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

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

=20

________________________________


Hi Dave=20

I think that some constant load on the motor make yellow line flat - =
straight one.

So, I removed all pulleys from shaft of motor and that made motor ran =
free.

After I did that, and call X cmd pos, ran motor front and back and I can =
see some perpendicular part (0.4")  to the horizontal yellow line. =20

Does that mean something?

=20

Thank you,

aramk


On Dec 12, 2006, at 2:07 AM, Kasparov, Aram wrote:

> Hi Dave
>
> I am using MESA 5i20 card. Is any difference in tune up process=20
> makes type of card that in use? (MESA vr VITAL)
Not that I know of.
Tuning in velocity mode is a bit different than tuning in torque mode=20
but the goal is the same.
>
>
> Also, what is exact definition of "oscillate"?
   to move back and forth in a periodic manner as in a pendulum; sine=20
wave.
>
> Any motion of motor should send some signals and oscilloscope=20
> should show waves. If oscilloscope can't show wave it means that=20
> oscilloscope is not sensitive enough.
>
plotting position vs time should give you a nice sine wave at a given=20
frequency.
> So, can I say that oscillate means any motion of motor?
No, motion  in one direction is not oscillation; only when it goes=20
back and forth.

If P is set low you  will get no motion; as you increase P the axis=20
should get more and more jittery. Finally it should  sustain back and=20
forth motion. Don't do this too long; just long enough to make=20
certain it is not going to dampen out. Then multiply the P that =20
produced that by   0.6 and that is a starting value for P. When you=20
are doing this I and D are both set to zero.
After that works then go adjust FF1. That is my way of doing things.=20
Others have different procedures and they work also.
>
>