There will be some difference between the parameter setting of the inverter at the factory and the requirements of practical application. Therefore, the reasonable setting of the inverter parameters is directly related to whether the inverter can be used normally, which is of decisive significance.
In practical application, there is no need to set and debug every parameter of the inverter, and most of them only need to select the factory setting value. However, some parameters are very related to the use of practice, and some are also related to each other, so they should be set and debugged according to practice. The parameters set for general requirements are:
First, the selection of work instructions
There are generally three ways to do a job order. That is: keyboard work, terminal work, RS-485 work, selected according to practical needs.
Second, the frequency setting method selection:
Generally, there are: numeric keypad, keyboard potentiometer, external imitation signal terminal, external rising and falling terminal, RS485, selected according to practical needs.
3. Acceleration and deceleration time
The acceleration time is the time it takes for the output frequency to rise from 0 to the maximum frequency, and the deceleration time is the time it takes for the output frequency to drop from the maximum frequency to 0. Generally, the frequency setting signal rises and falls to determine the acceleration and deceleration time. When the motor accelerates, the rise rate of the frequency setting must be constrained to avoid overcurrent, and when the motor is decelerating, the fall rate must be constrained to avoid overvoltage.
Speed up the time setting requirements: the acceleration current is constrained below the overcurrent capacity of the inverter, so that the overflow will not cause the inverter to trip; The key to setting the deceleration time is to avoid excessive voltage of the smoothing circuit, and not to cause the regenerative overvoltage to stall and trip the inverter. The acceleration and deceleration time can be calculated according to the load, but in the debugging, it is often used to set a longer acceleration and deceleration time according to the load and experience, and observe whether there is an overcurrent and overvoltage alarm after starting and stopping the motor; Then, the acceleration and deceleration time is gradually shortened, and the optimal acceleration and deceleration time can be determined by repeating the operation several times according to the criterion that no alarm occurs during the operation.
Fourth, the output frequency constraint
That is, the upper and lower amplitudes of the output frequency of the inverter. Frequency restriction is a protective function to avoid misoperation or failure of the external frequency setting signal source, which causes the output frequency to be too high or too low, so as to prevent damage to the equipment. In the app, you can set it according to the practical situation. This function can also be used for speed limiting, such as air compressor frequency conversion constant pressure gas supply, because when the gas consumption is small, the frequency of the inverter operation will decrease, so as to adhere to the constant pressure and save electricity. However, it has been declining, and it will affect the smooth system of the air compressor, and the lower frequency limit of the inverter is set to a certain frequency value, which can not only save electricity, but also ensure the normal operation of the air compressor.
5. Torque compensation
Also known as torque increase, it is a method to increase the low frequency range f/V in order to compensate for the decrease in torque at low speed caused by the resistance of the stator winding of the motor. When set to automatic, the voltage at acceleration can be automatically increased to compensate for the starting torque, so that the motor can be accelerated smoothly. If manual compensation is selected, the best curve can be selected according to the load characteristics, especially the starting characteristics of the load. For variable torque loads, if the selection is not done properly, the output voltage at low speed will be too high, and the phenomenon of wasting electric energy will be wasted, and even the phenomenon that the current is large when the motor is started with load, and the speed cannot go up.
6. Motor overload protection method
This function is set to protect the motor from overheating, which is to calculate the temperature rise of the motor according to the operating current value and frequency of the CPU in the inverter, so as to carry out overheating protection. This function is only applicable to the occasion of "one to one", and in the case of "one to many", thermal relays should be installed on each motor. Electronic thermal protection setting value (%) = [motor rated current (A) / inverter rated output current (A)>× 100%.
7. Frequency input signal bias
Some are also known as error frequency or frequency error setting. It is used to adjust the frequency to set the output frequency when the signal is set by an external analog signal (voltage or current), as shown in Figure 1. When the frequency setting signal of some inverters is 0%, the error value can act in the range of 0-fmax, and some inverters (such as Mingdianshe and Sanken) can also set the bias polarity. If the output frequency of the inverter is not 0Hz but xHz when the frequency setting signal is 0% in debugging, then the bias frequency is set to negative xHz at this moment to make the output frequency of the inverter 0Hz. 8. Frequency setting input signal gain This function is only useful when setting the frequency with an external analog signal. It is used to compensate for the inconsistency between the externally set signal voltage and the internal voltage (+10V) in the inverter; When the imitation input signal is the maximum (such as 10v, 5v or 20mA), the frequency percentage that can output the f/V graph can be calculated and set as a parameter. If the external setting signal is 0-5V, if the output frequency of the inverter is 0-50Hz, the gain signal can be set to 200%.
Many other functions can be set according to the needs of the practice. Of course, the function codes of different inverter function parameters are also inconsistent, but you only need to find the corresponding settings according to your practical needs.
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