East yuan inverter maintenance
Frequency converter model: East yuan 7200-22KW
Fault phenomenon: output three-phase imbalance
Fault analysis: to the customer site to see the start of the motor has obvious jitter, a long time on the alarm. Disconnect motor measurement output with three-phase unbalance. Preliminary elimination of motor faults. The inverter module is no problem. The transducer back repair, disassemble machines found driving circuit has short circuit, the main control board found no problem, the driving part burned in several places, and found that measuring optocoupler V driving voltage abnormal, replacement power test, the test procedure according to the main circuit to control the no-load, load check respectively. The power before the test to ensure the safety device, to prevent further damage to important devices, large capacity capacitor temporarily don‘t stop, instead of two small capacitors, in order to protect the IGBT power supply circuit of capacitor to IGBT series is the best incandescent bulb (that is, a dummy load power), if the display is normal. You can then start the inverter measuring 6 trigger pulse, the drive signal is normal, can be removed between the capacitor and the IGBT light bulb, for no-load operation with large capacitor, and then connected with the normal load operation, debugging machine after the return to normal.
East yuan inverter 7200 series no show, lack of phase, over current, over voltage, under voltage, overheating, overload, grounding, parameter errors, there is no output, module damage, fault code, etc..
Jia Hong Wei repair service hotline: 0755-28916839, 13640994287 Shaw