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[John S]

Also any 'nuisance' blowing of that fuse could damage the stepper drivers.

No the fuse is on the supply input. Stepper drives are damaged when the motor supply leads are interfered with.

[Jonathan]

No the fuse is on the supply input. Stepper drives are damaged when the motor supply leads are interfered with.

It's on both sides in the diagram on Arc Euro. Stepper drivers can be damaged if the power wires are suddenly unplugged for similar reasons to doing the same to the motor wires. It's less likely but still possible since interrupting the current causes a high dI/dt which will cause a voltage spike.

[John S]

It's on both sides in the diagram on Arc Euro. Stepper drivers can be damaged if the power wires are suddenly unplugged for similar reasons to doing the same to the motor wires. It's less likely but still possible since interrupting the current causes a high dI/dt which will cause a voltage spike.

So what happens when the onboard fuse goes or does that behave differently ?

[crossleymarko]

overkill is my theory for future upgrades.. same with the transformer. what would you recomend for overkill..
also i read it as your stepper is rated at x volts. how is the homebrew psu regulated.. to said volts..