Nope, the communist devs did not include the num pad keys in the controls, for reasons that can only be described as brain dead. I am very frustrated as I use the num pad keys in my basic key bind set up in every other MMO I play.
Then, you can use the command /bind_load_file NumpadBinds.txt to load up the bind file and have your numpad keys invoke the powers slotted in tray #2. I think it's tray number two, but I could be wrong. I hope it'll work for you, because it does for me.