The diagnosis of pressure faults is carried out after each sampling of pressure signals by the PLC
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The diagnosis of pressure faults is carried out after each sampling of pressure signals by the PLC
In one expansion cycle from 0 to t4, corresponding diagnostic control values were set at different time periods according to the rules of pressure changes. They are a thin line in Figure 2. In addition to the time period from t1 to t4, in order to simplify the processing method, a constant value is taken as the control value. For example, in the period from 0 to t1, the liquid bag is in elastic deformation, so the pressure measurement value increases very little. In the time period from t3 to t4, due to the rapid pressure relief of the hydraulic system, the pressure drops rapidly to near zero, so the descent process is ignored and only the normal pressure relief effect is diagnosed. During the period from t1 to t2, the inner wall of the expansion joint is undergoing plastic changes, and this section periodically determines whether the pressure rise falls within the control range based on the pressure rise rate value. Different expansion joint diameters and pipes have different expansion joint times and pressure control values, which are determined by sample testing to determine their parameter values.
When the diagnostic program detects a fault, the PLC immediately stops the expansion reaction and displays the cause of the fault. The fault display is completed by the TD200 module. TD-200 is a display module that is compatible with S7-200 PLC. It can not only display dynamic pressure measurement values in real time, but also output up to tens of alarm statements under PLC control. The localized TD-200 serves as a visual and reliable display for the system. The S7-200PLC has a small capacity and memory, so diagnosis is limited to the normal hydraulic source. Although it cannot complete all fault diagnosis, it can diagnose components that are often prone to faults such as pressure sensors, booster cylinders, and expansion joints without increasing hardware investment. This is very meaningful for improving the quality and reliability of expansion joints.
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The diagnosis of pressure faults is carried out after each sampling of pressure signals by the PLC
In one expansion cycle from 0 to t4, corresponding diagnostic control values were set at different time periods according to the rules of pressure changes. They are a thin line in Figure 2. In addition to the time period from t1 to t4, in order to simplify the processing method, a constant value is taken as the control value. For example, in the period from 0 to t1, the liquid bag is in elastic deformation, so the pressure measurement value increases very little. In the time period from t3 to t4, due to the rapid pressure relief of the hydraulic system, the pressure drops rapidly to near zero, so the descent process is ignored and only the normal pressure relief effect is diagnosed. During the period from t1 to t2, the inner wall of the expansion joint is undergoing plastic changes, and this section periodically determines whether the pressure rise falls within the control range based on the pressure rise rate value. Different expansion joint diameters and pipes have different expansion joint times and pressure control values, which are determined by sample testing to determine their parameter values.
When the diagnostic program detects a fault, the PLC immediately stops the expansion reaction and displays the cause of the fault. The fault display is completed by the TD200 module. TD-200 is a display module that is compatible with S7-200 PLC. It can not only display dynamic pressure measurement values in real time, but also output up to tens of alarm statements under PLC control. The localized TD-200 serves as a visual and reliable display for the system. The S7-200PLC has a small capacity and memory, so diagnosis is limited to the normal hydraulic source. Although it cannot complete all fault diagnosis, it can diagnose components that are often prone to faults such as pressure sensors, booster cylinders, and expansion joints without increasing hardware investment. This is very meaningful for improving the quality and reliability of expansion joints.
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