MITSUBISHI inverter repair
Failure phenomenon: the boot operation shows OC alarm
Failure analysis: MITSUBISHI inverter fault phenomenon caused by the main reason for the following may be OC:
(1) driving circuit aging due to the use of longer life, will inevitably lead to the aging of the components, so as to cause the drive waveform distortion, the output voltage is not stable, so often a run on the OC alarm.
(2) the IPM module can also cause damage to the OC alarm power module use D700 series of MITSUBISHI inverter not only contains overcurrent, undervoltage detection circuit, but also include amplifying and driving circuit, so whether it is the damage detection circuit, driving circuit and high power damage, damage to the transistor are likely to cause OC alarm.
(3) most of the failure causes are caused by the failure of the thick film of the switching power supply.
(4) ERR fault is an under voltage fault, usually because of the voltage detection circuit resistance or connection problems and lead to the generation of the fault, rather than the actual input voltage is really the emergence of under voltage. Most of the F700 series of OC fault is caused by damage to the drive circuit, the drive circuit which has a ceramic thick film circuit package, which brings some difficulties to the maintenance, the thick film circuit is mainly designed a driver circuit based on.
(5) we will encounter some LV fault, there is less pressure fault mostly because of the bus detection circuit malfunction, MITSUBISHI inverter also designed a circuit for voltage and current detection. A common fault of power switch pulse transformer is damaged F700 series inverter, due to the short circuit output switching power supply load, abrupt or bus voltage caused pulse transformer‘s primary and secondary winding damage.
Repair: disassemble found part of the normal voltage power supply board, after inspection found the driving circuit has an output is not normal, remove the check after the discovery of optocoupler has been bad, the IGBT module is normal, to eliminate the fault in the replacement of these accessories.
Hong Jia Wei maintenance maintenance of MITSUBISHI FR-A700 series, FR-F700 series, FR-E700 series, FR-D700 series, MITSUBISHI inverter maintenance and common fault of Hong Jia Wei MITSUBISHI: no display, phase, overcurrent, overvoltage, undervoltage, overheating, overload, grounding, parameter errors, there is no output display module, damage etc.;
Jia Hong Wei repair service hotline: 0755-2891683913640994287 Shaw