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

Give this a shot:

http://homepage.mac.com/johnatl/PhotoAlbum21.html

Regards,
JJ

On Tuesday, November 11, 2003, at 10:49 AM, paragon032003 wrote:

> Sorry for not replying back sooner I have been away for a couple of
> days....
>
> Ok Ill try and explain more clearly ....
>
> The stepper controller is using 12v at the Step / Dir pins on the
> euro connector.
> The Step/Dir on the L297 is at 5v so this is OK.
>
> The voltage is always High (12V) on the Step/Dir of the euro
> connector on the stepper card.
> What I think I need to is sink the 12v to ground producing a LOW.
>
> I have seen some circuits on the web that look like the below....
>
> 12v
> Step (from Eurocard)
>
> |
> |
> B | /C
> D0 --------R1K------|/ TR1
> |\
> | \E
> |
> |
> R
> |
> |
> ------------------------ Gnd
>
>
> Now from what I understand .. When D0 is High (5V) it basically
> grounds the Collector input (Step 12V) thus sending it Low.
> Now what I want is the reverse to this i.e. when D0 is low it the
> Step (12V) goes Low and when D0 is High (5V) the Step (12V) is High
> i.e. at 12V.
> Ideally an opto-coupler would be sitting between the Parallel port
> and transistor.
>
> Hope this explains a little more.
>
> TIA
> Steve
>
>
>
>
> --- In CAD_CAM_EDM_DRO@yahoogroups.com, RichD <cmsteam@s...> wrote:
>> 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.
>>>
>
>
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