The correct maintenance method of Mitsubishi Frequency converter

In addition to the regular maintenance of the frequency converter module, we should regularly check the Mitsubishi frequency converter module, especially the maintenance of the cooling fan. Because of the large power and high speed of the cooling fan, in the dusty working environment, it simply leads to the blockage of the radiator vent, which makes the internal circuit board dirty, the failure of the heat dissipation silicone grease, and the shortening of the life of the Mitsubishi frequency converter radiator.

1. Avoid the disturbance of Mitsubishi frequency converter

The Mitsubishi inverter operates like a powerful spoiler, the source of which is the six IGBT tubes in the output module. The switching power supply of some Mitsubishi frequency converter will also form a certain amount of interference. The power line and motor line are the antennas of the scrambler. If the ground wire is poorly grounded, the interference signal can also be sent out through the ground wire connected to the shell, and the longer the line, the larger the disturbance scale. The disturbance signal of the Mitsubishi converter disturbs not only the surrounding electronics, but also the Mitsubishi converter itself. Some Mitsubishi converters themselves have the function of avoiding interference signal radiation and input, and some Mitsubishi converters have no anti-interference function. If the control system uses Mitsubishi frequency converter at the same time as some electronic equipment that depends on analog signal and pulse signal communication, such as computer, human-machine interface, inductor, etc., anti-disturbance measures should be considered when purchasing Mitsubishi frequency converter and wiring.

Two, try not to install the frequency converter on the sensational equipment

When the Mitsubishi inverter is installed on the sensational equipment running for a period of time, the connecting screws of the main loop and the fastening screws of the module are simply loosened, and then the service life of the inverter is shortened. And when the equipment is sensational, the module of the converter is simply damaged. If the frequency converter must be installed around the sensational equipment, the connecting screws of the loop and the fastening screws of the module should be checked regularly to avoid the damage of the frequency converter due to the loosening of the screws.

Three, to have outstanding grounding wire

Factory ground wires rarely break, but when they do, Mitsubishi drives are simply burned out. Because if there is a motor leakage, and just the ground wire of the factory is broken, the strong electricity will be transfixed into the Mitsubishi frequency converter motherboard, so that the mainboard wiring end of the strong electric spark, burn out the motherboard. So, have a good grounding wire.

Four, Mitsubishi inverter input end of the air switch to pressure sensitive resistor

The quality of power supply in some enterprises is not very high. When the power supply line is faulty, the high voltage output simply burns out the Mitsubishi frequency converter and related electronic instruments. In order to solve this problem, passive maintenance method can be adopted, that is, the transducer or instrument input air switch on the pressure sensitive resistor (380V with 821K, 220V471K), when there is high voltage, pressure sensitive will short circuit, air switch trip, and then maintain the converter. It should be noted that the varistor should not be too close to the frequency converter, because when the varistor short-circuit blasting, the metal fragments will fly everywhere, and the powerful electrostatic and electromagnetic waves emitted during blasting will affect the function of the frequency converter. Therefore, it is better to put another pressure sensitive resistor outside the frequency converter.

5. Replace the Mitsubishi frequency converter motherboard

Mitsubishi frequency converter is afraid of motherboard damage, motherboard damage caused by many reasons, such as high environmental temperature, static electricity, large disturbance (such as near the contactor often action), module blasting, powerful electromagnetic wave, switching power supply problems are also simple to burn the frequency converter motherboard.