Connection crossfire pro wuth plasma wiring

Good day. I have a question. Îm connecting my crossfire pro to my plasma hypertherma 45. I have a purple and orange wire and a red and black wire from my table. Wich one to connect with the black wire?

https://www.langmuirsystems.com/crossfire/assembly#plasmawiring-section

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This guy does a nice job explaining the situation:

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