There are many setting parameters of the inverter, and each parameter has a certain selection scale, and the inverter can not operate normally due to the improper setting of a single parameter is often encountered in the application, therefore, the relevant parameters must be correctly set.
1. Manipulation methods
i.e. speed control, rotation control, PID control, or other methods. After adopting the control method, static or dynamic identification is generally carried out according to the control accuracy.
2. Low operating frequency
That is, the small speed of motor operation, when the motor is operating at low speed, its heat dissipation function is very poor, and the motor will be operated at low speed for a long time, which will cause the motor to burn out. And at low speeds, the current in the cable will also increase, which will also cause the cable to heat up.
3. High operating frequency
The general frequency converter has a large frequency to 60Hz, and some even to 400 Hz, and the high frequency will make the motor work at high speed, which is for ordinary motors, and its bearings can not be operated at a long-term over-rated speed, whether the rotor of the motor can withstand such centrifugal force.
4. Carrier frequency
The higher the carrier frequency setting, the larger the higher harmonic component, which is closely related to the length of the cable, the heating of the motor, the heating of the cable and the heating of the inverter.
5. Motor parameters
The inverter sets the power, current, voltage, speed, and maximum frequency of the motor in the parameters, and these parameters can be directly obtained from the motor nameplate.
6. Frequency hopping
At a certain frequency point, there is a possibility of resonance, especially when the whole device is relatively high; When operating the compressor, avoid the surge point of the compressor.
7. Acceleration and deceleration moments
The acceleration time is the time required for the output frequency to rise from 0 to the highest frequency, and the deceleration time is the time required to decrease from the largest frequency to 0. Acceleration and deceleration times are usually confirmed by the rise and fall of the frequency setting signal. 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 investigate 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 operation is not generated as the criterion, and the operation is repeated several times to confirm the best acceleration and deceleration time.
8. Torque increase
Also known as torque compensation, it is a method to increase the low-frequency scale 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 active, the voltage at the time of acceleration can be actively increased to compensate for the starting torque, so that the motor can be accelerated smoothly. If manual compensation is used, the best curve can be selected according to the load characteristics, especially the starting characteristics of the load. Regarding the variable torque load, if it is not selected properly, the output voltage at low speed will be too high, and the electric energy will be wasted, and even the current will be large when the motor is started with load, and the speed cannot go up.
9. Electronic thermal overload maintenance
This function is set to maintain the overheating of the motor, which is that the CPU in the inverter calculates the temperature rise of the motor according to the operating current value and frequency, and then performs overheating maintenance. 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 Maintenance Setpoint (%) = [Motor Rated Current (A) / Inverter Rated Output Current (A)]×100%.
10. Frequency Constraints
That is, the upper and lower amplitudes of the output frequency of the inverter. Frequency constraint is a maintenance function to avoid misoperation or external frequency setting signal source problems, and the output frequency is too high or too low, so as to prevent damage to the equipment. In use, it can be set according to the actual situation. This function can also be used for speed limiting, such as belt conveyor, because the transport material is not too much, in order to reduce the wear and tear of machinery and belt, the inverter can be driven, and the upper frequency of the inverter is set to a certain frequency value, so that the belt conveyor can operate at a fixed, lower operating speed.
11. Bias frequency
Some are also known as error frequency or frequency error setting. Its purpose is to adjust the frequency to set the bump of the output frequency when the signal is low when the frequency is set by an external analog signal (voltage or current). When the frequency setting signal is 0%, the error value can be in the scale 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 the debugging, then the bias frequency can be set to negative xHz to make the output frequency of the inverter 0Hz.
12. Frequency setting 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) of the inverter; When the imitation input signal is large (such as 10v, 5v or 20mA), find the frequency percentage that can output the f/V graph and set it 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%.
13. Torque constraint
There are two types of driving torque constraint and brake torque restraint. It is based on the output voltage and current values of the inverter, and the torque is calculated by the CPU, which can significantly improve the shock load recovery characteristics during acceleration and deceleration and constant speed operation. The torque restraint function enables active acceleration and deceleration control. Assuming that the acceleration and deceleration time is less than the load inertia time, the motor can also be ensured to actively accelerate and decelerate according to the torque set value.
The driving torque function provides a strong starting torque, in the steady-state operation, the torque function will control the motor to deteriorate, and the motor torque is constrained within the largest set value, when the load torque suddenly increases, and even when the acceleration time is set too short, it will not cause the inverter to trip. When the acceleration time is set too short, the motor torque will not exceed the maximum set value. A large drive torque is good for starting, so it is better to set it to 80 - 100%.
The smaller the braking torque setting value, the greater the braking force, which is suitable for the occasion of rapid acceleration and deceleration, such as the overvoltage alarm phenomenon when the braking torque setting value is set too much. If the braking torque is set to 0%, the total amount of regeneration applied to the main capacitor can be close to 0, and then the motor can be decelerated to a stop without using a braking resistor when decelerating. However, on some loads, such as when the braking torque is set to 0%, there will be a short idling phenomenon when decelerating, resulting in repeated start of the inverter, a large fluctuation of the current, and in serious cases, the inverter will trip, which should be noted.
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