From where you order this motor, 

seems you have 840D sl. for that is like this. power cable should be simple just U-V-W to SINAMINCS DRIVE , motor side should be round connector or terminal 

signal cable depend on the encoder your motor , SINAMINCS WILL NEED DrivCliQ (search by Google to get idea) if your motor encoder not driveCliQ, you need add coverter--called SM 

gtsolid

Hi,

 i have to commission this motor and i would to ask which signal and power cable i should use.

I don't have to use it in working conditions, only until max speed with few load.

I can connect him to a 6SL3121-1TE31-3AA3 or a 6SL3121-1TE24-5AA3 managed by a 840D

 Still not understand your question very well????

Do you think some different cable when drive running at full load 100% or 20% load? I never have such concern--no idea.

And can you tell more story about your project, such as how and where you got the motor, better post pictures of the cable you used and motor label (label will show you what kind of encoder)

gtsolid

My question was about the current the drive must provide: since it will not be running at 100% load, i think i can use a drive with 20% or less of deliverable current or something similar.

About the encoder i'll use DriveCliQ but i don't know if i can use a standard one. I think someone can bring absolute signal, some other no