Error: short-to-ground
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I'm going crazy . Now of course everything becomes clear. I've already wired some motors at work but all manufacturers of stepper drivers have called the phases A and B. And because everything worked fine if I used both Z-contacts I never thought I had wired something wrong. Unfortunately, I can't test it until tomorrow because I'm building my printer at work. I'll let you know if everything worked fine. Until then many thanks for your efforts.
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The motors are moving and I'm so happy. Thank you for your help.
Perhaps in your documentation you could give a short explanation of the different manufacturers' labels, so that nobody else makes this mistake.
Bye.