Please check the electrical drawing came with the Robot Controller. Also inside the Junction Box (located on robot base), all the wires with connectors are labelled which can be easily distinguished which wire is for what.
Anyway, there should be six resolver cables labelled according to the axis numbers if the robot is six axes robot. One cable should be the the 24 VDC X17 or X19 jst a guess. One more cable for the Mastering tool.