At present, the servo system inverter and the input part of the faulty equipment are prone to occur on the market. The computer sewing machine is mainly developed and marketed around 2008. The new equipment has low failure rate due to technological innovations such as servo system.

       Servo system inverter failure ---

       In the fault of the inverter part of the servo system, it is common that the inverter power module is burned, causing the display to be turned on, and the operation does not respond and alarm.

       Under normal circumstances, the power module will burn and cause the isolation drive circuit to be damaged. Therefore, when it is checked that the power module has been burned, it is necessary to check the drive circuit in detail, especially the isolation optocoupler.

        At the same time, we must confirm that the drive circuit is intact before the power module can be replaced. Otherwise, after the module is replaced, the test machine will be burned out in an instant, causing unnecessary waste. There are many types of power modules. When replacing, we need to use modules with the same model and the same specifications.

       Input partial failure ---

       For the failure of the input part, the author believes that most of the fault phenomenon occurs in the sensor part. Because in the closed-loop servo control system, in order to feed back the control signal to the control system, the sensor is inevitably used in the actuator, and the sensor is a more susceptible part of the mechatronic system. Therefore, the system generally has a sensor failure. Error prompts and sensor test procedures for easy daily maintenance.

        The parts of the sewing machine servo system equipped with sensors are: upper needle position, lower needle position, speed measurement, safety switch, pedal start, x and y origin and presser foot.

  According to the analysis, there are sensors that are generally required to be positioned and positioned. For different applications, the sensors are not the same.

         In general, the fault of the sensor is: when the power is initialized or started, that is, when the machine is looking for the correct position of each point, it cannot be confirmed and is in a malfunction state. After a few seconds, the detection is stopped and the fault code is displayed.

        When we repair, we should follow the fault code. We can directly find the failed sensor, and then call the input test program to confirm. If it is not enough, only the damaged sensor can be replaced.