Cause : EFB CON FILE comes when configuration file reading error. EFB stands for "Drive Application File" and refers to a file containing specific application parameters and settings for the drive's operation.

The F0029 code in your ABB ACS310 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.