What do you mean that you’re not getting a voltage on Power and Ground? Your external 24V PSU is to be connected to 24V and GND underneath PWR and GND.
PWR and GND are the outputs from the internal 24V supply. They will be turned off in case of an error in the robot.
Can you measure 24V between any 24V and 0V? This will indicate if your supply is working correctly.