Cheers Dean! That's a big help.

I don't know if this should be posted in another section really, but its all related.

When switching off the 70v supply should it be switch before or after the transformer or does this not matter?

Do many people have an input to the 24v system from the pc incase the computer crashes / turns off for some reason acting as an e-stop or would the code just stop running the anyway not harming the machine?

So that the drain resistor isn't constantly connected during the 70v supply is it connected via a relay so that when power is removed the resistor is engaged to drain the motor supply system?