Bldc motor controller wiring, unidentified loose negative wire for hall sensor circuit?

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Cyrus Mingley

Joined Apr 18, 2020
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My bldc motor with a built in speed controller has a diagram online 323B1FE8-1BDB-46D2-B7F3-9863DE59C4F4.gif
And I’m planning on connecting it to a potentiometer. The controller wire has 6 separate wires, red, white, blue, brown, black, and green. image.jpgIf the wiring diagram is right, then r, w, and b wires are sorted out. Apparently connecting 2 of the remaining is sort of a shut off, that leaves me with one wire. The green wire is connected to the negative of the hall circuit, image.jpgimage.jpg
And I checked with a meter, there’s barely any resistance so it’s a direct connection I assume. Is this supposed to be connected to something important? I assume it’s not supposed to be just floating around. Is this one used to shut off the motor?
 
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