text: <s>[INST] Powerflex 755 motion axis fault Hello, I was hoping someone would be able to shed some light on an issue I ran into. I have a machine that is using a powerflex 755 as a servo motion axis. I ran into an issue where the drive had a fault 91(Pri VelFdbk Loss) which showed up in the PLC motion axis fault list as Feedback Data Loss Factory Limit . Whatever I did to try and clear this fault did not work. I tried replacing the encoder; I tried swapping encoder option cards, nothing worked. Finally after reading some knowledge base articles I came across a troubleshooting tip that mentioned power cycling the drive with ethernet cable disconnected then once rebooted reconnect it. Doing this caused the drive to go through some sort of re-initialization or some sort then the fault was gone. The thing I am wondering is can someone explain to me what exactly the drive is doing during this re-initialization after reconnecting the ethernet cable. I would like to better understand what is happening. Thank you. [/INST] Can you please provide the tech note number you are referring to? \\n </s>