ABB ACS580MV Commissioning Manual page 130

130 Option
FF7E Follower Fault shown with aux code on Master when Follower has fault. (Aux code is
the node of follower).
Make sure following items have been checked before M/F test.
1. All drives have been tested completely as vector control mode.
2. Check M/F link, and make sure the fiber optical connected properly.
3. Master/Follower options ticked in Converter configuration.
Vector control is the recommended control method for Master/Follower applications.