A Zero Point Offset Monitoring Method of Rotation Axis Based on Siemens 840D System

Abstract

Abstract In order to monitor the abnormal condition that the zero point of the encoder does not coincide with the actual mechanical zero position in the full-closed control loop of a rotating axis, a Siemens 840D numerical control system based on abnormal condition inspection method is proposed. According to the gathered data by the measurement system of a rotating axis servo motor, the logical comparison program in PLC (Programmable Logic Controller) is developed to monitor the zero point of rotating axis by using Siemens 840D numerical control system and STEP7 software platform. The verification experiment results show that the proposed method can quickly identify the abnormal displacement of the zero point for a rotating axis and disable the servo motor in time, which can effectively avoid the poor quality problem caused by the abnormal condition in rotating axis.