Cause : Standard bus timeout comes when there is no communication to the frequency converter.The warning will only be active when parameter 514 has been set to another value than OFF.

• If parameter 514 has been set to stop and trip, it will first give a warning and then ramp down until it trips, while giving an alarm.
• Check connections on the serial communication cable.
• Check the operation of the communication equipment. Verify a proper installation based on EMC requirements