The hardware requires a portable industrial grade computer tester that is easy to carry to the commissioning site. One analog ±10V output interface: full electrical isolation, isolation voltage ≥ 500V, at least 12-bit resolution. Two-way encoder signal interface: high-speed full electrical isolation, isolation voltage 2500V, maximum signal frequency 1MHz, with hardware digital filtering. The functional speed servo unit should be tested: forward and reverse servo gain (rmin-1V-1) test; zero drift test; speed step response curve test and analysis. Test of position control loop: test and analysis of position response curve. Contour error test: error analysis of linear and circular interpolation; contour transition error analysis. Test step speed servo drive unit test applies step voltage input to the servo drive unit, measures the speed response curve, gives performance parameters such as overshoot and rise time by analyzing the response curve, and adjusts the servo according to the response curve and performance parameters. The potentiometer (analog servo) or parameter value (digital servo) of the drive unit enables the servo drive unit to achieve the desired dynamic response performance. (1) Connection method description: Each axis separately adjusts the dynamic response of the drive unit. The motor must be connected to the actual machine for testing to bring the drive to its ideal state under real load. (2) Test step coarse adjustment zero drift set 0V voltage output, adjust the corresponding potentiometer (or parameter) of the servo unit, so that the measured motor speed is approximately zero. Fine-tuning zero-drift setting 0V voltage output, adjust the corresponding potentiometer (or parameter) of the servo unit, so that the measured motor position changes as close to zero as possible. Adjusting the servo gain to set a voltage output (for example, 1V), the gain parameter rmin-1V-1 of the servo unit can be calculated by the motor speed tested. Generally, the output voltage range of the numerical control system is -10~+10V. In order to ensure the speed regulation accuracy and leave an upward adjustment margin, the servo unit is usually set to input voltage of 9~9.5V, and the motor reaches the maximum speed (corresponding to G00 moving speed). . Adjust the corresponding potentiometer (or parameter) of the servo unit to meet the above requirements. For example, if the movement speed of a certain axis G00 is 2000r/min for the corresponding motor speed, and the 9.5V corresponds to 2000r/min, the servo unit must be adjusted to 210rmin-1V-1. Adjusting the servo gain forward and backward consistency The motor speed is measured by setting a positive voltage (for example, 1V). Then measure the motor speed by setting the corresponding negative voltage (for example, -1V), and adjust the corresponding potentiometer (or parameter) of the servo unit so that the servo gain is as uniform as possible when the motor is reversing. Set the parameters of the step command curve. N1 is the base speed of the step response. For example, to test the step response at zero speed, T1=0, N1=0. The output step command curve is tested. The test shows a positive step response curve (time T2), and parameters such as overshoot and rise time are calculated. Adjust the corresponding parameters of the servo unit regulator and retest until the dynamic response performance is satisfactory. Note: In order to prevent the deviation of the contour movement caused by the limiting action of the current loop, the current loop should not enter the limiting zone when the machine is contoured. Therefore, the selection of the step quantity should not cause the current loop to enter the limiting area, and its selection is related to both the servo system and the machine tool. Usually the step amount (N2?N1) should be at least 10% of the maximum speed. Contour error test (1) The connection method is the same as the position control loop test. (2) The test process runs as follows. The machining program 0 tests the actual motion profile of the motor. During the contour transition, pay attention to whether the servo unit of the X and Y axes enters the current limit zone (there are most corresponding indicators in the servo unit). If the indicator of the servo unit entering the current limit area is on, increase the speed and time constant of the X and Y axes at the same time, and test again until the X and Y axes do not enter the current limit area. Display the contour test curve, enlarge the curve, amplify the error, and observe the error of the contour motion. Conclusion When the CNC machine tool main engine factory performs the online debugging of the CNC system, the feed servo system and the machine tool host, it is important to accurately and quantitatively adjust the speed and position control parameters. Our ST?1 servo system online tester can complete all the above test items and is already in use on site. (Finish) Aluminum Round Bar,Aluminum Flat Bar,Aluminium Square Bar Jiangyin Kaxite Energy-Saving Materials Technology Co., Ltd , http://www.challaluminum.com