Re: [CAD_CAM_EDM_DRO] Re: L297 / L298 Help Required Pls!

Steve,
You have to fill in more detail.
Where exactly are you checking this 0-12V?
At the output of the L298? or the input of the L297?
The L297's are 5V logic devices only.
The input to the L298's are too, but the outputs (motor coil drives)
are whatever the motor supply voltage is. Is this the 12V you mention?
The outputs (motor coil drives) are phase drive and will seem weird
to see a correspondence to the step input.
Otherwise, I see no problem so far.
What IS the problem you have? Does the motor not step with step input pulses?
RichD


paragon032003 wrote:

>
> John / Rich
>
> Thanks for your reply's!
>
> This is what I have found since the original post...
>
> The stepper driver cards are running at 12V for hi.
> On the logic board there are three ILD74's (Dual opto transistors)
> these are accepting between 0-3.5V Lo/Hi respectively its set high by
> default then pulses down to low (step takes place) then back to hi on
> the output side a single pin reads 12V and pulsates down to 0 this is
> connected to the stepper drives the DIR side is the same but toggle
> between high and low (high = Clockwise).
>
> Does this make any sense?
>
> I presume that when the logic side goes low it sinks the 12V side to
> ground via a resister this then produces a low.
>
> Does this sound likely?
>
> TIA
> Steve.
>