The inverter has many set parameters, each of which has a certain selection range. In the process of use, it is often encountered that the inverter cannot operate normally due to improper parameter settings. Therefore, the relevant parameters must be corrected.
A. Control method: speed control, distance control, PID control or other methods. After the control method is selected, static or dynamic identification is generally carried out according to the control accuracy.
B. Minimum operating frequency: that is, the minimum speed of the motor. When the motor is running at low speed, the heat dissipation function is very poor. When the motor runs at low speed for a long time, it will cause the motor to burn out. At low speeds, in their cables. The current also increases, which also causes the cable to heat up.
C. Maximum operating frequency: the maximum frequency of the general inverter is 60Hz, and some even reach 400Hz, and the high frequency will make the motor run at high speed, which is for ordinary motors, and its bearings can not run at extra speed for a long time. Whether the motor rotor can withstand such centrifugal forces.
D. Carrier frequency: The higher the carrier frequency, 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 inverter and other factors.
E. Motor parameters: The inverter sets the parameters of motor power, current, voltage, speed and maximum frequency, which can be obtained directly from the motor nameplate.
F. Frequency hopping: Resonance may occur at a certain frequency point, especially when the whole equipment is relatively high, and the surge point of the compressor should be avoided when operating the compressor. There are many functional parameters of the inverter, and there are dozens or even hundreds of parameters that users can select. In practice, there is no need to set and debug each parameter. Most of them only need to use factory set values. _1 acceleration and deceleration moment.
The acceleration moment is the moment it takes for the output frequency to rise from _0 to the maximum frequency, and the deceleration moment is the moment it takes for the output frequency to drop from the maximum frequency to 0. Generally, the acceleration and deceleration moments are determined by the rise and fall of the signal set by the frequency.
When the motor accelerates, the rising speed of the frequency setting should be constrained to avoid overcurrent; When decelerating, the drop rate should 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 be lost.
The key point in setting the deceleration time is to avoid the overvoltage of the slippery circuit that will cause the regenerative overvoltage to be blocked, causing the inverter to trip. Acceleration and deceleration moments can be calculated based on load, but they are often negative in commissioning. Load and experience: First, set a long acceleration and deceleration time, and observe whether there is an overcurrent and overvoltage alarm by starting and stopping the motor; Then the acceleration and deceleration setting time is gradually shortened, and the operation is repeated several times according to the principle of no alarm. The optimal moment of acceleration and deceleration can be determined.
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