I have 12 of these cars and some of them log several F/B IST faults throughout the day. It shows in the manual that this is caused by the brake or motor field exceeding 180% of their rated current. Visually, all brake and motor field connections look good and meter correctly. All parameters are set the same as the other cars that don't get this fault.
The fault doesn't shut the cars down but I'd like to get to the root of why it logs the fault. Any ideas that might lead to a solution?