Help for best motor current set up

[tonyno]

Hi to all
>
> could anyone me confirm if the following considerations are correct regarding my application with the G201 driver?
>
> My hardware is:
>
> switch power supply, with 56 VCC, 5 A (for a total of 4 motors)
> Sanyo-Denky step motor 103-H7126-0140 (the data sheet is attached)
> PMDX-131
> 4 G201 step drivers
> Mach2/3 control SW
>
> In bipolar series configuration I use a resistor of 28500 ohm (
(47500*0.75)/(2-0.75) ), without jumper (in reduced current range); in this
configuration I have some problems of resonance near to the 60% of the maximum speed (3000 mm/min; the resonance is not dumped by the driver)
>
> In bipolar parallel configuration I use a resistor of 12954 ohm (
(47500*(.75*2)/(7-(0.75*2) ) in normal driver operation range; any resonance problems but the motor don’t work so good (the max speed is to low); it work’s best with a 27000 ohm resistor, but I don’t understand why.
>
> So, I have a little bit confusion on the value resistor calculation because I’m not sure if the amperage that I consider in the formula (0.75 for the bipolar mode) is correct for the best hardware performance.
>
> Could anyone me suggest the best set-up with this hardware (or suggest witch could be the optimal configuration)?
> There is a special set-up in Mach SW (when combined with the geko?)related to the Minimum Pulse With option and the Direction Precharge,?
> There is a smart formula that can help me to calculate the torque related to the ampere that flow in the motor turns?!

tanks to all