Originally Posted by
A1CNC
I have been having trouble with one of my vmc's since I brought it into my shop. It is a supermax v56t with fanuc 18m control. It will sometimes run fine other times it will give a 401 not ready o/v alarm on a twin axis servo card. This morning it ran fine for ~ 2hours and all of a sudden the alarm starts popping up.
I was looking at the capacitors in the phase converter to see if/ how to try to balance the voltage across the 3 phase. My thinking is maybe the voltage imbalance is the problem. Voltage incoming is 240-245 v
Out is 115, 118, 208 to ground.
So I was trying to figure out the capacitor wiring and think it might have been wired wrong as the large capacitors are wired from t3-t2, t1-t2, and the third one is also wired t1-t2.
There are also smaller capaitors with resistors on them and 2 of them have jumper wires between. those also are wired t1-t2 on both. One of those has the jumpers to a 2nd capacitor.
I tried finding a manual for the american rotary but it is crappy in that it does not show the wiring for the caps.
My phase converter is the vertical buss type.
Any help greatly appreciated. I am trying to get a job done