I was looking at the BP/Romi manual the other day, and in it they made a statement that if the DC voltage for the drives was too high, to use another tap, so there may be lower voltage taps available. I haven't been able to get mine to wake up yet after a HD failure, and sitting for five years, so I may dig out the transformer and have a look. I figured that the only down side to running the servos at 80 VDC, as opposed the the original 100 VDC would be a slower rapid feed rate, but that may or may not be true. What software are you using on your bed mill?