The parameter setting of the inverter is very important during the commissioning process. Many users who use the inverter for the first time, because they do not fully understand the meaning of these parameters, plus more listed setting parameters, there are some overwhelming how to set the parameters of the inverter. For these users, you need to master the basic knowledge of the inverter parameter setting: which parameters need to be set before the test run; which parameters need to be adjusted during operation and the appropriate range of adjustment; how to prevent the frequency conversion caused by improper parameter setting during the debugging process Damage to the device and so on.
Classification of inverter parameters
1, do not have to adjust the parameters that can maintain the factory settings
2. Pre-set parameters before commissioning
3. Parameters that need to be adjusted during trial operation
Commonly used inverter parameters are
1. Control method:
2. Minimum operating frequency:
3, the highest operating frequency:
4, carrier frequency:
5, motor parameters:
6, frequency hopping:
7, acceleration and deceleration time
8, torque boost
9, electronic thermal overload protection
10, frequency limit
11, bias frequency
12, frequency setting signal gain
13, torque limit
Inverter parameter setting (1)
There are many setting parameters of the inverter, each parameter has a certain range of selection. In use, it is often encountered that the inverter cannot work normally due to improper setting of individual parameters. Therefore, the relevant parameters must be correctly set. set.
1. Control mode: speed control, torque control, PID control or other methods. After the control method is adopted, static or dynamic identification is generally performed according to the control precision.
2, the lowest operating frequency: that is, the minimum speed of the motor running, when the motor is running 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. At low speeds, the current in the cable also increases, which can also cause the cable to heat up.
3, the highest operating frequency: the general frequency of the inverter to 60Hz, and some even to 400 Hz, high frequency will make the motor run at high speed, this for ordinary motors, its bearings can not run for a long time at the super rated speed, the motor Whether the rotor can withstand such centrifugal force.
4, carrier frequency: the higher the carrier frequency setting, the higher the higher harmonic component, which is closely related to the cable length, motor heating, cable heating inverter heating and other factors.
5. Motor parameters: The inverter sets the power, current, voltage, speed and maximum frequency of the motor in the parameters. 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 controlling the compressor, avoid the surge point of the compressor.
Inverter parameter setting (2)
There are many function parameters of the inverter, generally there are dozens or even hundreds of parameters for the user to choose. In practical applications, it is not necessary to set and debug each parameter, and most of them only need to adopt the factory setting value.
First, acceleration and deceleration time
The acceleration time is the time required for the output frequency to rise from 0 to the maximum frequency, and the deceleration time is the time required to fall from the maximum frequency to 0. The acceleration and deceleration time is usually determined by the frequency setting signal rising and falling. When the motor is accelerating, the rate of increase of the frequency setting must be limited to prevent overcurrent, and when decelerating, the rate of decrease is limited to prevent overvoltage.
Acceleration time setting requirement: Limit the acceleration current below the overcurrent capacity of the inverter, and do not cause the inverter to trip due to the over-speed. The deceleration time setting point is: prevent the smoothing circuit voltage from being too large, and do not make the regenerative overvoltage stall. Let the frequency converter trip. Acceleration and deceleration time can be calculated according to the load, but in the debugging, it is often set to set the long acceleration/deceleration time according to the load and experience. Observe the overcurrent and overvoltage alarm by starting and stopping the motor; then gradually set the acceleration/deceleration time. Shorten, the principle of no alarm occurs during operation, and repeat the operation several times to determine the optimal acceleration and deceleration time.
Second, the torque boost
Also called torque compensation, it is a method to increase the low frequency range f/V to compensate for the torque reduction at low speed caused by the resistance of the stator winding of the motor. When set to automatic, the voltage during acceleration can be automatically increased to compensate for the starting torque, so that the motor accelerates smoothly. If manual compensation is used, a better curve can be selected by experiment depending on the load characteristics, especially the starting characteristics of the load. For variable torque loads, if the selection is improper, the output voltage will be too high at low speed, and the phenomenon of wasting electric energy may even occur when the motor is loaded with load and the current is large, and the speed is not going up.
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