Indicator status analysis in different operating modes Different operating status LEDs correspond to different lighting rules. If an indicator does not follow the normal rule for a certain period of time, it indicates that the hoist is running abnormally to detect the running status of the hoist. Most LED indicators show a certain pattern according to the timing in a certain working mode, and the lighting of a few LED indicators may be random in a certain timing period. For the LEDs that are turned on and off randomly, it needs to be judged according to certain operations. The working mode of the hoist is divided into three types: automatic operation, manual operation and overhaul (testing rope). In order to detect the running state of the hoist, it is necessary to analyze the rules of the LED indicators in the three modes in advance. LED status analysis process in automatic operation mode.

Enhancing the manifestation of faults in the electrical control system The mine has many types of fault sources, and the fault signs are different. It can be divided into three categories: single fault corresponds to a single fault source, and single fault source corresponds to multiple symptoms and multiple fault sources. Single sign. A part of the indicator light of the PLC can directly indicate the source of the fault. For example, the overspeed relay lights up to indicate overspeed, the work brake relay is powered off, and the part indicates failure symptoms such as safety loop relay AC power off, and the corresponding indicator light is off. The related fault sources are such as hoist running speed, hoist forward or reverse over-rolling, and switch GYD power-off. In order to clearly classify the faults of the electrical control system, a more complete fault tree can be established for analysis. The software structure of the host computer and the PC software on the display interface adopt modular design, including information acquisition module, LED position calibration module and fault detection module. The information acquisition module mainly collects the state image of the LED in real time.

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