Mitsubishi inverter maintenance method - Solutions - Huaqiang Electronic Network

GW MB10F 0.8A 1000V rectifier bridge

Crystal oscillator

Probe high frequency needle JTK-50L-Q has 5 needles in the high frequency needle

In order to meet the needs of the market, Mitsubishi inverters have also developed option cards for a variety of applications, including PG feedback cards that require precise speed, positioning control cards for precise positioning, and PI control cards for pressure control. Relay and transistor output cards for extended output points. The continuous enhancement of the functions of the inverter and the development of the option card have enabled Mitsubishi inverter to better meet the needs of different users and become the driving force for Mitsubishi inverters to grow rapidly.
Below we have a discussion of some common faults of Mitsubishi inverters here and the majority of users.
1. Failure of early products Because Mitsubishi inverters entered the Chinese market earlier, some old products are still in use.
Let's first analyze the failure of these products. The products we encountered in the early days mainly included the inverters of the Z series and A200 series. Low-power Z024 series inverters Our common fault phenomena are OC, ERR, no display, etc.
There are two main reasons for the cause of OC.
(1) The aging of the drive circuit due to the use of a long period of time will inevitably lead to the aging of the components, which will cause the drive waveform to be distorted, and the output voltage will be unstable, so the OC alarm will occur frequently when it is running.
(2) The damage of the IPM module can also cause the OC alarm. The power module used by the Z024 series of machines not only contains overcurrent, undervoltage and other detection circuits, but also includes an amplifier drive circuit, so no matter the damage of the detection circuit, the drive circuit damage,
And damage to high-power transistors can cause OC alarms.
(3) The cause of no display failure is mostly caused by damage to the thick film of the switching power supply.
(4) ERR fault is an undervoltage fault, usually caused by a fault in the voltage detection loop resistance or wiring, rather than the actual input voltage is really undervoltage. Most of the OC faults of the A200 series are caused by the damage of the drive circuit. Its drive circuit uses a thick film circuit in a ceramic package, which brings certain difficulties to the maintenance. The thick film circuit is mainly based on a driving light. A circuit designed to be coupled.
(5) In addition, we will encounter some LV faults. The occurrence of undervoltage faults is mostly due to the fault of the busbar detection circuit. Mitsubishi inverter also designed a thick film circuit for detecting voltage and current. The damage of the switching power supply pulse transformer is also a common fault of the A200 series inverter. The secondary winding is damaged due to the short circuit of the switching power supply output load or the sudden change of the bus voltage.
2. A500 and E500 series common faults are currently being promoted on the market are A500 series, E500 series, F500 series and S120 series. Below we will do an analysis of the common faults of the A500 and E500 series.
(1) For the A500 series, we sometimes encounter UV (undervoltage) faults, we can check the rectifier circuit. A500 series 7.5kW inverters have a built-in thyristor in the rectifier bridge. The inverter is used to cut off the charging resistor during normal operation. The damage of the built-in thyristor will cause undervoltage faults. The damage of the switching power supply is also a common fault of the A500 series inverter. The common damage device is an M51996 waveform generator chip. The damage of this chip is usually caused by the sudden change of the working voltage. In addition, we often encounter damage to the CPU board during normal maintenance. Common fault alarms are E6 and E7, and the damaged devices are mainly concentrated on the program memory chips of the CPU board and some interface chips.
(2) For the E500 series inverters, the common faults we encounter are Fn faults, which are mainly caused by the damage of the fan. However, the inverter does not block the output when there is an alarm.