If you meant cable drag chain by dynamic energy chain,
you need to first create an assembly for drag chain which is flexible (advance mates like distance and angle do not work in higher assemblies, so you have to do it using standard mates)
Then you can insert chain into desired assembly, solve it as flexible and mate chain's ends and then it'll drag with carriage.
Anyways, I prefer drag chain as part and add it's significant positions as configurations, so that I can select required config to show correct position of drag chain.
The rope animation is brilliant! I couldn't ever believe Solidworks could do that.