Re: Bridgeport BOSS4 wiring question

Thanks I wasnt really sure on that.
What is the prefered method to get the 3 phase conversion?
I am still trying to choose between a rotary and a VHD.
I do plan on converting the mill to servo's and build a new power
supply so I will be able to do setups on the table without having to
run a rotary phase converter till its needed for the spindle.

Thanks

Gary

--- In CAD_CAM_EDM_DRO@yahoogroups.com, Jon Elson <elson@p...> wrote:
>
>
> cncgramps wrote:
>
> > Has anyone every wired there BOSS4 so you could use single phase
> >straight to the controller?
> > What I would like to be able to do is have the controller run on
> >single phase and only use the 3 phase converter to run the
spindle
> >motor.
> > I know it is changed inside the main power box but just
wondering
> >if anyone has rewired theres in such a manner.
> > I think it would be nice to do setup work and even digitize
using
> >the axis motors without the need for a 3 phase converter running.
> >
> >
> I don't think you can do this. Most, if not all, BOSS 3-6
(stepper)
> machines
> have a 3-phase power transformer. The stepper power supplies use a
> saturable reactor to control motor current (and driver voltage).
I suspect
> this is tuned very carefully to the rectified 3-phase waveform,
and would
> cause all sorts of problems, either poor speed/torque or burned up
motors
> and driver cards if you just blindly switched it to a single-phase
power
> source.
>
> Jon