Phase rotation

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I was working at a large facility where one of the projects was to switch over from ten years of generator power to local utility which was finally considered reliable enough to use. After everything was hooked up and ready for the transfer, we raised halfway a large rollup door that was powered by a 3-phase motor. After the transfer, everyone in the room could see the door direction based on which button we pushed. Easy. And a load already designed to go both ways.
Did you do this just to check rotation and then correct it if wrong? Depending on control arrangements your limits may not work if running wrong direction.




I have know idea.. maybe someone could sketch the triangle diagram for me. the wife might be able to help- it keeps saying upload failed..

Wrong file type or too big are common problems.
Using a host site to store your image and
 
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