The first step is not to turn on electricity! First open the inverter panel, wipe the inverter dry, and then use a hair dryer to dry the display, PC board, push board, power components, fans, etc., with 95% alcohol, scrub the components with 95% alcohol, and dry the hair dryer with cold air.
The second step, after one hour, scrub with alcohol again and dry with a hair dryer. Alcohol volatilization takes away most of the moisture. Turn on the hot air (low setting) and blow it again. Focus on drying the following components: potentiometer switching power transformer, indicator (button), relay, contactor, reactor, fan (especially 220V), electrolytic capacitor, power module, must be dried at low temperature for many times, switching power transformer, contactor, power module is the focus. Sometimes the module looks dry, but there is still water inside. - Check again after a few days - below, if there is any place for moisture return, and dry the heavy elements throughout. After drying, the first power must be sent and disconnected, depending on the inverter's reflection.
If there is no abnormality, the power will be sent again. As long as the inverter is not energized when the water is injected, the frequency converter is generally not broken.
There are many kinds of production machinery, different performance and process requirements, and different torque characteristics, so before applying the inverter, we must first understand the nature of the load carried by the motor, that is, the load characteristics, and then select the inverter and the motor.
There are three types of loads:
Constant torque load, fan pump load, constant power load.
(1) Constant merit
Constant power load refers to a load where the torque is inversely proportional to the speed, but the power remains constant, such as coilers, machine tools, etc. When the inverter is used for the load with constant power characteristics, it should be noted: the output voltage of the inverter is controlled by a fixed value in the frequency range above the power frequency, so the torque generated by the motor is the constant power characteristic, and there is no problem with the combination of standard motor and general inverter. In the frequency range below the power frequency, it is controlled by U/f fixed value, and the torque generated by the motor is opposite to the load torque, and the combination of standard motor and general inverter is difficult to adapt, so it is necessary to design specially.
(2) Fan pump load
The negative pump air load is a typical square torque load, the load is very small at low speed, and is proportional to the square of the speed, the combination of the inverter and the standard motor is the most suitable. This kind of load does not have high requirements for the performance of the inverter, only requires economy and reliability, so the inverter with U/f=const control mode can be selected. If the output frequency of the inverter is increased above the power frequency, the power increases sharply, sometimes exceeding the capacity of the motor inverter, resulting in the motor overheating or unable to operate, so do not easily increase the frequency to above the power frequency for the load torque.
(3) Constant torque load
Constant torque load is divided into friction load and potential load. The starting torque of friction class load generally requires about 150% of the rated torque, and the braking torque generally requires about 100% of the rated torque, so the inverter should choose a frequency converter with constant torque characteristics, and the starting and braking torque are relatively large, and the overload time and overload capacity are large.
The potential energy load generally requires a large starting torque and energy feedback function, which can quickly realize forward and reverse rotation, and the inverter should choose a frequency converter with four-quadrant operation ability.
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