This will work fine. That is how I run my shop. I have a 240 3 ph
distribution panel after the rotary phase converter, and a 480
distribution panel after the 3 ph. transformer. Then whatever new
machine that needs to be hooked up can be wired to the proper voltage.
That saves a lot of fussing with rewiring motors, control transformers,
changing heaters, etc.

Another benifit is that hard to start motors, in my case the 15HP IR
air compressor, starts a bit better on the higher voltage (480) as
compared to the 240.

Your milage may vary....

Bob