Low voltage wiring of a milling machine

[leeradney]

We have a Chevalier FM-3VK milling machine, that was donated to our college's machine tool program. It was wired for 480. I have attached the pic of what the wiring diagram shows, as well as how it is currently wired.

The brown, blue and black wire on the bottom are labeled U,V,W, respectively. This is our supply. They are connected to U,V,W respectively. On the top side, U2 is connected to X, V2 is connected to Y and W2 is connected to Z.

If I am reading the diagram correctly, it looks as if, for Low Voltage, that X, Y and Z should be jumpered, and U(supply) U and U2 all on one terminal, V(supply) V and V2 connected on the next, followed by Y(supply), Y and Y2 on the next. What are you guys thoughts?

Thanks!
Lee

 

[RichB]

You got it---that is a typical wye or delta termination for low and high voltage operation--It equates to
High volt==1,2,3 to the line and 4&7, 5&8, 6&9 together and (these are the term numbers on a 9 lead motor)

for Low voltage it is 4,5,6 terminated together and the line goes to 1&7, 2&8 3&9