Repair of 22kW HC1 drive module malfunction

A 22kW HC1 drive, the fuse of the inverter module power supply series connection is broken, and no other abnormalities are found in the main circuit measurement. After installation, first send the inverter power supply to 24V and jump EOCn, which means overcurrent during acceleration and short circuit on the motor side. Obviously, there is still a malfunction in the module or driver part. It seems that it’s not just about replacing insurance.

Dismantle and recheck the driver circuit board. It was found that there was no positive excitation pulse output in one of the driver circuits. The power amplifier tube (lower tube) of the driver circuit was found to have broken down, and the voltage terminal of the module trigger terminal was continuously embedded on the negative pressure. After replacing the amplifier tube, the pulse circuit is normal.
Install the machine, connect to 24V power supply, and power on to trip EfbS, which means the fuse is blown. Remove the 24V power supply and replace the original fuse terminals with light bulbs in series, which will emit strong light upon power transmission. But after removing the trigger terminal during power outage, the individual measurement module was normal; Install the insurance and connect the inverter circuit to a 24V power supply. Start the frequency converter, and when the frequency rises to around 5Hz, the ECOn will still trip. I’m not sure if it’s still a problem with the module or the driver circuit.
Recheck the positive and negative voltage and current of the drive output, both are normal. Possible module malfunction. Simply remove all three modules and place them on the workbench for power testing along with the driver board. After powering on, it was detected that the negative pressure on one arm was low, about 2V. Disconnect the trigger terminal, the negative pressure returns to normal value, insert the module trigger terminal, and the negative pressure decreases again. Confirmed that the module was indeed damaged, replaced with a new module, and the fault was repaired.