Time：2019.01.04 15:38 View： Anthor：adminBack
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.
Control mode: speed control, torque control, PID control or other means. After the control method is adopted, static or dynamic identification is generally performed according to the control precision.
The lowest operating frequency: that is, the minimum running speed of the motor. When the motor runs at low speed, its heat dissipation performance is very poor. When the motor runs at low speed for a long time, the motor will burn out. At low speeds, the current in the cable also increases, which can also cause the cable to heat up.
Maximum operating frequency: The general frequency of the inverter is up to 60Hz, and some even reach 400 Hz. The high frequency will make the motor run at high speed. For ordinary motors, the bearings cannot run for a long time at the rated speed. Is the rotor of the motor? Can withstand such centrifugal force.
Carrier frequency: The higher the carrier frequency setting, the higher the higher harmonic component, which is closely related to the length of the cable, the heating of the motor, and the heating of the cable heating inverter.
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.
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.
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 stator winding resistance 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 load, 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 not high.
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