Err02 Over-current at acceleration When the frequency inverter accelerates, output current exceeds over-current. Check whether the motor is and its lines are short circuit, grounded or too long; Check whether the input voltage is relatively low; Delay the acceleration time; Conduct parameter identification or improve low frequency torque compensation or adjust V/F Curve; Check whether the load has mutation; Check whether it is to select speed tracking or start after the motor stops stably; Check whether the rated power of the motor or frequency inverter is large enough;