Cause : Overcurrent comes when the motor connected to the drive is drawing more current than the permissible limit set within the drive parameters. The drive triggers the alarm to prevent potential motor damage or overheating.

The A020 alarm in siemens master drive indicates an overcurrent condition in the motor. This means the motor is drawing more current than the drive is rated for, or more than the current limit set within the drive parameters.

To correct the fault check the following thing:

1. Check the driven load for an overload condition.
2. Are the motor and the converter matched?
3. Have the dynamic performance requirements been exceeded.