It is solved. We didn't find the exact problem but will mention what we did.
We replaced three contractors (Main, Delta and Star) and an OLR (Old OLR was not resetting and it looks like the links are completely melted during short circuit)
We checked the old timer it was working perfectly but...
The tiny time difference between the wye out and delta in is actually controlled by timer. I do not how how to configure it.I have attached a photo of the timer in the first port.
What you mean by "voltage in wrong phase" ? If what you said is right, why it is not happening in the initial...
Hi,
PROBLEM
When the 10 HP 420V 50Hz motor of my lathe machine gets shifted from Star to Delta all three contactors (Main, Star and Delta) gets welded and it trips my workshop supply altogether.
OUR INITIAL ANALYSIS
We thought we had a faulty contactor since the machine is too old, So the...
