Personally I would look at seeing if you can bypass the whole of the 600?
Why transform up to 600 when in all probability the machine converts it all back down to
240v 3 phase anyway, unless there are 460 only item.
Most drives are at 240v, the exception could be the spindle drive which if DC may have a 460/240v star secondary with the star used as common for the SCR controller.
But it may be worth the check to see what you can actually run on 240.
In some case you may have to confirm fuse and wire rating.