment. The vector control increases the output torque of the motor in proportion to the square of the voltage, thereby improving the output torque of the motor at low speed.

3, the problem of external control signal failure. There are generally several situations: Incorrect signal mode, incorrect terminal wiring, incorrect parameter settings, or external signal itself.

4. The ambient temperature has a great influence on the service life of the inverter. If the ambient temperature is 10°C per liter, the life of the inverter will be reduced by half. Therefore, the ambient temperature and the heat dissipation of the inverter must be solved.

5, pay attention to the relationship between speed and head. The choice of the motor and its best work section are more important issues. If the inverter runs below 5Hz for a long time, the motor heating becomes a prominent problem.

6. If the system is operated by the power frequency/frequency conversion switching mode, the interlock between the power frequency output and the variable frequency output must be reliable. And stop the pump, power frequency / frequency conversion must stop the converter, and then operate the contactor. Since the contact sticking and the extinguishment of the arc of the large-capacity contactor require a certain amount of time, the order and time of the above switching must be considered comprehensively.

7. The difference between over-current trip and overload trip. Overcurrent is mainly used to protect the inverter, while overload is mainly used to protect the motor. Because the capacity of the inverter sometimes needs to increase one or two gears compared to the capacity of the motor. In this case, the inverter will not necessarily over-current when the motor is overloaded. Overload protection is performed by the internal electronic thermal protection function of the inverter. When presetting the electronic thermal protection, the percentage of the ratio of the rated current of the motor to the rated current of the inverter should be accurately preset.