Mazak tripping disconnect

Good Morning fellow Zoners,
I have recently purchased a used mazak QT-20 -univ. from a company in Wisconsin. I have 30 or so mazaks and never seen this problem with any others previously. OK, I hooked up the power this weekend. 440 volts to the transformer and 230 volts to the disconnect. When turning on the disconnect, it immediately trips like a dead short! Anyone have an idea where to start? Any help is appreciated.

Ok guys,
I found a bad cabinet switch. Disconnected the switch and it runs like a champ! Glad it was that easy!!!