Mesa 7i77 + 5I25T Configuration Issues

Hi,
I am attempting to retrofit a Peddinghaus BDL760 CNC drill line using a 7I77 and 5I25T to replace the Fagor 8025MS controller. I have run into issues with getting feedback from the servos. Any help would be greatly appreciated.

Issues:

• I am able to move the X,Y, and Z, however the X and Z servo encoders are not providing any feedback (Velocity and Position),
• The Y servo encoder always has the velocity and position values start at zero, and they both gradually increase at a steady rate even though the axis is not moving.
• Since there is no positional feedback coming from the servo encoders, after the axis is moved a small amount I am getting joint 0 following error. Which makes sense.

Checks/Troubleshooting Steps Taken:

• On the 7i77, the jumpers for each encoder are set at differential.
• On the 7i77, the W5 jumper is set to left hand position to receive 5V power from the 5i25T.
• On the 5i25T, the W1 jumper is set to UP to provide the 7i77 with 5V
• Updated to the latest firmware found on the mesa website (5i25t_7i772sd.bin)

Servo Documentation:
Name: Pacific Science SC900 Single Axis Resolver Based Brushless Servo Drives
Manual is attached.

Wiring Setup:
Attached

Any Help Would Be Appreciated 

Looks like there may be no common ground between the drive and the encoder inputs.

I think the encoder common is J4 pin 18, these should go the the 7I77s encoder ground pins.