Computer-assisted Measurements in the Servo-drives Diagnostics Based on the Feedback Signals Evaluation

The paper concerns diagnostics of servo-drives. The proposed computer-assisted way of the feedback signals measurements can be applied as a simple and low cost solution useful for inspection and on-line monitoring of the servo-drives motional accuracy and also data collecting for later analysis. Despite the fact that the feedback devices installed in the servo-drives can be different the square wave signals are commonly used in position and commutation loops as their output signals. This kind of signals can be applied for quite simple in realisation digital measurements of both velocity and position increments. Lack of limitations in the distance and trajectory of the inspected movement as well as possibility to perform and repeat the tests on an operating machine without any interrupting its working process seem to be their valuable features. However, it is necessary to have at disposal quite simple but properly prepared equipment and right software instruments when a manufacturing machine with the servo-drives has to be inspected with different static and dynamic tests by this way.