text: <s>[INST] 200hp 1336 Plus - Why am I getting an F12 Overcurrent fault at power up? I am getting an F12 overcurrent fault as soon as I power my drive up. The motor has megged good and I have even taken the motor leads off of the drive. Ohm value between each VFD output phase is around 2.0 meg.Things I have checked:- checked all IGBT's according to manual and they checked good.- checked input voltage scrs and good- checked pre-charge board fuses and good- replaced gate driver board- replaced main control board- replaced HIM- Loaded a different program into drive and still get same fault. We have just replaced this drive about a month before and it ran fine after we replaced it. I sat for about a month and when we tried to start it up the f12 fault is displayed. [/INST] You have been very thorough in your diagnostics, but there is one thing I dont see in that list. An overcurrent in a drive that size would tell me that one or both of the LEM modules on the drive have malfunctioned, or have been wiring incorrectly. They are on the output of the drive, and sense the output current. Can you check them for a shorted or open condition, and make sure that they are wired in correctly. They would be the only thing that would tell the drive it is outputting too much current. \\n </s>