CNC retrofit using Bridgeport Power Supply?

I'm upgrading a BOSS controller to EMC using Gecko 210's
to drive the steppers. I was wondering about using the
existing DC power supplies to drive them.

They put out about 84VDC (60VAC) on the lowest voltage tap.
This is apparently too high for the Geckos which I
understand to be limited to 80V (will have to ask Gecko).

One option would be to wire the 3-phase transformer to power
the 440V tap with 220V which gives 40VAC on the output
and 56VDC rectified.

Do you think that 56V is sufficient to power the steppers?

Thanks in advance for any advice.