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Additional parameters for the frequency converter. (1) Additional parameters on the input side. ① Additional voltage → The additional voltage of low-voltage frequency converters includes single-phase 220-240V (mainly small capacity frequency converters in household appliances), three-phase 220V or 380-460V. The additional voltage of low-voltage frequency converters in China is mostly three-phase 380V, while the additional voltages of medium and high-voltage frequency converters are 3kV, 6kV, and 10kV Additional frequency → Generally specified as 50Hz or 60Hz for power frequency, with 50Hz in China. (2) Additional parameters on the output side. ① Additional output voltage → As the output voltage of the frequency converter varies with frequency, its additional output voltage can only be specified as the maximum value of the output voltage, usually at the same level as the additional voltage on the input side. ② Additional output current → Additional output current refers to the maximum current allowed for long-term output, which is the main basis for users to choose frequency converters Additional output capacity → The additional output capacity is determined by the product of the additional output voltage and the additional output current. Se=√ 3UeIex10? 3. The additional output of S in the equation, kVA; Ue additional output voltage, V; Ic additional output current, A. It should be pointed out that the additional capacity of the frequency converter is indicated by the additional output current (A), the additional active power (kW), and the additional apparent power (kVA).
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Although the frequency converter has soft start, soft parking, stepless speed regulation, and special requirements for increasing and decreasing characteristics, it has protection functions such as overload, overvoltage, undervoltage, short circuit, grounding, and various warning, prediction information, status information, and diagnostic functions; But if the power matching between the frequency converter and the motor is not selected correctly, or if the basic parameter selection is not set correctly, it will appear that the motor has burned out, but the frequency converter still has output; This situation generally does not appear in the homework of teachers who are familiar with frequency converters.
Simply put, setting the parameters of the frequency converter and motor correctly, such as additional power, additional frequency, additional voltage, additional current, additional output capacity, etc., is a condition to ensure the normal operation of the frequency converter and fully utilize its performance. Mastering the operation method of basic parameter setting is the key step in operating the frequency converter. Regardless of the brand of frequency converter and motor, self-learning (also known as automatic tuning) of motor parameters is necessary when selecting power matching. It copies the parameters on the motor nameplate of the frequency converter to the internal memory chip of the frequency converter; Copying motor parameters to the internal frequency converter includes two processes: parameter upload and parameter download. During this process, parameter upload refers to uploading the parameters from the frequency converter control board to the memory (EEPROM) of the operation display board for saving; Parameter download refers to downloading and saving the parameters stored in the operation display panel to the control board of the frequency converter
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