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Subject: | Re: VAL field in Motor record Default unit |
From: | "Paduan Donadio, Marcio" <[email protected]> |
To: | "[email protected]" <[email protected]> |
Date: | Mon, 13 Feb 2017 20:33:18 +0000 |
Hi, Joey.
Independently of EPICS, I think you will find the same behavior when using Galil Tools, sending commands directly to your motor. Did you try PAA=xxxxx, BGA, PAA=yyyy, BGA, with xxxxx and yyyy corresponding to the same absolute positions in steps as the one
you tried with the motor record?
I think you will face the same problem independently of the software you use to communicate with Galil.
Cheers,
Márcio Paduan Donadio.
De: [email protected] <[email protected]> em nome de Joey Thai <[email protected]>
Enviado: segunda-feira, 13 de fevereiro de 2017 12:04 Para: Mark Rivers Cc: Matt Dentinger; [email protected] Assunto: Re: VAL field in Motor record Default unit Hi Mark,
Do you have any tips on how to proceed with this route using a potentiometer for a feedback loop?
Best,
Joey Thai
On Mon, Feb 13, 2017 at 11:50 AM, Mark Rivers
<[email protected]> wrote:
You cannot really control a D.C. motor without an encoder. I think the effect you are seeing correlating VAL with velocity is because the error signal (target position minus current position) is larger for a larger VAL (target position). It the controller has no feedback on the current position or velocity. I would expect that at some point it would issue a "following error", but I have never used the Galil so I'm not sure. |