The sensor fault of Kobelco excavator should distinguish the type of sensor output signal: digital signal (output range: 0 or 1) or analog signal (output range: 4000~20000). μ A) And then conduct troubleshooting according to the actual fault performance.
1. Digital signal sensor failure and troubleshooting when the digital signal sensor fails, the control system will have a clear fault prompt. Firstly, the fault alarm shall be confirmed to determine whether the system alarm is really caused by sensing fault. For example, when the water level sensor gives an alarm, the prompt flashes continuously on the display. At this time, check whether the water level is too low and reaches the alarm water level. If there is no such phenomenon, check the sensor again. Since the output signal of this kind of sensor must be 1 during normal operation, when the output signal of the sensor collected by the system is 0, the system gives a fault prompt, so the short-circuit method or direct measurement method is used for fault judgment. The short-circuit method steps are as follows: disconnect the sensor circuit plug, short-circuit the power line and signal line on the control circuit end plug, and check the corresponding input signal of the system: "1" indicates sensor fault, It shall be replaced or repaired; "0" indicates that the control circuit is open circuit. Find and connect the open circuit point or replace the circuit. This method is applicable to quickly judge the fault without measuring tools. If there are measuring tools, the measurement method can be used to judge the fault.
2. Measuring method steps: disconnect the plug of the sensing circuit and directly measure the power line and signal line on the sensor: "path" indicates that the control line is faulty, and the open point should be found and connected or the line should be replaced; "open circuit" indicates that the sensor is faulty and should be replaced or repaired.
3. Such faults are clear and easy to check and eliminate, such as water level sensor, oil level sensor and various travel limiters. If there are no accessories to replace or the replacement is not allowed on the construction site, under the premise of ensuring the safety of equipment and personnel, force can command the virtual sensor to work normally to achieve the operation in emergency situations such as equipment displacement.
