We have a Mori Seiki MV50 and a Haas SL20 that were installed with an inline large transformer from our power service. We have had it installed this way for a while and everything has been working fine.
A couple days ago there was a bright flash of light and a boom at the transformer. It blew each of the fuses that are on each phase. We replaced the single transformer with two smaller transformers, one for each machine using the same leads from the power source. When power was turned on for the first time that transformer made a VERY LOUD noise and we quickly killed the switch to the power. A couple of the 150amp fuses had blown. We replaced the fuses and same thing. The fuses that were used were pulled from our building and are many years old.
Could this just be a case of 20 year old fuses that blew instantaneously and caused the transformers to only get 1 or 2 legs powered or could something else be going on. The noise is VERY LOUD like SCARY LOUD. Thanks for your help!