Thanks for the replies. There is 240V Single phase that is both sent to a contactor for the phase converter, and another line of 240V Single phase sent to another contactor for the transformer. When the turn the system "on"...the start button energizes the coils of both contactors. This starts the phase converter. Inside the 240/480V Delta Dry pack transformer, you have the the two wires that come from the transformer contactor that feed the Secondary connections, aka X1 & X2. There is 1 wire coming from the phase converter, it is attatched to the X3 connection. I will call the true secondary connections the 48oV connections ( H1, H2, H3) because they are feeding the tranformer backwards of what it was originally desgined. When I have no load, I have somewhat regular voltage, 472, 478, 490. When I start the vacuum pump, my voltage drops to 380 or so and stays there. With that running, I start the dust collector, my voltage drops to 280 +/-, but recovers to 380V +/- after 5 seconds or so. The CNC machine won't start at this point...not enough voltage. So they start the CNC first, and then the others. The problem is when you start the other equipment, the CNC machine throws a fault and has to be reset. They would prefer to shut the dust collector off multiple times per day. It just gets annoying restting the machine 20-30 times daily. Yes the equipment was designed for use in Europe. I'm still not even sure how it all works. the motors are internally wired for 415V Delta.
Like I stated in my first post....I DIDN'T install this system. I'm helping to find solutions to the problem. The contractor who installed it won't return there phone calls....go figure. Thanks everyone!