The alarm 2021 on an ABB drive indicates an external fault and the external fault may need to be manually cleared using an external reset device.
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Press the "Reset" button on the drive's keypad. This will clear the alarm from the drive's memory and reset the drive to its previous operating state.
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If the alarm persists, you may need to identify and address the external fault that triggered the alarm. Check for issues such as motor overload, phase loss, or other issues in the motor or power supply.
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If the external fault has been addressed and the alarm still persists, you may need to consult the user manual or contact an ABB service representative for further assistance.
Note that in some cases, the external fault may need to be manually cleared using an external reset device.
