A: The GD20 frequency converter reports an ItE fault. The customer measured the diode voltage drop of the main circuit and the inverter circuit using a multimeter, and found that it was normal. The IGBT power module was intact and there was no breakdown or short circuit problem. After powering the frequency converter alone, the device immediately triggered the ItE current detection fault alarm. After replacing the brand-new control board, the ItE fault was eliminated, and the three-phase output of the frequency converter was restored and operating normally. When encountering an ItE fault, the following steps can be followed for investigation and repair:

1. Check the connection status of the wiring between the control board and the driver board, and re-plug to confirm the reliability of the contact

2. Confirm that the phase sequence of the Hall cables U/V/W is completely matched with the phase sequence on the driver side; check that the Hall pins are not offset and are securely plugged; if there are no abnormalities, directly replace the Hall sensor for testing

3. Disconnect the power line of the motor on the frequency converter side, and power on the frequency converter alone. If no more faults are reported, it is determined to be a problem on the motor/lower load side

4. Replace the intact driver board for verification

5. Replace the intact control board for verification