Hi, I need an instruction manual for a RD 50 R-Drive for the compressor. Do I need to calibrate servo? Thanks.

Nothing shows up on a Bing search for "RD 50 R-Drive". Care to tell us more?

Perhaps it is a DC servomotor / brushless / 48V / controller - RDrive - Rozum Robotics - Videos (http://www.directindustry.com/prod/rozum-robotics/product-194921-1971970.html)
All right, is that him?
The instruction manual can be found here:
https://rozum.com/servomotors/

You can either view it online or download it as a PDF file.
https://rozum.com/support/docs/servo-api/group__hw__manual.html
I hope I've been helpful.