Electronic hoisting scales, automobile floor scales, electronic forklift scales, special-function electronic scales, and maintenance of electronic floor scales
The fault diagnosis and analysis of the weighing instrument maintenance sensor is used. The fault phenomenon of the automatic weighing instrument is always displayed in the terminal display instrument of the system. After the phenomenon of the failure phenomenon, do not blindly disassemble the load cell, and it should be first judged that the fault is from Which part of the measurement system. You can take the following approach:
Open the middle junction box and use the universal meter to check the working status of each sensor to determine if a sensor is faulty. Use the above method to narrow down the fault, find out the fault sensor and understand the operating condition of the fault in time and perform fault diagnosis. Therefore, the failure caused by the sensor is often related to the illegal operation or abnormal mechanical device;
Check the mounting status of the load cell mechanism;
Eliminate mechanical problems Check the cable for damage by using a rocker.
Weighing instrument sensor usage characteristics and fault occurrence:
Ambient temperature has different effects on different levels of load cells. The temperature environment of the sensor at the site of use is very different from that at the verification operation. Therefore, when the user finds excessive temperature drift of the sensor during use, measures should be taken to create a local relatively constant temperature environment around the sensor.
Zero point change due to overload and offset. In use, if the force application plane is not parallel to the support base surface, the partial load condition will be poor. Overloading or eccentric loading will cause a large plastic deformation of a certain part of the elastomer, and the zero point will suddenly become larger. If the local stress exceeds the strength limit, the sensor will be damaged.
Zero point change from electromagnetic interference. If a sudden impact or change in the field electromagnetic field is used, a considerable amount of induced potential is ignited in the bridge network or the signal transmission line, causing fluctuations in the sensor output.
Weighing instrument sensor precautions:
The screen cover and the housing are grounded to ensure that the sensor itself has a stable zero potential;
The weighing platform shall not place heavy objects for a long time to prevent the sensor from undergoing transmutation;
Should always check whether there is any phenomenon of disregarding the system;
The earth potential of the ground should take into account the changes in the load of the electrical equipment and the effects of lightning.
Matching principle of weighing sensor and weighing instrument
Weighing equipment, whether scales or platform scales, crane scales, sorting scales, packaging scales, etc., are ultimately due to the weighing sensor and the weighing instrument. What is the relationship between the weighing sensor and the instrument? Xiao Bian introduces the matching formula of the weighing sensor and the instrument.
Load cell and weighing instrument matching formula:
Load cell output sensitivity * Excitation supply voltage * Maximum weighing capacity
The number of scales * Number of sensors * Sensor range
For example: a weighing package weighing 50kg, the maximum number of divisions is 1000 divisions; scale body uses 3 Z6FC3/50kg sensor, measuring range is 50kg, sensitivity is 2.0±0.008mV/V, arch bridge voltage is 12V; scale Use AED9101C meter. Q. Can the sensor be matched with the meter?
Solution: After consulting, the input sensitivity of the AED9101C meter is 0.8μV/d. Therefore, according to the matching formula of the load cell and the meter, the actual input signal of the meter can be obtained as follows: 2&Times;12&Times;50/1000&Times;3&Times;25=16μV/d >0.8μv/d
Therefore, the load cell used meets the input sensitivity requirements of the instrument and can match the selected instrument.
From the above, we can see that the relationship between the load cell and the instrument is very close. If the match is not appropriate, it will directly affect the use of the entire device. Therefore, if we want to replace the load cell or instrument, we must The original factory is the best replacement, can not go to the original manufacturer to change, when the replacement must also choose the best match
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