Cause : Absolute encoder multi- turn counter error comes when the encoder detects an error of the multi- turn counter. The multi-turn counter tracks the position within one full rotation of the encoder, and this alarm suggests that there may be a problem with how the encoder is counting or interpreting this data.

"alarm 45" in panasonic servo drive indicate "Absolute encoder multi-turn counter" error. This means an issue with the multi-turn counter of the absolute encoder.