You can download document from here :
http://www.automation.siemens.com/doconweb/content.asp?item=2602&cd=sinumerik_sinamics_04_2007_e&scope=all
840D SL,It have no use in china now,so no people can help you.
I think 840D SL drive parameter is same with 802D SL,they use same drive,SINAMICS S120.
Good luck,Heroin!