A120 Overvoltage protection active alarm in ABB DCS800 drive indicates that the overvoltage protection circuit has been activated. This means that the DC bus voltage within the drive has exceeded a predefined limit, potentially endangering the drive's components.

• Overvoltage protection DCF806 is active and converter is blocked.
• Check OvrVoltProt (10.13) if necessary invert the signal (group 10).