As the name implies, the frequency converter changes frequency. A more intuitive statement is to adjust the speed of the motor by changing the frequency.

The working principle of Mitsubishi inverter: the main circuit is the power conversion part that provides voltage regulation and frequency regulation power supply for the asynchronous motor. The filtering of the DC link is a capacitor. The current type is a frequency converter that converts the DC of the current source into an AC, and its DC loop filter is an inductance. It consists of three parts, a "rectifier" that converts power frequency power into DC power, a "smoothing loop" that absorbs the voltage pulsation generated by the converter and inverter, and an "inverter" that converts DC power to AC power Transformer".

So how to set the parameters of Mitsubishi inverter?

Mitsubishi inverter control mode: speed control, torque control, PID control or other methods. After the control method is adopted, it is generally necessary to perform static or dynamic identification according to the control accuracy.

The minimum operating frequency of the Mitsubishi inverter: that is, the minimum speed at which the motor runs. When the motor runs at a low speed, its heat dissipation performance is very poor. If the motor runs at a low speed for a long time, it will cause the motor to burn out. And at low speed, the current in the cable will also increase, which will also cause the cable to heat up.

The maximum operating frequency of the Mitsubishi inverter: the maximum frequency of the general Mitsubishi inverter is 60Hz, and some even up to 400Hz. The high frequency will make the motor run at a high speed. For ordinary motors, the bearings cannot run at an over-rated speed for a long time. Whether the rotor can withstand such centrifugal force.

Mitsubishi inverter carrier frequency: The higher the carrier frequency is set, the greater 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 other factors. The Mitsubishi 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.

Mitsubishi inverter frequency hopping: At a certain frequency point, resonance may occur, especially when the entire device is relatively high; when controlling the compressor, avoid the surge point of the compressor.

Main parameters of Mitsubishi inverter:

p01--upper limit frequency

P02--lower limit frequency

P03--reference frequency, the rated frequency of the motor

P04--high speed, frequency when RH-ON

P05--medium speed, frequency when RM-ON

P06--low speed, frequency when RL-ON

P07--acceleration time

P08--Deceleration time

P09--Electronic overcurrent protection

P13--start frequency, you can set the frequency at startup

P15--Jog frequency, set the frequency during jog operation

P77--parameter write selection,

0: Can only be written when stopped

1: Parameters cannot be written

2: Parameters can be written during operation

P78--Reversal prevention selection

0: Both forward and reverse

1: Not reversible

2: Forward rotation is not possible

P79--Operation mode selection

0: External/PU switching mode

1: PU operation mode is fixed

2: External operation mode fixed

3: External/PU combined operation mode 1, operation panel parameter setting, external (terminal STF, STR) start

4: External/PU combined operating mode 2, external input operating frequency, operation panel run/stop.

5: Switch mode

6: External operation mode, (PU operation interlock)

The above is the relevant content of "How to set the parameters of the Mitsubishi inverter?" Hope to help everyone.