What is the inspection method of the fault sensor of the weightless scale system

When the weightlessness scale encounters a system failure, will you check and deal with it? The editor of Guangdong kenweigh has compiled this article on how to check and handle when the weightlessness scale system encounters a failure. I believe you will improve your ability to solve the failure of the weightlessness scale system after reading it. Diagnosis method of sensor failure When a weightless scale system fails, first determine whether it is a host failure or a sensor failure. The method is: (1) Troubleshoot the metering system. Check whether the suspension of the scale body is normal, whether the sensor, metering bin, and unloading electric vibrator are disconnected, stuck or supported, whether the feeding electric vibrator is pressed on the measuring bin, and whether the signal line from the sensor to the amplifier is disconnected. , If the above phenomenon occurs, it should be corrected and repaired first; (2) Determine whether it is a host failure. Swap the faulty input signal (the signal input plug behind the main box) with any normal signal. For example, if the fault is the first channel, it can be interchanged with the second or third input plug. If the fault turns to the new one after replacement, and the fault returns to the first one after recovery, it can be judged that the fault is a sensor fault, otherwise it is a host input fault; (3) Remove the signal line fault. The method is to check whether there is an open circuit or short circuit fault in the signal line from the amplifier to the host; (4) Determine whether the amplifier is faulty. Troubleshoot by replacing the faulty amplifier with a normal amplifier. The troubleshooting method of the sensor damage fault is checked according to the above steps, if the fault still exists, then it can be concluded that the sensor is faulty. Since the weightlessness scale uses 3 sensors, even if it is judged that the sensor is faulty, it is necessary to further investigate which one is damaged. The commonly used method is: (1) Hand pull. Pull the hook under each sensor separately by hand (don't pull the metering compartment), and use a multimeter to measure the output voltage of each sensor amplified by the amplifier (the red is positive at the output of the amplifier, and the black is negative) to see if the output voltage increases. If the voltage does not change, the sensor has been damaged. But sometimes after the sensor is pulled by hand, although the output voltage value is increased, it is still not enough to judge whether the sensor is damaged or not because of the uneven force of the hand. At this time, a more detailed investigation is required; (2) Hanging weights ( Or heavy objects). Hang the same weight or weight (for example, 5 kg) of appropriate mass on the hook under the sensor, and measure the output voltage of the amplifier with a multimeter. The output voltage value of a normal sensor is basically the same when subjected to the same gravity. When the output voltage value of a certain sensor is significantly greater or less than the output voltage value of other sensors, it can be concluded that the sensor has been damaged; (3) Measuring sensor The input and output resistance of the sensor are compared with the parameter values u200bu200bon the sensor factory inspection report sheet, so as to judge the quality of the sensor. In order to ensure the accuracy of sensor fault diagnosis, the above three methods can be used at the same time.