Normal stepper motors can lose steps for various reasons. This results in loss of position precision. With a Closed Loop Stepper aka Hybrid Servo Drive this can be avoided. In a Closed Loop system the step motor has an encoder at the end. The encoder counts the actual steps and sends that information back to the controller that again can compensate for lost steps.
In this video I test the system and try to change some driver parameters using the RS232 interface and a all Chinese program.
7 мар 2016