RE: Parameter PERIOD

[Ray Henry <rehenry-at-up.net>]

Comments scribbled throughout.

At 08:09 AM 4/14/2000 -0400, Bert wrote:
>
>Thanks Jon I will try that in the weekend.

I'll put together a tar of my run and ini and attach off list.

>What I would like to know is,
>what is the idea behind simulating a servo motor,
>when you want to control a stepper without feedback?

I believe that the idea here was to build in all of the PID stuff so that
we would have the ability to throw around the heavy loads that are common
to bridgeport stepper machines. 

>
>Bert
>
>-----Original Message-----
>From: Jon Elson [jmelson-at-artsci.wustl.edu]
>Sent: vrijdag 14 april 2000 01:11
>To: Multiple recipients of list
>Subject: Re: Parameter PERIOD
>
>
>
>
>
>Bert Eding wrote:
>
>> Ray,
>>
>> I did the changes below in my ini file,
>> the software was working using steppermod,
>> no problems with ESTOP and MACHINE ON.
>>
>> I changed to freqmod and it seems to be running,
>> I see the heartbeat of the motion task.
>>
>> Now using freqmot, when I try to move,
>> I get "command cannot be executed until
>> the machine is out of estop and turned on",
>> what could be wrong?
>>
>> I have got nothing connected to the parallel port,
>> but this is not needed if I have no feedback, right?
>>
>> I also remember to see a following error somewhere,
>> I can't reproduce it anymore, but there should not
>> be any following error, since there is no position feedback,
>> should there?
>
>But there IS, software feedback, simulating a servo motor.
>The following error is why you got stuck in between estop and
>run.  This is the state it goes to when a following error ocurrs.
>Hit F2 to get back to the "Machine On" state.  Depending on which
>UI you are using, you may have to acknowledge an error
>dialog box that pops up off the screen area you are viewing, so
>you may have to scroll around and look for it.
>
>> Maybe someone has a working system with nothing connected to
>> the parallel port, using freqmot and  tkemc, if so could you post the
>> ini file?
>
>The following error is because the P (Proportional gain) parameter
>is too low for the speed you are trying to move at.  So, just turn
>it up a good percentage, and try again.  You will soon see that
>moves up to some limit speed will be OK, and above that will
>lag farther and farther behind the longer you move, eventually
>triggering the following error.  By raising the P value, you should
>be able to supress this trouble.

I set P = 1000 for all axises in my freqmot version of ini.

>
>Jon
>

Ray