Cause : Alarm 4 comes when an active signal is present at binector U068 (1). Binectors are essentially terminal blocks or connectors on a Siemens Masterdrive that provide a way to connect external control signals or devices to the drive.

The A064 alarm in siemens master drive indicate an active signal present at binector U068 due to issue with the control circuit associated with that specific binector.

• Check cause of alarm.