controlling dc motor using PCI-7342 and MID-7652

[Paradigm]

Hi,

I am trying to control an electric linear actuator driven by a 24V dc motor (no encoder). The feedback is coming from an integrated analog linear potentiometer (+10v to -10V). I am using the automatic analog feedback vi and created my desired feedback profile. I began with a  Kp value of 9, all other gains set to zero for now. The problem is that there is a constant offset of approx. 8V between the desired profile and the actual feedback from the linear pot. I have ADC 1 configured as -10 V to +10 V. I am not sure if its a wiring problem or there is something that needs to be configured in measurement & automation, axis 1. I am new to motion control so bear with me.

Thanks

[TheWay]

Hi there,

Where are you measuring this 8V difference? Is it the difference between the servo output of the MID-7652 and the analog feedback input to the 7652 analog input channels?

If you try changing the PID constants in your control loop, does this 8V difference remain the same?

Way S.

NI UK Applications Engineer