Re: Running a BOSS on single phase

> The BOSS stepper drives do NOT use a DC power supply. They use
> a magnetic amplifier in the AC feed to each stepper axis' power

supply.

> The idea is the DC supply sags to about 18 V or so when the motors

are

> standing still, as the reactor/amplifier is driven into saturation

by a

> control
> winding. When the axis needs to move, the control winding is

turned

> off, and
> the DC supply rises to, I think, about 54 V DC.
>
> So, you can't just plug a standard DC raw supply in there without
> keeping the
> magnetic amplifier working.
>
> Jon

Can anyone confirm the 54 volt limit on a boss stepper system? If
the modern 70 volt gecko PWM drive has a problem driving the stepper
to full power, the old boss stepper system must have been pathetic.


Wally

--- In CAD_CAM_EDM_DRO@yahoogroups.com, Jon Elson <elson@p...> wrote:
> Doug Fortune wrote:
>
> >Scott wrote:
> > >I am eventually going to convert to a modern control
> > >Big problem, I think, is the stepper drives get power from a
> > >3 phase transformer.
> >
> >The spindle motor (3 phase) and stepper/servo drives (DC)
> >don't have to be powered from the same source. Use 3phase
> >(or 2phase to 3 phase 220V phase converter for the spindle)
> >and 120VAC to power the stepper/servo drives (through a DC
> >supply, of course).
> >
> >However I'm not sure thats the answer you are looking for, if you
> >mean to use all of the existing BOSS electronics....
> >
> >
> The BOSS stepper drives do NOT use a DC power supply. They use
> a magnetic amplifier in the AC feed to each stepper axis' power
supply.
> The idea is the DC supply sags to about 18 V or so when the motors
are
> standing still, as the reactor/amplifier is driven into saturation
by a
> control
> winding. When the axis needs to move, the control winding is
turned
> off, and
> the DC supply rises to, I think, about 54 V DC.
>
> So, you can't just plug a standard DC raw supply in there without
> keeping the
> magnetic amplifier working.
>
> Jon