Position control with RMC70 online controller

Forum: Motion Control Motion System Design
1

Hello,
inspired by webinars I played with RMC online controller and tuning the simulated system (position control). I have noticed something that appears strange to me. For example, the system is in steady state in position 10 mm. When “Move absolute” command is sent to the controller, there is first negative velocity shown in the Plot

RMC70 position move
RMC70 position move1491×781 164 KB
before the system actually starts to move. This is strange. I don’t see a reason why target velocity is calculated to be a little negative at first?

I have uploaded the plot for you to see. I’m not sure why this is happening.

Regards,

Pandiani