ur 2 fingers are covering a VERY important clue - the wiring diagram for this 3ph transformer. Your pictures are wonderful! how about one of that wiring diagram under your fingers?

remind me: u thought your machine is wired for 600v input...... this xfmr seems to indicate it is actually wired for 200v 3ph input?? those blue wires may be #12 so good for the 20 amps Al says the spinde is rated, and since the spindle is the major load for the machine, ya, those blue wires may be big enough to supply the whole machine.....

3500va/200v/1.73= 10amps..... does the machine nametag list current rating at all? might it be 10 amps at 200v?

and ya, the T2 single coil xfmr with red wires is the control xfmr so not important to the issue here as it would be fed off a secondary of the 3phase xfmr. It looks like - under ur fingers - the 3ph xfmr has spindle/servo 3ph secondary and a few single phase secondaries to feed things like coolant motors, control xfmr, etc..... when we design customer xfmrs for machines like this we often have multiple secondaries like this.