Electrical characteristics view
Mitsubishi inverters that have been running and placed for a long time, due to the influence of the environment and the aging of inverter equipment, it is necessary to check and maintain the electrical performance of Mitsubishi inverters regularly. Conduct a comprehensive inspection of the input, rectifier, inverter and DC input fuses, and replace them in time if they are found to be incinerate; Carefully check whether the terminal strip is aging and loose, whether there is a hidden fault of short circuit, whether the connection of each connecting wire is firm, whether the wire skin is damaged, whether the plug of each circuit board is firm, whether the connection between the main power supply is reliable, whether there is heating and oxidation at the connection, and whether the grounding is good.
Capacitor detection
The main circuit is mainly composed of three-phase or single-phase rectifier bridge, slippery capacitor, filter capacitor, IPM inverter bridge, current limiting resistor, contactor and other components. Among them, the life of Mitsubishi inverter has an impact on the slippery aluminum electrolytic capacitor, and its life is mainly determined by the DC voltage and internal temperature added to its two ends. The type of capacitor is selected according to the supply voltage during the design of the main circuit, so the internal temperature determines the life of the electrolytic capacitor. Check whether the capacitor is leaking, the shell is expanded, bubbling or deformed, whether the safety valve is cracked, and the capacitor capacity, leakage current, withstand voltage, etc. can be tested if conditions permit, and the capacitor that does not meet the requirements can be replaced. The service life of the filter capacitor is generally 5 years, and if the use time is more than 5 years, and its objectives significantly violate the detection standards, it should be replaced as appropriate.
It is advisable to check it once every six months
In addition to daily inspection, in many viewing projects, the focus is on the slippery capacitors of the main circuit, the logic control circuit, the power supply circuit, the electrolytic capacitors in the inverter drive protection circuit, and the electric fans in the cooling system. It is difficult to measure capacitors other than those used in the main circuit, so the change in appearance and the time of operation are the first criteria for judgment. In addition, it is necessary to dust and anti-corrosion treatment of Mitsubishi inverters.
Precautions for regular maintenance
Regularly remove dust to check whether the air inlet of the fan is blocked, and clean the air filter cooling air duct and internal dust every month.
Check it regularly, it should be carried out once a year: check whether the screws, bolts and plug-ins are loose, and whether there is a short circuit in the resistance of the input and output reactors to the ground and between phases, which should be greater than tens of megaohms normally. Whether the conductor and insulator are corrosive, if so, should be scrubbed with alcohol in time. Measure the stability of the output voltage of each circuit of the switching power supply, such as: 5V, 12V, 15V, 24V and other voltages. Whether there are traces of ignition in the contacts of the contactor, and the new contactor of the same type or greater than the original capacity should be replaced severely; Acknowledging the correctness of the control voltage and conducting sequential protection action experiments; Acknowledging that there is no anomaly in the protective manifestation circuit; Acknowledging the balance of the output voltage of the inverter when operating independently.
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1. No-load energizing test of Mitsubishi inverter.
1. Ground the ground terminal of the Mitsubishi inverter.
2 Connect the power input terminal of the Mitsubishi inverter to the power supply through the leakage maintenance switch.
3 Check whether the factory display window of the Mitsubishi inverter is normal, if it is not correct.
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Mitsubishi PLC and computer communication setup method
After opening the Mitsubishi PLC programming software, select your connection method from the menu "Online" > "Transfer Settings".
1. Connect the Mitsubishi PLC to the computer first.
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(2) Unconscious operation:
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First, the control accuracy is different
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Mitsubishi inverter fault judgment method
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UVT is an under-voltage problem, and I believe that many customers will still encounter such problems in use.
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Mitsubishi PLC main maintenance and overhaul content points
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Mitsubishi PLC advantages
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