Thread: 3 phase power question

Hi All,

I have a Shizuoka ANS mill that requires 3 phase 220V power. The input terminals are labeled "R" "S" "T" and "G" (ground). Question is which is "L1" "L2" "L3" ? Also wondering if I can safely connect 220V or 115V single phase to the input terminals in order to check out some of the machine functions that operate 115V motors. If yes
what terminals would I use ?
From what I can tell the spindle motor is the only
thing that requires 3 phase. Right now I do not
have 3 phase power available. I am working on
putting together a rotary phase converter.
I do not have schematics for the machine.
Any help would be appreciated.
Thanks
Al

L1-2-3 is irrelevant, as long as the rotation of the 3 phase motor is correct.

As to which phase has power tapped off for your 1 phase loads, there is no convention or standard that applies, it could be anything. You either need the schematic or you can possible try tracing the wires. If you are bold, you could just experiment by applying power to one and see if it works. If not, try a different one. Be aware however that it may be more than one phase or there may be a control power transformer that is powered by 2 phases.

Actually, being a Japanese design it may be that they would have used a transformer because 220 / 2^3 = 127V, a little too much for a 115V rated motor. So there probably is a 220 - 110V transformer on there. If so, just apply your 115V test power to the secondary side of the transformer, but make sure you pull the fuses to keep it from back feeding.

Jraef,
Thanks for the info. There are 3 or more transformers on the machine. Some feed DC motors
in the tool changer.
I will try to trace the circuits. I was not aware
that anything used 2 phases. I just wanted to check out what I could before going to the expense of a rotary phase converter. I will be cautious.
Thanks
Al

"I was not aware that anything used 2 phases."

One can derive a single-phase source by tapping into any two phases.