1. UVT problem
UVT is an under-voltage problem, and I believe that many customers will still encounter such problems in use.
The common undervoltage detection point of Mitsubishi inverter is the voltage on the DC bus side, and a low voltage value is sampled after dividing the voltage by the large resistance resistor, and the output voltage normal signal, overvoltage signal or undervoltage signal is compared with the standard voltage value. The sampling value of the voltage signal of the Mitsubishi A500 series inverter is obtained from the switching power supply side, and is blocked by the photocoupler.
2. E6, E7 issues
E6, E7 problems must be no stranger to the vast number of users, this is a more common Mitsubishi inverter typical problems, of course, the cause of damage is also multifaceted.
(1) 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 signal presentation problem of this integrated circuit may cause E6 and E7 alarms;
(2) The signal blocking optocoupler is damaged. There are multiple strong and weak signals that need to be blocked between the IC integrated circuit 1302H02 and the CPU board, and the damage of the blocking optocoupler is still relatively high in the damage share of the element, so when presenting E6 and E7 alarms, it is also necessary to consider whether it is formed by such factors;
(3) The connector is damaged or the connector is in poor contact. Because the connection cable between the CPU board and the power board is simply broken after several twists and turns, and the plug pins are tortuously broken if used improperly on the plug side. Some of the above reasons may also lead to the presentation of E6 and E7 problems.
3. Common series of product problems
The A700 series, E700 series, F700 series and D700 series are being implemented in the market.
(1) For the A700 series, there are times when there is a UV (undervoltage) problem, so please check the rectifier circuit. The rectifier bridge of the A700 series inverter below 7.5kW has a built-in thyristor, which is used to cut off the charging resistance during normal operation, and the damage of the built-in thyristor will lead to the appearance of undervoltage problems. Switching power supply damage is also a common problem for A700 series inverters, and the common damage equipment is an M51996 waveform generator chip, which is usually caused by sudden changes in the operating voltage. The simpler local problems are mainly the power supply with 14 pins of the chip, 7 pins to adjust the voltage reference value, 5 pins to feedback detection, and 2 pins to the waveform output. In addition, during the usual repair, the CPU board will often be damaged. Common problem alarms are E6 and E7, and the damaged equipment is mainly concentrated in the program memory chip of the CPU board and some interface chips.
(2) About the E700 series inverter, the common problem encountered is the Fn problem, which is mainly caused by the damage of the fan. However, the inverter does not enclose the output when there is an alarm.
Damage to the power module is also the first to be seen in the E700 series inverter. Regarding the low-power inverter, because it is an intelligent module that integrates power equipment and detection circuit, it can only be replaced when the module is damaged, but the repair cost is high and there is no repair value. As for the 5.5KW and 7.5KW E500 series inverters, the 7MBR series PIM power modules are selected, and the replacement cost is relatively low, and some repairs can be made to the damage of such inverters.
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