As one of the most popular electrical devices in the new century, frequency converters have always been a focus of attention across various industries. With frequency converters gradually becoming a part of everyday life, their maintenance and upkeep techniques are also gaining importance and attention. After all, everyone wants their purchased frequency converter to last longer. So, how can we extend the lifespan of a frequency converter?
1. Correct wiring and parameter settings. Before installing the frequency converter, be sure to read its manual carefully and understand its usage, precautions, and wiring; after installation, set the parameters correctly according to the usage instructions.
2. Ambient temperature has a significant impact on the lifespan of frequency converters. For every 10°C increase in ambient temperature, the lifespan of the frequency converter is halved. Therefore, it is essential to properly address the issues of ambient temperature and frequency converter heat dissipation.
3. V/F control is a type of constant torque regulation. Vector control, on the other hand, increases the motor's output torque proportional to the square of the voltage, thereby improving the motor's output torque at low speeds.
4. If the system operates using a power frequency/variable frequency switching mode, the interlocking between the power frequency output and the variable frequency output must be reliable. Furthermore, starting and stopping the pump, and switching between power frequency and variable frequency, must all require stopping the variable frequency drive before operating the contactor. Since contact adhesion and the extinction of the arc in a large-capacity contactor require a certain amount of time, the sequence and timing of these switching operations must be carefully considered.
5. Problems with external control signals failing. This is generally due to several reasons: incorrect signal mode, incorrect terminal wiring, incorrect parameter settings, or a problem with the external signal itself.
6. Pay attention to the relationship between speed and head. The selection of the motor and its optimal operating range are crucial issues. If the frequency converter operates below 5Hz for extended periods, motor overheating becomes a significant problem.
7. The difference between overcurrent tripping and overload tripping. Overcurrent protection is mainly used to protect the frequency converter, while overload protection is mainly used to protect the motor. Because the capacity of the frequency converter sometimes needs to be one or two levels larger than the capacity of the motor, in this case, when the motor is overloaded, the frequency converter may not necessarily experience overcurrent. Overload protection is provided by the internal electronic thermal protection function of the frequency converter. When setting the electronic thermal protection, the "current draw ratio," which is the percentage of the motor's rated current to the frequency converter's rated current, should be accurately preset.
