PI
Fault during parameter initialisation
Lenze · SM29_05 Service Bulletin
What does PI mean?
An error was detected during the parameter set transfer between two devices, or the parameter set does not match the controller (e.g., if data was transferred from a higher-power controller to a lower-power controller). This can lead to incorrect drive configuration.
Source: Lenze SM29_05 Service Bulletin
Open Manual (Page 328)