ebay board kits v 542 boards

[crossleymarko]

quick search and found this...http://www.e-dan.co.uk/electronics/wiringtrans.html
im confident in doing this but need steering in the right direction... are all the wire colours on the tororial universal...?

[Jonathan]

are all the wire colours on the tororial universal...?

Try this one:
http://www.arceurotrade.co.uk/projects/PSU/index.html
(I notice that diagram has fuses on the secondary side, however I did not include them since each stepper driver already has an internal fuse to protect against over-current. Also any 'nuisance' blowing of that fuse could damage the stepper drivers.)


The colours are not universal, however there is always a clear diagram on the transformer which labels which colour is which.

[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..

[Musht]

Never rely on colour codes being universal, not even from the same maker, just something I found out.......

Colours for the trafo linked to by Jonathan are in the PDF:

http://www.rapidonline.com/pdf/88-3781.pdf

Grey and Violet are joined, Blue is Neutral, Brown is live on primary.

Orange and Black joined are 0V

Yellow and Red joined are +V on secondary

Steppers are current driven rather than voltage, the drives take care of the current regulation just need a stiff enough power supply and will drive enough volts through to maintain current.

Cheers
Adam