The most widely used Mitsubishi inverters in the market are the A500 series and the E500 series. The A500 series is a general-purpose inverter suitable for high starting torque and high dynamic response applications. The E500 series is suitable for applications where the functional requirements are simple and the dynamic performance requirements are low, and the price is superior. Do some brief introductions on some of the new faults and corresponding treatments of the two models that Mitsubishi inverters use most widely in the market.
OC1, OC3 are faulty. Mitsubishi inverter OC (overcurrent fault) is often caused by the following reasons (now A500 series inverter as an example). (1) caused by improper parameter setting, such as time setting is too short; (2) caused by external factors, such as short circuit of motor winding, including (phase-to-phase short circuit, short circuit to ground, etc.); (3) Inverter hardware failure, such as Huo Damage to the sensor, damage to the IGBT module, etc.
In the current maintenance, we sometimes rule out the above reasons may not solve the problem, OC failure still exists, of course, replacing the control board is not the solution to the problem, then you can consider whether there is a problem with the drive circuit. The detection circuit of the Mitsubishi A500 inverter is quite powerful. If any of the above detection points have any problem, it may alarm and cannot operate normally. In addition to the driving power supply included in the general driving circuit, the driving optocoupler is isolated, the driving signal amplifying circuit, and the output signal feedback circuit are also included. In the case that the detection method we introduced before can not solve the problem, we must pay special attention to whether the drive circuit is normal. The detection direction mainly includes several components of the Mitsubishi drive circuit just introduced.
UVT failure. UVT is an undervoltage fault. It is believed that many customers will still encounter such problems during use. Our common undervoltage detection points are the voltage on the DC bus side, and a low voltage value is sampled after being divided by a large resistance resistor. After the standard voltage value is compared, the output voltage is normal, the overvoltage signal or the undervoltage signal. The sampling value of the voltage signal of Mitsubishi A500 series inverter is obtained from the switching power supply side and is isolated by the optocoupler. During our maintenance process, it is found that the damage of the optocoupler occupies very much in the cause of the undervoltage fault. The large proportion, this phenomenon is still rare in the previous inverter repair.
E6, E7 is faulty. E6, E7 failure is no stranger to the majority of users, this is a typical Mitsubishi inverter typical failure, of course, the cause of damage is also multifaceted. (1) The integrated circuit 1302H02 is damaged. This is an IC integrated circuit that integrates drive waveform conversion and multi-channel detection signals, and has multiple signals associated with the CPU board. In many cases, any one of the signals of this integrated circuit may cause E6. , E7 alarm; (2) signal isolation optocoupler damage. There are multiple strong and weak signals between the IC integrated circuit 1302H02 and the CPU board that need to be isolated. The damage of the isolated optocoupler is relatively high in the damage ratio of the components. Therefore, in the case of E6 and E7 alarms, it should also be considered. Whether it is caused by such factors; (3) the connector is damaged or the connector is not in good contact. Since the connecting cable between the CPU board and the power board is easily bent after a few bending, the phenomenon of soldering, etc., if the plug side is improperly used, the pin bending and breaking may occur. Some of the above reasons may also cause E6 and E7 failures.
The switching power supply is damaged. The damage of the switching power supply is also a common fault of the A500 series inverter. Excluding the pulse transformer damage that we often mentioned before, the damage of the switching FET, the damage of the starting resistor, the damage of the rectifier diode, etc., the common damage device is a piece. M51996 waveform generator chip, this is a control chip with turn-on turn-off time adjustment, output voltage regulation, voltage feedback adjustment and other protection. The most prone to problems are the power supply of the chip 14 pin, the 7-pin of the voltage reference value adjustment, the 5 pin of the feedback detection, and the 2 pin of the waveform output.
The power module is damaged. The damage of the power module mainly occurs in the E500 series inverter. For the low-power inverter, because it is an intelligent module that integrates the power device and the detection circuit, it can only be replaced when the module is damaged, but the maintenance cost is high and there is no maintenance value. For the 5.5KW, 7.5KW E500 series inverter, the PIM power module of 7MBR series is selected, the replacement cost is relatively low, and some damage can be done for the damage of such inverter. In the nearly 85 years of history, Mitsubishi Electric has been committed to the research and development of cutting-edge technology and expertise, and is engaged in the development and manufacture of high-performance products and equipment systems.
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