Customer: shenzhen baoan a large household electrical appliance manufacturing group co., LTD

Brand: in Cornwall electric

37 kw / 380 v power: energy-saving integrated ark

Fault phenomenon: customer equipment for injection molding machine oil pump energy saving reconstruction with frequency conversion cabinet, integrated injection molding machine energy saving integrated ark has more than 60 units with a total of 23 energy-saving integrated ark have different degrees of failure. Mostly showed no jump and run "OC" is now displayed in a no fault code, black screen, for example.

Failure analysis: measure the IGBT module is normal, disassemble the machine, found the power supply circuit has obvious fry black marks, the switching power supply has burn out. Measurement switch tube K1317 damage, Z1 diode IN4746 open circuit, protection resistor R1, the R8, 1 1/2 w r/open circuit, the LED has blown up, only UC3844 is normal.

The cause of the problem: due to the high frequency integrated ark use environment temperature long time didn‘t get effective maintenance. Is mainly a whole tank cooling fan can‘t work normally cause inverter long run high temperature burning power part.

Troubleshooting: more MOS tube K1317, R1, R81R / 1/2 w, diode IN4746, variable frequency energy saving cabinets to return to work.

Hong wei repair service hotline: 0755-28916839, 13640994287, Mr. Shaw