Re: [Emc-users] Tune-upn AC servomotor

[Kasparov, A. <Ara...@ky...>]

Hi Dave

I am using MESA 5i20 card. Is any difference in tune up process makes =
type of card that in use? (MESA vr VITAL) =20

Also, what is exact definition of "oscillate"?

Any motion of motor should send some signals and oscilloscope should =
show waves. If oscilloscope can't show wave it means that oscilloscope =
is not sensitive enough.=20

So, can I say that oscillate means any motion of motor?

  =20

I am now moving to final stage of start putting controller/retrofitting =
Bridgeport machine for place where I am working.

What is min. torque needed to move X-axis of Bridgeport mill? I will use =
1 to 6 timing belt reducer.

Are any suitable motor from servo dynamics for that type of job?

=20

Thanks=20

aramk=20


________________________________

From: emc...@li... on behalf of Dave Engvall
Sent: Fri 12/8/2006 10:13 AM
To: Enhanced Machine Controller (EMC)
Subject: Re: [Emc-users] Tune-upn AC servomotor



Hi Aram,

A couple of things come to mind.
Check your servo amp with 9-10 vdc on the input.... a nine volt=20
battery is handy. :-)
The axis should move out smartly,  close to the maximum velocity you=20
want.
If it doesn't then adjust the gain on the amp until it does.

After that is verified then go back to tuning emc. IIRC typical P =20
values for the Vital card are in the low thousands.
Work toward getting P set at 0.6 times P when the axis just sustains=20
oscillation. Leave it there while you work with other parameters.

As for the halscope stuff: try getting on irc ... freenode.net   #emc=20
and you should be able to get help.

Dave
On Dec 8, 2006, at 9:30 AM, Kasparov, Aram wrote:

> Hi Dave.
>
> I am trying to see any wave type graph on oscilloscope but I can't.
>
> I star machine with very slow motion f0.01 in order to have enough=20
> time to start oscilloscope, load them up as it described in manual.
>
> I loaded signals:
>
>  sig Xpos-cmd     (position command)
> sig Xpos-fb      (position feedback)
> pin pid.0.error  (position error)
> sig Xoutput      (PID loop output)
>
> I only can see one yellow line and two read ones.
>
> If I reduce P to 20.0 then I can't see yellow line at all.
>
> I increased P to 583 (randomly pick that figure) and machine moves=20
> very slow no matter how big F feed I put in.
>
> When P is small than machine moves faster indirectly from volume of=20
> F feed.
>
>
>
> Am I doing something wrong?
>
>
>
> Thanks
>
> aramk
>
>