Cause : Serial bus timeout comes when there is no serial communication with the frequency converter. This warning will only be enabled if parameter 556 Bus time interval function has been set to a value different from OFF.

1. If parameter 556 Bus time interval function has been set to Stop and trip [5], the frequency converter will first give off an alarm, then ramp down and finally trip while giving off an alarm.
2. It is possible to increase parameter 555 Bus time interval. Warnings and alarms, cont