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Dongfeng 7 Series is a widely used diesel locomotive shunting locomotives. In electrical control, use electronic constant power regulator to achieve constant power excitation , but there is no effective means of its testing and maintenance testing . Extensive use of the railway system at this stage electronic equipment test stand mostly developed in the late 1990s . Dongfeng seven existing diesel locomotive constant power test stand were analyzed and found its interior is dominated by some of the toggle switch with the combination of measurement instruments , there is a simple function, low accuracy , complicated operation and other issues ; their way of testing and implementation function is lagging behind . Since there are a large number of contacts with electrical components hard logic , often occurs due to the contact breaker , virtual access, short circuit failures and other issues , and the logic once constituted , modifying , debugging more difficult. Test status and results of multi-use digital control with LED display, test data is not intuitive , it is difficult to achieve automatic recording . Meanwhile, there are complicated operation , low power consumption , high cost , poor stability , has been unable to meet the testing needs now , bring a lot of inconvenience to the repair work . In order to improve Dongfeng 7 diesel locomotive constant power excitation cabinet overhaul capabilities and test accuracy , improve work efficiency, shorten the test cycle , we choose to use force control configuration software , IPC , PLC combined solution , the test station re- design, design a fully functional , intuitive interface, workable detection system. It can be achieved and the whole board test, remote operation and management of real-time dynamic display of system operating conditions , historical operating data query and print , as well as save and print reports curve and many other features . As a result of the configuration software and IPC combination. The new test stand and has design and development cycle is short , easy system improvement and upgrade advantages.
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