How to set the inverter parameters
1. Motor-related parameters
The inverter serves the motor , the inverter and the motor must be used together, that is, the rated voltage and rated power of the two must be very close. During the operation of the motor, to avoid overheating and burning due to excessive current, some relevant protection parameters need to be set.
1. Rated voltage
Although the voltage of motors controlled by inverters in China is basically three-phase 380 volts, it is not ruled out that some Imported equipment is special. If you replace the inverter, you should pay attention. For example, the one coming from Japan may be three-phase 220 volts.
2. Rated current
This parameter is on the motor nameplate, just enter it accordingly.
3. Overload protection
This is actually a parameter that controls the instantaneous maximum power. The common value is 110%, which can be increased to 150%, depending on the actual situation. Condition.
4. Overcurrent protection
This is the maximum instantaneous output current, for example, 150%. If you are worried about motor problems, you can set it to 100% .
5. Upper limit frequency
China generally uses 50HZ, but some occasions require overclocking, such as some machine tool spindles, which may be as early as 75HZ. According to Choose according to the working conditions, but it should not be too high, otherwise the motor bearings cannot bear it.
6. Starting frequency
The inverter is often unable to output a very low frequency to drive the motor, and is usually higher than 0.5HZ at startup.
2. Power supply parameters
1 , Torque boost
There are automatic and manual modes to choose from. If the automatic mode is not effective, you can choose the manual mode, which essentially sets the V/F ratio.
2. Torque enhancement
Considering that the motor torque is insufficient at low speed, it is necessary to increase the torque in some cases.Lower the voltage value, this is the so-called torque enhancement, but it cannot be increased too much, otherwise it may become unstable.
3. Acceleration and deceleration time
Theoretically, the shorter the acceleration and deceleration time of the frequency converter, the greater the fluctuation of the motor current and voltage. However, in many cases, the motor needs to be accelerated. The deceleration time is shorter, so this needs to be set according to the load.
4. Control mode
Generally, general-purpose loads can use V/F mode. If it is vector control, you can choose non-inductive vector or inductive vector. Vector is set according to the control accuracy. If vector control is selected, the parameters need to be adjusted adaptively.
3. Human-machine control parameters
The inverter must be controlled and operated by humans, such as starting it, stopping it, and letting it How fast to run, how to slow it down, etc. all need to be set.
1. Startup source
This contains the start and stop functions. If controlled through I/O, you can select the corresponding I/O port. Most frequency converters have a fixed I/O, and can also be controlled by setting the panel, and some are even controlled by communication.
2. Frequency source
It is the same as the startup source, but the frequency source is often in the form of analog quantities, including voltage and current forms, and some In some cases, multi-stage speed control is achieved through multiple I/Os, which can also be accomplished through communication methods.
3. Display type
The panel can switch to display parameters such as current, voltage, frequency or speed, depending on the needs.
4. Other parameters
1. Control method
That is, speed control, torque control, PID control or other methods. After the control method is adopted, static or dynamic identification is generally performed based on the control accuracy.
2. Minimum operating frequency
That is, the minimum speed at which the motor runs. When the motor runs at low speed, its heat dissipation performance is very poor. , the motor running at low speed for a long time will cause the motor to burn out. Moreover, at low speed, the current in the cable will also increase, which will also cause the cable to heat up.
3. Maximum operating frequency
The maximum frequency of general inverters is 60Hz, and some even reach 400Hz. High frequency will make the motor run at high speed. For ordinary motors, their bearings cannot operate at over-rated speeds for a long time. Can the rotor of the motor withstand such centrifugal force?force.
4. Carrier frequency
The higher the carrier frequency is set, the greater the high-order harmonic component will be. This is related to the length of the cable, the heat generated by the motor, and the cable Heating factors such as inverter heating are closely related.
5. Frequency hopping
At a certain frequency point, resonance may occur, especially When the entire device is relatively high; when controlling the compressor, avoid the surge point of the compressor.
Statement: The above content is provided by the program system index or shared by netizens. It is for your reference only and does not represent the research views of this website. Please pay attention to the authenticity and authority of the source of the content. . Apply for deletion >> Correction >>
If the website content violates your rights, please contact us to delete it。
