Common functional parameters of the inverter - Solutions - Huaqiang Electronic Network

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Because the functions of each type of inverter are different, and the names of the same function parameters are also inconsistent, for the convenience of description, this paper takes the basic parameter name of the general transmission as an example. Since the basic parameters are almost all types of frequency converters, it is completely possible to bypass the class.
1. Acceleration/deceleration time The acceleration time is the time required for the output frequency to rise from 0 to the maximum frequency. The deceleration time refers to the time required to fall from the maximum frequency to 0. The acceleration and deceleration time is usually determined by the frequency setting signal rising and falling. When the motor is accelerating, the rate of increase of the frequency setting must be limited to prevent overcurrent, and when decelerating, the rate of decrease is limited to prevent overvoltage.
Acceleration time setting requirement: Limit the acceleration current below the overcurrent capacity of the inverter, and do not cause the inverter to trip due to the over-speed. The main point of the deceleration time setting is to prevent the smoothing filter circuit from being too high and not to regenerate the overvoltage. The inverter is tripped. Acceleration and deceleration time can be calculated according to the load, but in the debugging, it is often set to set the long acceleration/deceleration time according to the load and experience. Observe the overcurrent and overvoltage alarm by starting and stopping the motor; then gradually set the acceleration/deceleration time. Shorten, the principle of no alarm occurs during operation, and repeat the operation several times to determine the optimal acceleration and deceleration time.
2. Torque boosting, also called torque compensation, is a method of artificially increasing the low frequency range v/f to compensate for the torque reduction at low speeds caused by the stator winding resistance of the motor. When set to automatic, the voltage during acceleration can be automatically increased to compensate for the starting torque, so that the motor accelerates smoothly. If manual compensation is used, a better curve can be selected by experiment depending on the load characteristics, especially the starting characteristics of the load. For variable torque loads, if the selection is improper, the output voltage will be too high at low speed, and the phenomenon of wasting electric energy may even occur when the motor is loaded with load and the current is large, and the speed is not going up.
3. Electronic thermal overload protection This function is set to protect the motor from overheating. It is the temperature rise of the motor calculated by the cpu in the inverter according to the running current value and frequency, thus performing overheat protection. This function is only applicable to the “one-for-one” occasion, and in the case of “one-to-one”, a thermal relay should be added to each motor.
Electronic thermal protection set value (%) = [motor rated current (a) / inverter rated output current (a)] × 100%.
4. The frequency limit is the upper and lower limit amplitude of the inverter output frequency. The frequency limit is a protection function that prevents the device from malfunctioning or the external frequency setting signal source is faulty, causing the output frequency to be too high or too low to prevent damage to the device.