Zenon Trending Graph

Zenon Trending Graph

Hi, does anyone know why this will happen in a trending for total power consumption. Historian was set to 1 min for it and it was normal before and being abnormal at certain period of time as shown in pictures. This is only one variable and I'm no sure why there were many lines up and down. Does anyone experience this before?
Besides, what is that meant for a warning message like this---" Archive 1 cannot be read completely, please set a shorter time period"? Is the recording time too short or the trending display time period too short? How to avoid this kind of warning mesj? Thanks


This is a migrated post! Originally posted on 13.05.2019 by user shaun. Please be aware that information can be outdated.