I have ordered two 2HSS86 stepper motor drives and motors from SZGH. The input voltage states 30 to 80V ac, i contacted Mike their technical man who recommended 60V ac and a 1000VA transformer with the outputs connected in parallel. I have a couple of 500VA transformers which have two 35v outputs on each which will give me 70v.
How does this input voltages impact on how well the driver/ motor operates?

Thanks.