For some large concrete mixing plants, their overall control is based on the PLC control system. In their operation process, especially in some harsh environments, various electrical failures are easily caused by external factors, thus affecting the operation of the concrete mixing plant.
During the operation of concrete mixing plant,

some sensor devices will affect the accuracy of information collection due to the interference of working environment, thus obtaining inaccurate information and causing various information failures. In order to avoid the occurrence of this problem, the circuit board in the system needs to be sealed through the sealing box to prevent the signal collection due to dust and humidity and ensure the accuracy of its collection information function. Different sensors should be measured in different ways.

Generally speaking, for the compaction sensor, if the data of the instrument panel of the PLC control system is found to be abnormal, the sensor can be detected by the voltage detection method and the sensor resistance value measurement method to determine whether there are problems.
As for the electromagnetic reversing valve, the operating mode can be judged through manual control to observe whether it can be commuted, and then the voltage value can be tested through multimeter to ensure that the voltage value is within the rated range of the electromagnetic reversing valve. For the pneumatic control valve, considering that there is a large amount of water vapor in the circuit and ice is easy to occur under low temperature conditions, the control valve can be guaranteed to operate stably by adding hot air. In the process of electrical element detection,

in order to ensure the accuracy and reliability of the test results, the components are often tested by replacing the original components. Therefore, proper components should be prepared in advance to facilitate timely replacement during detection. during detection.