Troubleshooting summary for the inverter switching power supply
Inverter power-on operation panel flashing fault
The fault belongs to the switching power supply working abnormally, starting vibration and then switching off. The damage may be:
1, the load is too heavy, Danfoss VLT5000, for example, may be damaged fans, IGBT drive line short circuit, resulting in too heavy a load on the switching power supply, the switching power supply current is too high, and it is automatically shut down.
2, the switching power supply line is not working properly. Danfoss VLT5000 inverter switching power supply line has a voltage regulator, DC voltage detection, etc., if any aspect of the problem, may lead to this phenomenon.
Inverter power-on only ON and other bright, no panel display
The phenomenon most people would think that the control card is damaged, but the maintenance centre * recently summed up the experience. As Danfoss inverter VLT5000 switching power line has two +5VDC, one of which is a switching power feedback, the other +5VDC is to the control card power supply, if the power supply is damaged, or there is no voltage, will lead to this phenomenon. So in the maintenance of the key to more measurements, the entire switching power supply to have an understanding of the only way not to be helpless. As long as the switching power supply line all draw drawings, then again difficult power supply or repair.
Frequency converter power on no display
Some customers send repair inverter send point without any abnormal sound, no odour, no flicker, and no ON light condition. Repair centre has repaired a number of such inverters, these inverters is the switching power supply line is damaged, for this type of failure, it is necessary to have the patience and ability to repair. From the vibration line, voltage regulator circuit, all kinds of detection lines in a step-by-step test. You can first measure the components one by one, and then send the weak power test, * and then you can test the strong power before you can repair.
Inverter display 8888 fault
The cause of this fault, basically will first replace the control card to try. In fact, sometimes it may be the control card is damaged, but most cases are caused by damage to the switching power supply. Delta inverter, for example, after displaying 8888, you can go to measure the feedback voltage of the switching power supply, if it is +5VDC is normal, in many cases it is +5VDC is not working properly.
Frequency converter power on abnormal sound, but the operating panel does not display
Common is a squeaky sound, but no display. We can go to test the switching power supply switching frequency, starting voltage, and whether the feedback loop is normal. But Delta has a common problem, that is, the fault is basically switching power supply filter capacitor and rectifier diode has a relationship, either the filter capacitor leakage, or diode short-circuit. Sometimes capacitor leakage can lead to corrosion of the circuit board, special attention should be paid in the maintenance, clean circuit board and then replace the filter capacitor.
