There are many setting parameters of the inverter, each parameter has a certain selection range, and the phenomenon that the inverter can not operate normally is often encountered in the application due to the improper setting of a single parameter, so the relevant parameters must be set correctly.
1. Manipulation method
i.e. speed manipulation, rotation distance manipulation, PID manipulation, or other methods. After adopting the control method, it is generally necessary to perform static or dynamic identification according to the control accuracy.
2.*** Low working frequency
That is, the motor works at a small speed, when the motor works at a low speed, its heat dissipation performance is very poor, and the motor works at a 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 working 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 the general motor, its bearing can not work at a long-term over-rated speed, and whether the rotor of the motor can accept such centrifugal force.
4. Carrier frequency
The higher the carrier frequency setting, the greater the weight of the higher harmonics, 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, resonance may occur, especially when the whole device is relatively high; When operating the compressor, it is necessary to prevent 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 is accelerating, the rise rate of the frequency setting must be constrained to prevent overcurrent, and when the motor is decelerating, the fall rate must be constrained to prevent 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 points of the deceleration time setting are: to prevent the voltage of the lubricating circuit from being too large, 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 alarm does not occur in the work 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 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 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 phenomenon of wasting electric energy will be presented, and even the phenomenon that the current is large when the motor is started with a 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 working 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 restriction is a maintenance function to prevent misoperation or external frequency setting signal source from malfunctioning, which causes the output frequency to be 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 the belt conveyor, because the 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 work at a fixed, lower operating speed.
11. Bias frequency
Some are also known as deviation frequency or frequency deviation setting. Its purpose is to adjust the output frequency when the frequency is set by an external analog signal (voltage or current), and the output frequency can be adjusted when the frequency setting signal is low. When the frequency setting signal is 0%, the deviation value can be 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 the debugging, then the bias frequency can be set to negative xHz at this moment 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; At the same time, it is convenient to imitate the selection of the set signal voltage, set the punctuality, 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 guaranteed to actively accelerate and decelerate according to the torque setting 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, 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%, the phenomenon of short time and idle will appear when decelerating, resulting in repeated start of the inverter, and the current will fluctuate greatly, and the inverter will trip when it is severe, which should be noted.
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