How do you run a 415v 3 phase motor with a 230v 3 phase supply?

IF YOUR MOTOR HAS 6 LEADS (IN THE TERMINAL BOX) OR 9 OR 12 LEADS THERE IS NO PROBLEM. IF IT IS A BRAND NEW MOTOR THE WINDING CONNECTION DIAGRAM IS NORMALLY INCLUDED IN THE NAMEPLATE OR INSIDE THE TERMNAL BOX - T1,T2,T3,T4,T5,T6 OR U,V,W,X,Y,Z MARKINGS. DUAL VOLTAGE APPLICATION IS A NORMAL OPTION FOR MOTORS. IN THIS CASE CONNECT IT IN WYE (SOME CALLED IT STAR) CONNECTION BY CONNECTING OR COMBINING T4,T5,T6 AS COMMON OR NEUTRAL THEN APPLY 230V 3 PHASE POWER SUPPLY AND CHECK DESIRED ROTATION OR ELSE JUST INTERCHANGE ANY TWO SUPPLY LINE TO CORRECT ROTATION.

 

Answer

Judging from the values of voltage that you quote, you appear to be referring to the UK supply system. In that case, a three-phase supply has a line voltage of 415 V and a phase voltage of 240 V. So you can simply connect the machine's controller directly to the three line conductors. (These days, the nominal voltage for UK supply is now 400/230 V although, in practise, it is still 415/240 V).