Originally Posted by
The Blight
I also believe Mariss has made some tests to see what happens when you cut power on the DC side. As far as I can remember, he recorded som pretty high voltage spikes, but nothing that killed the driver (Stepper motor). The fuse is also placed after the capacitors, so once the fuse blows, there is no power to the motors. The table/head might keep on moving if there is not enough resistance to stop it from moving, but on most machines this wont even be a problem.
I know the PMDX-122 has a e-stop feature built in. It disables all signals to the data bus once the e-stop button has been pressed. This is a feature you can disable if you want to.