Re: [CAD_CAM_EDM_DRO] Re: Running a BOSS on single phase

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