text: <s>[INST] PF 753 voltage dependent errors Having issues and wanted to start simple... Copycat drive info and default. Then things got weird, at first I saw an illegal message with a long numeric code briefly before the hmi started to re initialize . On occasion the hmi would connect to the drive but every time pressed enter for my language selection I could go no further and the hmi started over. Eventually this turned into a stuck initilization screen if I left it powered long enough. Sometimes there would be just blank fields with no characters/ logo. A little while into this I noticed that, guaranteed, it would connect to the drive right before the bus dies when I shut the power off. Long story short, found that about 150 vdc on the bus and I get normal operation as far as the hmi goes and it doesn't keep reinitializing. What makes this odd to me is that when I changed out boards from another drive , the main board and control pod, I got the same results no matter what combo was installed. And the errors/ how it acts are dependent on what the bus voltage is. Anything over 200ish and it starts doing stuff. Couldn't find any other pple describe something similar, so any ideas? [/INST] First off... I'm not a drives guy... But the circuit boards get powered from the power structure so if you swapped boards and still have issues, then the problem could be the power structure (which is power the boards)? Maybe it is generating a lot of interference (do to a power component issue... e.g. smoothing capacitor, voltage regulator, etc.) \\n </s>