--- In DynoMotion@yahoogroups.com, Tom Kerekes <tk@...> wrote:
>
> Hi Brad,
>  
> The Gecko 203V need its inputs to source and sink current.  Open collector outputs only sink.  Try selecting Output Chan0 to 8 to switch KFLOP's outputs to LVTTL.
>  
> Regards
> TK 
>
> --- On Wed, 6/29/11, bradodarb <bradodarb@...> wrote:
>
>
> From: bradodarb <bradodarb@...>
> Subject: [DynoMotion] Motor jogging
> To: DynoMotion@yahoogroups.com
> Date: Wednesday, June 29, 2011, 8:55 AM
>
>
>  
>
>
>
> This is my first experience with the kflop and I have a lot to learn.
>
> I made a test rig last night with an old gecko 203v I had around.
>
> I have connected to it a nema 23 motor.
>
> As far as connections to the kflop go:
>
> GECKO KFLOP
>
> STEP connected to pin 15
> DIR connected to pin 16
> COMMON connected to pin 25
>
> When I fire things up, the motor holds. If I go to Digital IO screen in KMotion application I can get the motor to step by toggling bit 8
>
> I have the axis channel 0 set to no input and stepdir for output
>
> and 0 for the output channel(which I read as open collector).
>
> So, while I can manually step the motor, I must be missing a configuration step because I cannot jog in either the console or the CNC application.
>
> Please advise,
>
> -Brad
>

--- In DynoMotion@yahoogroups.com, Tom Kerekes <tk@...> wrote:
>
> Hi Brad,
>  
> No I don't think it is a "dead band".  There is a potentiometer on the Geckos that can help with that low speed resonance (250-400 full steps per second).  The circuit they use ends up with a current offset which is a function of your motor inductance and supply voltage.  This current offset results in a distorted current waveform which excites any resonance.  The pot corrects for this offset and results in a nice sinusoidal current waveform.  Use KFLOP to Jog at the speed that sounds the worst and adjust the pot to see if it goes away or at least diminishes.
>  
> Regards
> TK
>
> --- On Wed, 6/29/11, bradodarb <bradodarb@...> wrote:
>
>
> From: bradodarb <bradodarb@...>
> Subject: [DynoMotion] Re: Motor jogging
> To: DynoMotion@yahoogroups.com
> Date: Wednesday, June 29, 2011, 2:30 PM
>
>
>  
>
>
>
> Thanks Tom, that did the trick!
>
> I have some nasty resonance around V = 2500 until about V = 4000.
>
> I thought I saw something around this forum related to it. I think it has to do with 'dead-band'?
>
> I use servos at work so the whole stepper thing is new to me. Makes some sweet noise on the accel ramps though.
>
> -Brad
>
> --- In DynoMotion@yahoogroups.com, Tom Kerekes <tk@> wrote:
> >
> > Hi Brad,
> >  
> > The Gecko 203V need its inputs to source and sink current.  Open collector outputs only sink.  Try selecting Output Chan0 to 8 to switch KFLOP's outputs to LVTTL.
> >  
> > Regards
> > TK 
> >
> > --- On Wed, 6/29/11, bradodarb <bradodarb@> wrote:
> >
> >
> > From: bradodarb <bradodarb@>
> > Subject: [DynoMotion] Motor jogging
> > To: DynoMotion@yahoogroups.com
> > Date: Wednesday, June 29, 2011, 8:55 AM
> >
> >
> >  
> >
> >
> >
> > This is my first experience with the kflop and I have a lot to learn.
> >
> > I made a test rig last night with an old gecko 203v I had around.
> >
> > I have connected to it a nema 23 motor.
> >
> > As far as connections to the kflop go:
> >
> > GECKO KFLOP
> >
> > STEP connected to pin 15
> > DIR connected to pin 16
> > COMMON connected to pin 25
> >
> > When I fire things up, the motor holds. If I go to Digital IO screen in KMotion application I can get the motor to step by toggling bit 8
> >
> > I have the axis channel 0 set to no input and stepdir for output
> >
> > and 0 for the output channel(which I read as open collector).
> >
> > So, while I can manually step the motor, I must be missing a configuration step because I cannot jog in either the console or the CNC application.
> >
> > Please advise,
> >
> > -Brad
> >
>