Ok - So I'm going to connect all ALM+ in Parallel to the Fault pin, and then all ALM- in Parallel to the GND pin next to Fault.

By my reading of the manual - the ENA + and - , is in the Enabled state by default as long as it is disconnected. ( Ie - I'm going to leave these pins not connected to anything = drive enabled )

For the Fault signal, my understanding is that Fault signal functions the same as the E-stop signal once it is active - as you mentioned. In that PDMX will disable all of it's own outputs, ( servo drivers, Relays, as well as signal to PC on PIN10 that the e-stop has been tripped). That then halts the operation on the PC and places my UCCNC software in reset active mode - which turns off the watchdog timer, which in turn backs up the PDMX in getting it to turn off outputs in the case the PDMX internal E-stop circuit fails to turn outputs off. ( In this state the AM882 drive signals should be unpowered - including the ALM+ and _ , and the PDMX has returned to Off due to watchdog timer not active? )

I then click on the software reset, which should effectively turn on the PDMX when watchdog becomes active again. Then I Home the axis to get rid of missed steps, turn on the spindle / coolant, and Run from a few lines before the fault freeze. - That's my plan. I was wanting to run the spindle power through the PDMX larger relay so that the spindle turns off, but I don't know of that's the right thing to do as it will cycle power to the inverter when the spindle is a full speed. - Maybe there is a better way like an e-stop that I can wire into the VFD. I did want to use the smaller PDMX relay to drive my spindle water pump, and also the dust extractor so that if a fault is detected, effectively everything turns off.

On a side note - is there any benefit to setting up the AM882 to run using a common PC+5V vs, the other way with the common PC-gnd? On the PDMX manual it has a pic with typical connection for leadshine, showing the Common +5V PC as the setup.Which one should I choose?