make a servo motor oscillatory

[Linus33]

Hi,

I have two questions.

1.

I am using PXI/PCI-7344 to control a servo motor.

the system that I want to make is a system when its attempts to achieve a position result in oscillations that never dampen.

I know that I can use pid functions with pid control loop parameters to tuning servo motor.

However, Proportional Gain (Kp) have to be positive in this case(damping).

so what I need is negative proporational gain.

Do you have any ideas on this case(oscillatory)?

2.

I'd like to manipulate a servo motor manually. Although I was about to use flex_load_dac(), I gave up using it since I read the thread that It should not be worked.

so is there any idea to manipulate a servo motor? (PXI/PCI-7344)

If you have a good exmaple vi code, could you share it?

Thanks,

Linus Wooram Jeon

[Maclean]

Hi Linus,

Thanks for posting to the NI forums!  I am confused about your first question.  Positive proportional gain would create positive feedback and rail the system every time.  Are you saying that is what you want, or that is what you want to avoid?  The derivative gain dampens oscillation, so try increasing that.

What do you mean by manipulate the motor manually?  Do you mean with a control from the front panel, or do you mean kill the drive and turn it with your hand?  Can you explain your application so that I can get a better idea of what it is you are trying to achieve?

Regards,