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

Hi Wally,

I had no problems with the motors on my mill when running them off 75V.
I did however have two geckos die of unknown causes.

Les

cnc_4_me wrote:

>
>
>
> 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
>
>
>
>
>
>
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