PC-E984-685 SCHNEIDER 变频器
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PC-E984-685 SCHNEIDER变频器的额定参数。(1)入侧的额定参数。①额定电压→低压变频器的额定电压有单相220~240V(主要是家用电器中的小容量变频器)，三相220V或380~460V。
我国低压变频器的额定电压多为三相380V，中高压变频器的额定电压有3kV、6kV和10kV。
②额定频率→一般规定为工频50Hz或60Hz，我国为50Hz。(2)输出侧的额定参数。
①额定输出电压→由于变频器的输出电压是随频率变化的，所以其额定输出电压只能规定为输出电压中的最大值，通常它总是和输入侧的额定电压相等。②额定输出电流→额定输出电流指允许长时间输出的最大电流，是用户选择变频器的主要依据。
③额定输出容量→额定输出容量由额定输出电压和额定输出电流的乘积决定:。Se=√3UeIex10?3。式中的S额定输出量，kVA；Ue额定输出电压，V；Ic额定输出电流，A。需指出:变频器的额定容量有以额定输出电流(A)表示的，有以额定有功功率(kw)表示的，也有以额定视在功率(kVA)表示的。
★变频器虽然具有软启动、软停车、无级调速以及特殊要求的增、减特性等，具有过载、过压、欠压、短路、接地等保护功能及各种预警、预报信息和状态信息及诊断功能；但如果变频器与电机功率匹配没有正确选择，或者没有正确地设置最基本参数选择，出现电机烧了，而变频器仍然还有输出；这种情况一般不会出现在熟悉变频器的老师傅们的工作中。简单地说，正确设置变频器与电机的参数，例如：额定功率、额定频率、额定电压、额定电流、额定输出容量等是确保变频器正常工作，且充分发挥其变频器及电机性能的前提，而掌握基本参数设定的操作方法是操作变频器的关键所在环节。
无论什么品牌变频器与电机，在选择功率匹配一致情况下，都要进行对其电机参数进行自学习（也俗称自动调谐），它是将变频器拖地的电机铭牌是上的参数准确的复制给变频器内部的存储器芯片；电机参数复制到变频器内部包括参数上传和参数下载两个步骤，其中参数上传是指将变频器控制板中的参数上传到操作显示板的存储器（EEPROM）中进行保存；参数下载是指将操作显示面板中存储的参数下载到变频器的控制板中，并且进行保存。
PC-E984-685 SCHNEIDER 变频器
PC-E984-685 SCHNEIDER inverter rated parameters. (1) Rated parameters of the inlet side. ① Rated voltage → Low-voltage inverter rated voltage has single-phase 220~240V(mainly small capacity inverter in household appliances), three-phase 220V or 380~460V.
The rated voltage of low-voltage inverter in China is mostly three-phase 380V, and the rated voltage of medium-high voltage inverter is 3kV, 6kV and 10kV.
② Rated frequency → Generally specified as power frequency 50Hz or 60Hz, our country is 50Hz. (2) Rated parameters of the output side.
① Rated output voltage → Because the output voltage of the inverter changes with the frequency, its rated output voltage can only be specified as the maximum value of the output voltage, usually it is always equal to the rated voltage on the input side. ② Rated output current → Rated output current refers to the maximum current allowed for long-term output, which is the main basis for users to choose the inverter.
③ Rated output capacity → Rated output capacity is determined by the product of rated output voltage and rated output current: Se=√3UeIex10? 3. In the formula, S rated output, kVA; Ue rated output voltage, V; Ic Rated output current, A. It should be pointed out that the rated capacity of the inverter is expressed in rated output current (A), in rated active power (kw), and in rated apparent power (kVA).
★ Although the frequency converter has soft start, soft stop, stepless speed regulation and special requirements of the increase and decrease characteristics, with overload, overvoltage, undervoltage, short circuit, grounding and other protection functions and a variety of early warning, forecasting information and status information and diagnostic functions; However, if the inverter and the motor power match is not correctly selected, or the most basic parameter selection is not correctly set, the motor burns, and the inverter still has output; This situation generally does not appear in the work of the old masters who are familiar with the frequency converter. Simply put, the correct setting of the parameters of the inverter and the motor, such as: rated power, rated frequency, rated voltage, rated current, rated output capacity, etc., is to ensure the normal operation of the inverter, and give full play to the performance of the inverter and the motor, and master the basic parameter setting operation method is the key link in the operation of the inverter.
No matter what brand of inverter and motor, in the case of power matching, it is necessary to carry out self-learning of its motor parameters (also known as automatic tuning), which is to accurately copy the parameters on the motor nameplate of the inverter to the memory chip inside the inverter; The copying of motor parameters to the inverter includes two steps: parameter uploading and parameter downloading. Parameter uploading refers to uploading the parameters in the inverter control board to the memory (EEPROM) of the operation display board for saving. Parameter download means to download the parameters stored in the operation display panel to the control board of the inverter and save them.
PC-E984-685 SCHNEIDER 变频器
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