This, and does not affect the original characteristics of CNC machine tools, so that some of the maintenance and purchase cycle and high price of teaching and control spare parts caused by the contradiction has been resolved. This paper introduces the whole process description of the Siemens CNC system plate partial damage emergency repair and Siemens spindle drive changer replacement, and introduces the method of the plate emergency treatment and the problem of the original and replacement of the inverter instead of the spindle module. Solution. After the CNC system and the servo module are damaged, the replacement module is usually used to solve the sudden failure in the field. However, in the case of lack of spare parts, sometimes the method of changing the emergency is adopted to restore the numerical control machine tool, which not only ensures the normal operation of the equipment, but also shortens the stoppage of the machine tool, thereby saving maintenance costs. Example 1: Equipment overview: Machine model: CH097 (produced by Great Wall Machine Tool Plant) CNC lathe failure phenomenon: Spindle motor operation sometimes slow response Diagnosis: According to the operator, the machine has failed for some time, when it is good or bad, the fault occurs. When the spindle motor does not turn, the spindle starts to run in about a dozen seconds. And can continue until the entire part is processed, no alarm number is generated in the whole process. First, in the OG state, the spindle is started, and occasionally the spindle runs slowly, and the corresponding input and output points are checked according to the PLC program. After inspection, the tool holder clamping switch, the spindle clamping pressure switch, the tailstock switch, etc. are all normal, and the Q100.6 has output as 1, so the spindle module is checked, the analog input terminals 56 and 14 are measured, and the voltage is 3.5V. (Depending on the spindle speed setting of the system), however, the X431 plug enable signal 65 has no 12V voltage, short-circuit the 65 and 9 ends of the X431 plug, the spindle can run, which means the system's measuring board may be damaged. The interchange with the measuring board of other machine tools has been confirmed. The measuring board model is: 6FXH214BA02. The wiring principle is shown in Figure 1: Since the measuring board main shaft simulates ftE, and the other two axes are normal, only the main enabling signal is bad. And the price of the measuring board is more than 10,000 yuan, so the following emergency check PLC program is used to find the output point of the redundant PLC. After looking for Q2.4, the PLC program PB3 segment is modified, and the Q2 is inserted after the output point Q100:6. 4. The original enable signal line is removed at the spindle module, and the Q2. 4 output is led to the spindle module X431 65. After the above changes, the spindle function returns to normal. The improved circuit is shown in Figure 2: City Machine Tool Plant production) CNC lathe Phenomenon: Short-circuit diagnosis of spindle motor: When the machine tool is working normally, the spindle module and the power module are damaged at the same time due to the damage of the spindle motor power line. After the spindle motor cable is insulated, the spindle module and the power module are removed. Replacement, the machine works normally, the servo and CNC system are normal, the power module model is: 6SC61122VA01, the spindle module model is: 6SC6113OHAOO, can be replaced by the corresponding 611A module, but after inquiry, the total price of the two modules is five About 10,000 yuan, and the supply cycle is long, affecting the normal production of the workshop. For this reason, we have adopted the scheme of replacing the inverter: after the calculation of the servo clock power (power selection according to the X, Z axis motor power Siemens drive planning Manual), using 6SNU451AA010AA1 (10/25KW) power module to supply the servo axis, the wiring method is exactly the same as the 6SC series module; for the inverter, according to the motor power and other parameters, combined with the use of the machine tool, we intend to use the vector inverter to transform. The requirements for the inverter are: 1. The motor can be controlled by vector control to ensure constant torque at low speed. 2. The analog input controls the speed and direction of rotation of the motor. 3, strong anti-interference ability, small external interference, ultra-low noise. After comparing the price/performance ratio of each brand inverter, the Shoumoto Mitsubishi Yasushi inverter FRA54015K-CH (15KW) was used instead of the meta-spindle module. The spindle motor still used the original two costs totaling 27,000 yuan. Since the spindle position encoder is mounted on the rear of the spindle and is directly connected to the system, it can be left unchanged. Implementation: Remove the original power module and install a new power module and inverter. Since the new power block and inverter are small in size, they can be directly installed in the electrical box, and the new power module does not need to be re-installed. The schematic diagram of the connection principle before the transformation is shown in Figure 3: Connection and commissioning: After the inverter and the spindle motor are connected, the power can be debugged. First, the numerical control system control signal and parameter number setting value parameter 7113 are applied to the motor, and the constant torque motor is selected. . 73100-5/0-10V selection, select 0-V, the polarity is reversible. 809 motor capacity, advanced flux vector control. 814 motor pole nine, advanced flux vector control. 83290 motor rated voltage, the setting should be less than 290. Relevant parameter setting: analog quantity is not connected with frequency conversion, separately debug the inverter spindle motor, according to the inverter and spindle motor, according to the inverter manual, input relevant parameters and make the inverter and motor The parameters are automatically optimized to test the spindle motor. After the above parameters are set, adjust the parameter “Automatic adjustment setting/status†of No. 96 to let the inverter automatically measure the motor to make the inverter match the motor better. After the inverter and spindle motor are debugged, connect the enable signal of the CNC system to the inverter with analog quantity, test the spindle motor, and adjust the system parameters to make the spindle speed linearly optimal. Note: The most important part of the whole transformation process is the interference of the inverter to the CNC system, including the interference to the servo axis. This is the key to the success of the entire transformation. The inverter and the CNC system are not connected (the enable and analog are not connected). During the online debugging of the inverter and the spindle motor, it is found that the inverter has interference with the servo module, sometimes the X-axis and sometimes the Z-axis drive module. The digital display is not normal and must be removed by the reset button on the system operation panel. To this end, we have taken the following measures: the input of the power supply (see the inverter control circuit), limiting the harmonics on the power supply, reducing the conduction of the converter and Radiation interference. 2. The control line is shielded. The connection between the motor power line and the inverter is carried out with a cable, and the shielding layer is grounded at both ends. Use a short thick line for ground connection at the same time. 3. The connection between the CNC system and the inverter is isolated as much as possible. 4. Whether the arc-extinguishing function of the contactor in the power-checking box is normal. Any AC contactor with R-C suppressor has heat and bulge. After taking the above measures, the interference is completely eliminated, and the inverter works normally after being connected with the numerical control system, and it is used for six months without failure. Part of the wiring principle after the transformation is shown in Figure 4: (Finish) Steel Door Hinge,Black Steel Panel Locks,Industrial Cabinet Steel Panel Lock ,Stainless Steel Cabinet Panel Lock Guangdong Haitan electric cabinet lock Co., Ltd , https://www.htcabinetlock.com