Re: [CAD_CAM_EDM_DRO] Re: Modular 3, 4-axis Bi-polar Chopper Driver Help

On Sun, 15 Jun 2003 06:32:30 -0000, you wrote:

>--- In CAD_CAM_EDM_DRO@yahoogroups.com, Harvey White <madyn@i...>
>wrote:
>> On Sun, 15 Jun 2003 01:40:13 -0000, you wrote:
>>
>> >2.) What is Rx1? It says it's optional and it's only required if
>off
>> >board current control signal?
>>
>> Don't know without the schematic.
>>
>> Hope this helps...
>>
>> Harvey
>>
>Thanks for the help,
> The schematic, parts list, and other files for the board are here
>http://www.pilotltd.net/cnc.htm. Just incase anyone else is
>interested.

While I'm not familiar with the 6203, and don't need to look it up for
this, the L297 I am familiar with. The maximum motor current is
controlled by the pot. Current rises until the sense voltage exceeds
the control voltage (pot), then the driver shuts down... this is the
chopper current limit. I'd suggest reading the application notes at
the allegro micro website, they are very informative.

If you remove the R8, and then run put in RX1, as also a 4.7 k
resistor, you will be able to shut down the motors by reducing the
current limit. You'd do this by dropping the external current control
(reference) from some stable value (5 volts is fine) to zero.

The pot will allow you to control each stepper individually.

Harvey

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