PLC controller in the application of the lawn mower test-bed

1, the introduction of mowing machine developed by our company in the transmission process, to test the operation condition of the lawn mower transmission condition, specially designed for lawn mower transmission production test rig. Test bed can simulate gearbox actual working condition, and to measure and shows its speed, torque, vibration, performance parameters, such as radial pressure and body temperature, after system background data processing and comprehensive analysis of the generated test report. Users can easily finish all kinds of test, and get the corresponding report. System function is well-found, good man-machine interface, easy operation, strong anti-jamming capability, has been put into practical application. On-off device of the test bench test for transmission with a clutch mechanism and increase function, mainly used for on-off device life test. Start to design the circuit for use JS7 time relay control circuit, control circuit, wiring is complex, and electric relay long-term work, relay contact is easy ageing, relay mechanical life also cannot meet the requirements. As the equipment running time longer and longer, fault point increase, maintenance workload is more and more big, seriously affect the safe operation of the mower test-bed. In order to guarantee the safe and stable operation of the test, need to modify the original relay control system. 2, the implementation of the project brief introduction of the project in order to meet the requirements of working condition of test lawn mower transmission clutch life test with on-off device. Test requirements: a continuous run of 150 hours, the clutch gear mesh / 10 seconds time, clutch gear separation / 5 second, namely on-off cycle for 15 seconds. 150 hours of clutch cycles for 36000 times. The experiment purpose is: ( 1) Tests clutch spring tension and life can guarantee clutch test 36000 times; （ 2) Test the lawn mower transmission under the condition of load transmission clutch gear clutch and wear condition. The two standards, to ensure safe and reliable on-off device. The scheme design, project implementation in 2004, through a light load test, the loading experiment prove that the result is good. The function is all ready, stable and reliable, and put to test up to now, has achieved good social benefits and economic benefits. 3, system composition lawn mower transmission test-bed on-off device of PLC control system based on programmable controller PLC as control core, execution, sound and light alarm, and primary and secondary peripheral components. CPM series PLC in such aspects as programming environment, it not only has the past, the functions of small PLC is used as small controller or in sensor controller application, and can adapt to different requirements of production area. So we chose to use programmable controller model for CPM2A - 20 cdr - D。 This machine is small in size, can communication with the computer, easy to monitor, debug and troubleshooting, enrich and perfect the maintenance, the maintenance method of test bench, improve the level of automation. This system is a total of five input point and 5 output points, PLC choose AC220V power supply voltage and rated input voltage PLC internal power DC24V, rated output voltage PLC external DC24V power supply, the output current is 2 a/point, USES the relay output, use ladder diagram program expression form, this system is set up automatic only way to work. Below for PLC external I/O interface ( See figure 1) And the ladder diagram ( See figure 2) 。 Figure 1 PLC external I/O interface 4 many time delay circuit and count circuit, programming skills will be made according to certain steps, the chain and interactive relationship between each action will be complex, if use general logic programming, can make the program becomes tedious and complicated. Using programmable controller ( PLC） Provide counter in the instructions, also can complete the long time delay circuit. The program is not only simple, intuitive, and the programming method is simple, easy to grasp. Below for the purpose of this procedure the establishment method of a brief description: figure 2 clutch test procedure ladder diagram the ladder diagram, the long time delay circuit by 1. 0 seconds the clock pulse and counter CNT000, CNT001, CNT002 composition, respectively, for the second time, timing, and hours of time, set the number of hours as 150 hours. Gear clutch time control consists of TIM003, TIM004 adopts interlocking method, clutch cycle is 15 s/T and gear meshing and separating time 10 seconds 5 seconds of swaps. Toggle switch closure action principle, operation condition, press start button, run indicator, start the time long time delay circuit, realizing the second, minute, hour counting; Also TIM003, TIM004 take 10 s, 5 s regular work alternately, realizes the gear clutch, clutch counter to start counting, in order to test personnel to monitor clutch. Gear clutch electromagnet work began to electricity, power outages, pulled by electromagnet clutch gear clutch spring. Test process as the main motor stalling or cooling down, alarm indicator, malfunction remind test, troubleshooting, press the alarm to terminate button, the alarm light is out. Test time to boot up 150 hours ( Or counter displays 36000 times) , 1002 test time to indicator, stop running. Operating conditions toggle switch off. For the next test. PLC controller control wiring diagram as shown in figure 3. Figure 3 PLC control wiring diagram
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