Panasonic maintenance, maintenance method of Panasonic inverter.
(1) Panasonic inverter has no display power supply.
In the maintenance of DV707 series inverter, the fault that the author often encounters is that there is no display power, and the external power supply, display and other factors are excluded. Most often it is damage to the switching power supply. During the maintenance process, we can notice that the pulse transformer of the DV707 series inverter is a kind of equipment that is easily damaged. Due to the influence of high-frequency magnetic permeability materials, load capacity, short-circuit and over-current protection circuit design of switching power supply, etc., the primary winding side of the pulse transformer is easy to burn out. Because the frame design of the pulse transformer is different from the general lifting/step-down transformer, it is not easy to disassemble, the magnetic permeability material is often opened after disassembly, and there is a gap in the magnetic field when the connection is closed, and the pulse transformer cannot work normally. In general, the pulse transformer is replaced.
In addition, the design of the DV707 series inverter switching power supply is different from other inverters. The MA2810 model integrated block is used to integrate switching power tubes, clamp regulators and other components, which reduces the peripheral circuits of the switching power supply, but the damage probability of MA2810 is high in maintenance.
(2) The inverter module of Panasonic inverter is damaged.
In the VF-7F series inverter, damage to the inverter module is sometimes encountered. A common phenomenon is that the inverter suddenly loses power during normal operation, resulting in the inability to start the motor after the inverter is restarted. After checking the damage of the inverter module, the main reason is that the inverter is still under the control of the running command after the power failure. At this time, due to the load consumption brought by the motor and the consumption of the inverter itself, the intermediate DC voltage drops sharply, and it is easy to change the bowPWM modulates the wave signal, causing damage to the power module. -In this case, the drive circuit is not easily damaged. Replace the inverter module and the inverter can resume normal operation. In this case, it is best to take measures on the control circuit and block the inverter output immediately after a power failure.
(3) The drive circuit of the Panasonic inverter is damaged.
In the maintenance of DV707 series inverter, the inverter module is often damaged, and the drive circuit is also E damaged. The absence of negative voltage in the drive circuit is a common phenomenon in which the drive circuit is damaged. The DV707 series inverter selects Fujifilm's PIM module for power equipment, which belongs to the IGBT type. As we all know, IGBT high-power tubes are voltage-on, which will cause IGBT to be unable to shut down effectively in the absence of negative voltage, resulting in misleading. Negative pressure is usually generated by regulated diodes, which is the most common site of damage. After replacement, the drive waveform should return to normal.
Fourth, Panasonic inverter LV failure.
LV failure is also one of the phenomena that is often encountered in maintenance. Especially the DV700 series inverters. After excluding the factors of external power supply problems, the most problematic should be to detect circuit faults, sample through the buck resistor, and send the optocoupler signal to the main control panel through optodephone isolation for processing. Buck resistors, isolated optocouplers may be damaged. After replacement, the machine should return to normal.
Panasonic repair, some maintenance methods of Panasonic inverter.
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