I have managed to solve the issue you describe by wiiring the X211C according to schematic received from robot previous working plant (Daimler). Documentation came with robot luckily. In my case X211C is 47 pin harting connector.
I had another issue because robot was safe edition,I had to add additional signal cable from KRC2 to robot (motor cable, Resolver cable, additional signal cable, 3 in total). In the end safe edition made such a headache that RDW card was replaced with standard one and system reinstalled (not so easy because MADA had to be changed) , but this was done by external company.
Try to be 200% sure your wiiring on X211C is correct otherwise you will not be able to move the robot. You can contact KUKA tech support, they have helped me a lot and they are very responsive and offer great support over the e-mails. You just start an issue with them over e-mails.