2.2KW inverter reports fault EFAL
The fault description is that the output current is too large, the DC terminal voltage is too high, the internal connectors of the inverter are loose, and the no-load power-on test machine reports a fault, thinking that the Hall transformer is broken, and the Hall transformer is removed and powered on. Reported a fault, the drive optocoupler used for the six-way drive circuit of the inverter is PC923. It was impossible to check it for a while. I accidentally pressed the operation panel and found that the value displayed by the DC voltage was 860 volts. Based on experience, it is estimated that the power supply voltage detection circuit is faulty, and the frequency conversion The inverter detects that the DC bus voltage is too high, which threatens the safety of the inverter module, and reports the fault EFAL, disassembles the machine to check the voltage detection circuit, and finds that the resistance value of R32 is abnormal. 532 volts.
Inverter report fault E.SC drive circuit fault maintenance case
132kw inverter reported fault ESC drive circuit fault is the fault of fake module. Fortunately, the machine did not explode. Fault countermeasures, inverter three-phase output is short-circuited between phases or to ground, the power module is directly connected to the bridge arm, the module is damaged, and the brake is disconnected Electricity, discharge resistance discharge, test the main inverter circuit, U-phase lower bridge arm is straight, upper bridge arm is normal, V and W phases are normal, disassemble the machine and replace the U-phase module, (this newly bought module is fake, the last batch I bought five of them, and it’s not bad. I replaced a new module, the test drive circuit is normal, and the installation and test drive are normal.
30KW inverter reports fault (module protection)
There is no problem in testing the main circuit. Disassemble the machine to test the drive board. The dynamic and static voltage of the drive board is normal. What is going on? Because the inverter has been working in a humid environment for a long time, the test trigger lead found that there is a phase resistance that is abnormally large by about 5K. Insert the cable, use sandpaper to polish the three-phase trigger pin, the test resistance is a little more than 10K, reinstall the machine, the operation with load is normal, the switch does not report fault many times
30KW inverter reports fault (module protection)
There is no problem in testing the main circuit. Disassemble the machine to test the drive board. The dynamic and static voltage of the drive board is normal. What is going on? Because the inverter has been working in a humid environment for a long time, the test trigger lead found that there is a phase resistance that is abnormally large by about 5K. Insert the cable, use sandpaper to polish the three-phase trigger pin, the test resistance is a little more than 10K, reinstall the machine, the operation with load is normal, the switch does not report fault many times
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