Hello.
i have a disturbing question about closed loop, and true closed loop system.
looking at the centroidcnc website, they have the acorn, allin, and oak controller borads. i know closed loop mean the encoder feeds back to the drive, it's position, speed etc. but why some systems, the feed back are only between the encoder and drives, and others are from encoders, drives and controller card, i have seen this in AC servo systems, i am confusing about this because in the case of the acorn board, the specification say, it is NOT TRUE closed loop, and the oak controller board say it is TRUE closed loop, so what happen with the situation where the closed loop ends up in the drive, and the controller card does not receive any feedback signals? both are closed loop but what is the difference? if someone can explain me that please, i aprecciate it.
Noel.