Poor lube seems to show up very well here.
Watch this parameter and when you see it trending up take out your grease gun and give it a few shots. Check the trend again and you will see it drop to the normall level. If it comes up again in a few hours then maybe you have some damage on the way. Murray Some commercial systems use what is essentially the same method as Murray suggests. Oil lubricated bearings can really generate some strange data if their not lubricated adequately.