Re: Spindle Speed with the GS2 Drive

[Gene Warren <gwarren-at-execpc.com>]

            Hi Paul,

        Upon closer inspection of the GS2 drive I can program the drive itself
  to accept 0 to 10 volts plus direction, so I won't need to do that kind
of  offset.  The GS2 drive also has a programmable output (0 to 10 volts
DC, 8-bit resolution frequency, current, or process variable) that could
be used for EMC feedback.  I need to get this drive and a motor and play
with it to understand it's full capabilities.

    Paul wrote:
> 20030326191634.USLV9882.mta02-svc.ntlworld.com-at-there">
>
> Hi Gene
>
> Some good news, and some not quite so good... EMC will control spindle speed 
> via a spare DAC on an STG type card. It is open loop only and is currently 
> set up for +/- 10V control. To add another parameter to the ini file to give 
> a zero point offset would be fairly simple to do. The only danger here is the 
> undefined state of the DAC prior to EMC being initialized might send your 
> spindle of at full speed unless there is an enable input to the GS2.
>   
  
         See my answer to Ray about this.
  
  Later, 
 Gene
> 20030326191634.USLV9882.mta02-svc.ntlworld.com-at-there">
>
>
> Another topic for discussion at EMC-Monday perhaps.
>
> Regards, Paul.
>
>
> On Wednesday 26 March 2003 1:04 am, Gene Warren wrote:
> >     Has anyone ever used the GS2-AC Drive in an EMC machine?  This
> > drive is speed-controllable via a Com. port or via direct relay-type
> > command.  You give it a speed code and it goes there. You can also
> > control the speed with a 0 to 10 volt DC input. 5 volts = 0 speed, 5 to
> > 0 volts one direction, 5 to 10 volts the other direction.  It has the
> > added advantage of running a 3-phase motor in either direction on
> > 1-phase incoming.  This might be good for tapping? It will not run a
> > 1-phase motor. About $400.00  They claim speed regulation to 0.1 Hz.
> >       
>
>