Cause : EFB CON FILE comes when error in reading the configuration file for the embedded fieldbus. The F0029 alarm signifies that the drive has detected an issue with the EFB configuration file.

The F0029 alarm code on your ABB ACS550 drive indicates an EFB configuration file fault. EFB stands for External Field Bus, which is a communication interface used by some ABB drives for advanced functionalities like connecting to external control systems or field devices.