You need to use SuperTrends to log to the hard drive. Look in Pac Display user guide for super trends.
If you’re using supertrends, make sure you have configured for combined real and historical. Then, if all that’s good, then you simply need to click the little button at bottom of chart that looks like a file folder and it will open a list of files that have been logged and you open them one at a time and you can then get the historical.
Pac Display saves the data as per your config to files abd once you close Display, you have to open the logged files that have been closed. Check out the Setup tab of the SuperTrend setup.