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What is the check method for the faulty sensor of the multihead weigher system?

2022/09/19

Author: Smartweigh–Multihead Weighter

Do you check and handle when the multihead weigher encounters a system failure? The editor of Zhongshan Smart weigh has compiled this article on how to check and deal with the failure of the multihead weigher system. I believe that after reading it, your ability to solve the failure of the multihead weigher system will be improved. The diagnosis method of sensor failure When the multihead weigher system fails, it is necessary to first judge whether it is the host failure or the sensor failure. The methods are: (1) Troubleshoot the measurement system.

Check whether the suspension of the scale body is normal, whether the sensor, the measuring bin, and the feeding electro-vibrator are disconnected, stuck or supported, whether the feeding electro-vibrator is pressed on the measuring bin, and whether the signal line from the sensor to the amplifier is open-circuited. , If the above phenomenon 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 path, it can be interchanged with the second or third input plug. If the fault turns to the new one after the replacement, and the fault returns to the first one after the restoration, it can be judged that the fault is the sensor fault, otherwise it is the host input fault; (3) Eliminate 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 it is an amplifier fault. Troubleshoot by replacing the faulty amplifier with a normal amplifier. The troubleshooting method of the sensor damage fault After checking according to the above steps, if the fault still exists, then it can be concluded that it is the sensor fault.

Since the multihead weigher uses 3 sensors, even if it is judged that the sensor is faulty, it is necessary to further investigate which one is damaged. The method usually used is: (1) Hand pull. Pull the hooks under each sensor by hand (do not pull the metering compartment), and use a multimeter to measure the output voltage of each sensor amplified by the amplifier (the red output of the amplifier is positive, and the black is negative) to see if the output voltage increases.

If the voltage does not change, the sensor is damaged. But sometimes after pulling the sensor by hand, although the output voltage value increases, it is still not enough to judge whether the sensor is damaged or not because of the uneven force of the hand. or heavy objects). Hang the same weight or weight (eg 5 kg) of appropriate mass on the hook under the sensor while measuring the output voltage of the amplifier with a multimeter.

The output voltage value of a normal sensor is basically the same when it is subjected to the same gravity. When the output voltage value of a sensor is significantly larger or smaller 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 ​​on the sensor's factory inspection report, 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 simultaneously.

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