Jia Ling inverter maintenance
Model: JP6C-37KW
Fault: under pressure (LU) alarm
Fault analysis: the site survey power customers have properly discharged peripheral problems, the main reason is due to pressure alarm: low input voltage or phase, a road three road bridge rectifier thyristor is damaged or does not work properly, are likely to lead to the undervoltage fault. Secondly, the main circuit contactor is damaged, resulting in the DC bus voltage loss in the charge of the above, it is possible to cause under voltage. Also, is the voltage detection circuit failure and the problem of under pressure. It is good to check the rectifier bridge of this converter, because the converter is short connected to the charging resistance by using silicon controlled rectifier. So that fault inverter repair may be in SCR or its control circuit, the voltage doubler rectifier will be the main control board single pass on the power operation of the inverter using oscilloscope drive signal, the signal is 2.8KHZ, 15% duty cycle, the signal amplitude is 12 volts. The driving signal is normal, but silicon control is not conductive. It shows that the device is damaged, the replacement of thyristor power test on everything is normal. In addition, in converter maintenance, if it is found that the frequency can reach 1-2HZ, so, this phenomenon is also under pressure protection control, because the program CD10 undervoltage restart function will be changed to 0 CD10 internal data that can occur LU protection.
Good spirit inverter without display, lack of phase, over current, over voltage, under voltage, over heat, over load, ground, parameter errors, there is no output, module damage, fault code, etc.Can repair.
Jia Hong Wei repair service hotline: 0755-28916839, 13640994287 Shaw