If it's a DC servo then you can simply change the polarity while also
swapping the pinout in the encoder accordingly.
I did swap the polarity once only and then looked for a couple of days
for the problem that the drive disabled with the first step...
Of course... the encoder has to be adapted as well.
Rainer

On Tue, Dec 29, 2009 at 7:35 PM, Steve Corboy <[email protected]> wrote:
>  Thanks Chris, that did the trick.
>
> Regards
> Steve Corboy
>
>
>
>> Message: 6
>> Date: Mon, 28 Dec 2009 20:26:05 -0600
>> From: Chris Radek <[email protected]>
>> Subject: Re: [Emc-users] Axis Direction Change with Servo System -
>>        How?
>> To: "Enhanced Machine Controller (EMC)"
>>        <[email protected]>
>> Message-ID: <[email protected]>
>> Content-Type: text/plain; charset=us-ascii
>>
>> On Tue, Dec 29, 2009 at 12:50:15PM +1030, Steve Corboy wrote:
>> >
>> > I understand how to do this with a stepper system - by changing the sign
>> of
>> > the input scale in the .ini file.  However, when I do this with a servo
>> > system, the axis happily charges off in one direction when powered on
>> > because now (presumably) the sign of the feedback no longer corresponds
>> to
>> > the sign of the table motion.  ie encoder counts are opposite sign to
>> table
>> > motion.
>>
>> Change the signs of both INPUT_SCALE and OUTPUT_SCALE.
>>
>>
>>
>>
>>
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-- 
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Rainer M. Schmidt
Complex Consulting LLC
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