Do you know the PMAC has an Amp enable output? You could just hook up the one you want. This way when you kill the axis in PEWIN it will disable the amp for you.
I would play with the auto tuning and closed loop. You really do not need to worry too much about open loop because the PMAC can disable the drive when in open loop.
I usually use Torque mode and do not hook up the Tach wires but that is just my personal preference.
Since you have the motors on the machine and are doing testing you do have the big red panic button hooked up
Just to warn you Delta Tau PMAC-Nc is not the easiest to set up either. Is it NC 2.36 I hope this is probably the most stable version they have. First get the axis tuned and moving using PEWin. Fight one battle at a time. You will also find out a lot of the Delta Tau experts/technicians do not know much about NC it is a very small percent of what they do.
Good luck and keep us informed