Power supply voltage.

I am currently in the process of converting an
engine lathe to CNC using Mach1 & G201 drives. I am
using Nyden Nema 34 stepper motors rated @ 2 amps, 7.6
volts. These are 6 wire motors, half-winding connected.
I am using a machine tool control transformer.(ie:
220 to 110 or 440 to 110). If I connect 110v AC to
the 440 taps I get 42 volts DC. I have tested this using
Mach1, & both motors run very smooth @ 1000 steps per rev.
without any lost steps.
If I connect 110 v AC to the 220 taps, I get 83v DC.
I would like to try this voltage but, the G201's are rated
for 80 volts max. Will this extra 3 volts damage the G201
drives?

Thanks:
Gerry